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# Julia vector to matrix

### Multi-dimensional Arrays · The Julia Languag

1. An inefficient way to do this would be to replicate the vector to the size of the matrix: julia> a = rand(2,1); A = rand(2,3); julia> repeat(a,1,3)+A 2×3 Array{Float64,2}: 1.20813 1.82068 1.25387 1.56851 1.86401 1.6784
2. julia> hcat (matrix, [9 9]) ERROR: number of rows must match in hcat at abstractarray.jl:571. vcat. Vertical concat. Stacks two or more matrices, on top of each other: julia> matrix = [1 2 3; 4 5 6] 2x3 Array{Int64,2}: 1 2 3 4 5 6 julia> vcat(matrix, [9 9 9]) 3x3 Array{Int64,2}: 1 2 3 4 5 6 9 9 9
3. julia> A = [1 0; 0 -1] 2×2 Matrix{Int64}: 1 0 0 -1 julia> B = [0 1; 1 0] 2×2 Matrix{Int64}: 0 1 1 0 julia> F = eigen(A, B) GeneralizedEigen{ComplexF64, ComplexF64, Matrix{ComplexF64}, Vector{ComplexF64}} values: 2-element Vector{ComplexF64}: 0.0 - 1.0im 0.0 + 1.0im vectors: 2×2 Matrix{ComplexF64}: 0.0+1.0im 0.0-1.0im -1.0+0.0im -1.0-0.0im julia> F.values 2-element Vector{ComplexF64}: 0.0 - 1.0im 0.0 + 1.0im julia> F.vectors 2×2 Matrix{ComplexF64}: 0.0+1.0im 0.0-1.0im -1.0+0.0im -1.0-0.

Matrices I matrices in Julia are repersented by 2D arrays I [2 -4 8.2; -5.5 3.5 63] creates the 2 3 matrix A= 2 4 8:2 5:5 3:5 63 I spaces separate entries in a row; semicolons separate rows I size(A) returns the size of A as a pair, i.e., A_rows, A_cols = size(A) # or # A_rows is size(A), A_cols is size(A) I row vectors are 1 nmatrices, e.g., [4 8.7 -9] function toMatrix{T<:Any}(x::Vector{Vector{T}}, dim::Int=1) if length(x) == 0 return(Array(T, 0, 0)) else N = length(x) M = length(x) if dim == 1 xMat = Array(T, N, M) for m = 1:M if length(x[m]) != N error(Conversion not possible due to vector length mismatch) end for n = 1:N xMat[n, m] = x[m][n] end end elseif dim == 2 xMat = Array(T, M, N) for m = 1:M if length(x[m]) != N error(Conversion not possible due to vector length mismatch) end for n = 1:N xMat[m, n] = x[m][n.

It would be much better simply to use slices of your matrix i.e. instead of A1 use A[:,1] and instead of A2 use A[:,2] If you really need them to be seperate objections you could try creating a cell array like so: myfirstcell = cell(size(A,2)) for i in 1:size(A,2) myfirstcell[i] = A[:,i] en Julia has a system for promoting arguments of mathematical operators to a common type, which has been mentioned in various other sections, including Integers and Floating-Point Numbers, Mathematical Operations and Elementary Functions, Types, and Methods. In this section, we explain how this promotion system works, as well as how to extend it to new types and apply it to functions besides built-in mathematical operators. Traditionally, programming languages fall into two camps with respect. julia> A = zeros(2,3) 2×3 Matrix{Float64}: 0.0 0.0 0.0 0.0 0.0 0.0 julia> fill!(A, 2.) 2×3 Matrix{Float64}: 2.0 2.0 2.0 2.0 2.0 2.0 julia> a = [1, 1, 1]; A = fill!(Vector{Vector{Int}}(undef, 3), a); a = 2; A 3-element Vector{Vector{Int64}}: [2, 1, 1] [2, 1, 1] [2, 1, 1] julia> x = 0; f() = (global x += 1; x); fill!(Vector{Int}(undef, 3), f()) 3-element Vector{Int64}: 1 1 Vectors I vectors are represented by arrays in Julia I to create the 3-vector x = (8; 4;3:5) = 2 4 8 4 3:5 3 5 use x = [8, -4, 3.5] (x = [8;-4;3.5] also works) I watch out for similar looking expressions { (8,-4,3.5) and [8 -4 3.5] are not equivalent in Julia I length of a vector: length(x) Vectors

### Basic Vector and Matrix Operations in Julia: Quick

• julia> Vector[rand(3), rand(3), rand(3)] 3-element Array{Array{T,1},1}: [0.08082297930289717,0.4831571293164978,0.7227686419871842] [0.7376841239302636,0.6150435898281146,0.1474762464521686] [0.9699744293150396,0.19770809574045556,0.638619038137211] julia> hcat(ans...) 3x3 Array{Float64,2}: 0.080823 0.737684 0.969974 0.483157 0.615044 0.197708 0.722769 0.147476 0.638619 However, if you are worried about performance then creating an array of the right size and filling it in a loop.
• However, vectors also support additional operations. First, note that Vector{T} where T is some type means the same as Array{T,1}. julia> Vector{Int} Array{Int64,1} julia> Vector{Float64} Array{Float64,1} One reads Array{Int64,1} as one-dimensional array of Int64. Unlike multi-dimensional arrays, vectors can be resized. Elements can be added or removed from the front or back of the vector. These operations are al
• For example, to construct a sparse matrix we can input a vector I of row indices, a vector J of column indices, and a vector V of stored values (this is also known as the COO (coordinate) format). sparse (I,J,V) then constructs a sparse matrix such that S [I [k], J [k]] = V [k]
• How to create a Julia array with the numbers in a given range? If you want a Julia array with all the numbers from 1 to 10: collect(1:10) We get: 10-element Array{Int64,1}: 1 2 3 4 5 6 7 8 9 10 (Yes, I specially designed this website so the above would look like The Matrix.
• For example, vector'vector yielding a vector (#2472, #2936), vector' yielding a matrix, and vector'' yielding a matrix (#2686) are all bad mathematics. What works for me mathematically (which avoids introducing a new type) is that for a 1-dimensional Vector v: v' is a no-op (i.e. just returns v), v'v or v'*v is a scalar An array can also be reshaped — here I'm creating an array with elements from 1 to 10, both included, and reshaping them into a matrix of 2 rows and 5 columns: Flattening You can flatten n*m matrix into a column vector easily — this will have so many use cases later when covering data science The vec() is an inbuilt function in julia which is used to reshape the specified array as a one-dimensional column vector i.e, 1D array. Syntax: vec(a::AbstractArray Matrices in Julia are the heterogeneous type of containers and hence, they can hold elements of any data type. It is not mandatory to define the data type of a matrix before assigning the elements to the matrix. Julia automatically decides the data type of the matrix by analyzing the values assigned to it. Because of the ordered nature of a matrix, it makes it easier to perform operations on.

In Julia, arrays are actually mutable type collections which are used for lists, vectors, tables, and matrices. That is why the values of arrays in Julia can be modified with the use of certain pre-defined keywords. With the help of push! command you can add new element in array Julia is a high performance, dynamic programming language that has a high-level syntax.It is free for everyone to use and easy to learn. Julia is used generally for data analysis and visualization purposes. A grid that contains objects in multiple dimensions is called a Multi-dimensional Array julia-lang documentation: Concatenation. Example. It is often useful to build matrices out of smaller matrices. Horizontal Concatenatio change Vector{UInt8}(::String) so that it performs a copy; change String(::Vector{UInt8}) so that it performs a copy; define two new functions performing unsafe conversions between String and Vector{UInt8}; the proposed names are unsafe_string_to_array and unsafe_array_to_string. If the above are agreed I can make an appropriate PR

Exercises: https://drive.google.com/file/d/1ZL9ipNQPaOlAfB1ymPdhpT-i0QQ7Oe9f/view?usp=sharing Julia manual on arrays: https://docs.julialang.org/en/v1/manual.. Vectors and Matrices The code after the equals sign tells Julia what the output of the function is. The second method is used to create functions of more than one line. The name of the function, fun, is specified right after function, and like the one-line version, has its arguments in parentheses. The return statement specifies the output of the function. foo = x-> x + 3. Defines an. Matrices I matrices in Julia are repersented by 2D arrays I to create the 2 3 matrix A= 2 4 8:2 5:5 3:5 63 use A = [2 -4 8.2; -5.5 3.5 63] I semicolons delimit rows; spaces delimit entries in a row I size(A) returns the size of A as a pair, i.e., A_rows, A_cols = size(A) # or A_size = size(A) # A_rows is A_size, A_cols is A_size I row vectors are 1 nmatrices, e.g., [4 8.7 -9] Matrices 3. Convert Array{Tuple} to Matrix. Hi, How to convert: 1000-element Array{Tuple{Integer,Integer,Integer},1}: (10,2,1) (5,7,10) (5,7,4) (1,1,6) (2,3,6) (8,6,4) (10,2,4) Julia Programming Language › Julia Users. Search everywhere only in this topic Advanced Search. Convert Array{Tuple} to Matrix ‹ Previous Topic Next Topic › Classic List: Threaded ♦ ♦ 11 messages Júlio Hoffimann. Nicht, dass Matrix erstellt ein zweidimensionales array bei Julia? Wenn Sie versuchen, mit m =[0, 3], erstellt eine eindimensionale Vector für Sie ist, können Sie fügen es durch [m; v].. Ich denke, mit [m v] ist, erstellen Sie ein zweidimensionales array, aus dem Julia-Dokumen StaticArrays. Statically sized arrays for Julia. StaticArrays provides a framework for implementing statically sized arrays in Julia, using the abstract type StaticArray{Size,T,N} <: AbstractArray{T,N}.Subtypes of StaticArray will provide fast implementations of common array and linear algebra operations. Note that here statically sized means that the size can be determined from the type.

### Linear Algebra · The Julia Languag

Julia: Transforming an Array of Arrays in a 2-dimensional Array , julia> d 99-element Array{Array{Float64,1},1}: I'm trying to convert it into a 2- dimensional Array, and I sucessfully achieved my goal with: data As you noted, you can concatenate an array of arrays x using hcat(x Julia comprehension: convert a 2d array of matrices to a 2d matrix. 8. Get Type in Array The reverse() is an inbuilt function in julia which is used to reverse the specified vector v from start to stop.. Syntax: reverse(v, start, stop) or reverse(A; dims::Integer) Parameters: v: Specified vector. start: Specified starting value. stop: Specified stopping value. A: Specified array. dims::Integer: Specified dimensions. Returns: It returns a reversed copy of the vector Is there anything wrong with adding the following constructor method to convert the above vector to a matrix. Base.Matrix(v::Vector{SVector{S, T}}) where {S, T} = reduce(hcat, v) and using. m = Matrix(x) mT = transpose(Matrix(x)) to get the vector as a matrix and matrix transpose? (EDIT: Yes, because it creates a copy it is not efficient Hi, Julia beginner here. I have a huge array with strings inside. And I want to add some suffixes like .1 then .2. for duplicated entry. So from an array A like this 2 1 Vectors julia> a = [ 1 2 ] 1×2 Matrix{Int64}: 1 2 julia> b = (1, 2) (1, 2) Hereaisarowvector,whichwewillencounterlater;bisatupleorlistconsisting oftwoscalars Matrices I matrices in Julia are repersented by 2D arrays I to create the 2 3 matrix A= 2 4 8:2 5:5 3:5 63 use A = [2 -4 8.2; -5.5 3.5 63] I semicolons delimit rows; spaces delimit entries in a row I size(A) returns the size of A as a pair, i.e., A_rows, A_cols = size(A) # or A_size = size(A) # A_rows is A_size, A_cols is A_size[2

Speci c vectors concept mathematical notation Julia syntax zero vector 0 n or (more commonly) just 0. zeros(n). ones vector 1 n or 1. ones(n). unit vectors e i = (0;:::;0;1;0;:::;0) (ith entry is one). No built-in Julia syntax for unit vectors. The following code cre-ates e i: # create zero vector ei = zeros(n) # set i-th entry to 1 ei[i] = Julia - Transform a matrix to a vector. JKHA Published at Dev. 12. JKHA. Appart from allocating a new vector and filling its values one by one with the one of my matrix, how would I resize / refill a matrix of size n x m to a vector of size n x m generalizing the following example: julia> example_matrix = [i+j for i in 1:3, j in 1:4] 3×4 Array. Julia R; Create a row vector: A = [1 2 3] A = c(1,2,3) Create a column vector: A = [1 2 3]' A = matrix(c(1,2,3),3,1) Create integers from j to n with step size k: A = j:k:n A = seq(j,n,k) Create linearly spaced vector of k points: A = linspace(1, 5, k) A = seq(0, 1, length.out = 10 That's not an array, that's an array of a scalar and a matrix. Something like. Float64.(vcat(T, vec(T))) could work. You may want to read the manual, these kind of data manipulations are very basic and it will be frustrating to use Julia without being aware of them

With these functions, you can often avoid having to write custom kernels. For example, to perform simple element-wise operations you can use map or broadcast: julia> a = CuArray {Float32} (undef, (1,2)); julia> a .= 5 1×2 CuArray {Float32,2}: 5.0 5.0 julia> map (sin, a) 1×2 CuArray {Float32,2}: -0.958924 -0.958924 3D rotations made easy in Julia. This package implements various 3D rotation parameterizations and defines conversions between them. At their heart, each rotation parameterization is a 3×3 unitary (orthogonal) matrix (based on the StaticArrays.jl package), and acts to rotate a 3-vector about the origin through matrix-vector multiplication Here is an example of creating an array and accessing a subset of it in Julia. Notice that Julia has 1-based indices, meaning first element is at index 1. julia> a = [2, 4, 6, 8] julia> a[2:4]..

### How to convert Array{Array{Float64, 1}, 1} to Matrix in julia

1. Here, collect just takes our range operator and evaluates it to an array. julia> fizzbuzz(5) 5-element Array{Int64,1}: 1 2 3 4 5 Adding Fizzes. This works. Let's see if we can print Fizz for each number that's divisible by 3. We can do this by replacing all numbers that are divisible by 3 with a Fizz string
2. Julia has a feature called broadcasting which makes it easy to apply a function to one or more arrays with a concise dot syntax: f. (a, b) means apply f elementwise to a and b . Here's a quick visualization of the way a 2-dimensional broadcast operation works on a column vector a and row vector b. a = [2, 3, 4, 5] b = [6 7 8 9
3. Kronecker tensor product of two vectors or two matrices. Example. julia> A = [1 2; 3 4] 2×2 Array{Int64,2}: 1 2 3 4 julia> B = [im 1; 1 -im] 2×2 Array{Complex{Int64},2}: 0+1im 1+0im 1+0im 0-1im julia> kron(A, B) 4×4 Array{Complex{Int64},2}: 0+1im 1+0im 0+2im 2+0im 1+0im 0-1im 2+0im 0-2im 0+3im 3+0im 0+4im 4+0im 3+0im 0-3im 4+0im 0-4i Above code generates an error when we try to push a float value in an Integer typed Array. This shows that Julia is strictly typed and doesn't allow pushing elements of any other data type. Changing Data type of an Array: Julia by default doesn't change the type of an Array and hence it doesn't allow pushing differently typed value in the array. This can be avoided with the use of external packages Array{T}(dims) Array{T,N}(dims) Construct an uninitialized N-dimensional dense array with element type T, where N is determined from the length or number of dims.dims may be a tuple or a series of integer arguments corresponding to the lengths in each dimension. If the rank N is supplied explicitly as in Array{T,N}(dims), then it must match the length or number of dims Julia's parser provides convenient dispatch to specialized methods for the transpose of a matrix left-divided by a vector, or for the various combinations of transpose operations in matrix-matrix solutions. Many of these are further specialized for certain special matrix types. For example   ### julia - How to convert a Matrix into a Vector of Vectors

Vectorization has two different meanings in Julia, both related to operating on chunks of data: Writing your code in terms of operations that operate on whole arrays. For example, writing d=a+b-c where the variables all indicate array objects. See the Julia @devec package for more information about this style of code The reverse() is an inbuilt function in julia which is used to reverse the specified vector v from start to stop. Syntax: reverse(v, start, stop) or reverse(A; dims::Integer) Parameters: v: Specified vector. start: Specified starting value. stop: Specified stopping value. A: Specified array. dims::Integer: Specified dimensions Julia's compiler uses type inference and generates optimized code for scalar array indexing, allowing programs to be written in a style that is convenient and readable, without sacrificing performance, and using less memory at times. In Julia, all arguments to functions are passed by reference. Some technical computing languages pass arrays by value, and this is convenient in many cases. In Julia, modifications made to input arrays within a function will be visible in the parent function. Note that in Julia the indexing starts from 1, so if you want to access the first element of an array you'll do A. Matrix - Another data structure that is widely used in linear algebra, it can be thought of as a multidimensional array. Here are some basic operations that can be performed in a matrix ; Dictionary - D ictionary is an unordered set of key: value pairs, with the.

### Conversion and Promotion · The Julia Languag

julia> array = Int[1,2,3] map(x -> x * 2, array) 3-element Array{Int64,1}: 2 4 6 julia> map((x) -> x^3, [1 2 3]) 1x3 Array{Int64,2}: 1 8 27 julia> function Foo(x,y) return 2(x+y) end julia> map(Foo, [1 2 3], ones(1, 3)) 1x3 Array{Float64,2}: 4.0 6.0 8. Sparse Vectors and Matrices. Julia has built-in support for sparse vectors and sparse matrices. Sparse arrays are arrays that contain enough zeros that storing them in a special data structure leads to savings in space and execution time, compared to dense arrays. Compressed Sparse Column (CSC) Sparse Matrix Storage . In Julia, sparse matrices are stored in the Compressed Sparse Column (CSC.

### Arrays · The Julia Languag

A Computer Science portal for geeks. It contains well written, well thought and well explained computer science and programming articles, quizzes and practice/competitive programming/company interview Questions The output tells us that the arrays are of types Array{Int64,1} and Array{Float64,1} respectively.. Here Int64 and Float64 are types for the elements inferred by the compiler.. We'll talk more about types later. The 1 in Array{Int64,1} and Array{Any,1} indicates that the array is one dimensional (i.e., a Vector).. This is the default for many Julia functions that create array Matrix operations: using arrays as matrices Edit. In Julia, a 2-D array can be used as a matrix. All the functions available for working on arrays can be used (if the dimensions and contents permit) as matrices. A quick way of typing a matrix is to separate the elements using spaces (to make rows) and to use semicolons to separate the rows. So Julia has decided that even if the length of one dimension of a multidimensional array is 1, the array still doesn't change type. This means a 1x3x3 tensor, even though it is equivalent to a 3x3 matrix, is still of type Array{Int64, 3}. This also means that a 1x3 matrix, even though it is equivalent to a row vector, is still of type Array{Int64, 2}

### Julia Users - vector of vectors to arra

Examples. julia> foo = ; julia> append! (foo, [2,3]); # contrast with push! julia> foo 3-element Array {Int64,1}: 1 2 3. julia> a= [1, 2, 3] b = [4, 5, 6] append! (a,b) 6-element Array {Int64,1}: 1 2 3 4 5 6 Drop matrix dims according to `MATLAB` convention. - scalar: scalar instead of 1x1 matrix - rvector: vector instead of 1xN matrix - cvector: vector instead of Nx1 matrix dropmatdim! (x;scalar = true, rvector = true, cvector = true) = x function dropmatdim! (x:: Dict;scalar = true, rvector = true, cvector = true) foreach (k-> x[k] = dropmatdim Sparse Matrices in Julia. Julia supports sparse matrices in the SparseMatrixCSC type. It uses the CSC format, and the datatype Tv for the non-zeros and all indices Ti can optionally be specified, SparseMatrixCSC{Tv,Ti}.. Some special sparse matrices can be created using the following functions (together with their dense equivalents) Julia's Array. 174 likes · 10 talking about this · 1 was here. Offers items from crafts/home decor to essential oil products. Offering Ladies Craft Nights at your home or business, as well as craft..

### Julia Language - Vectors julia-lang Tutoria

Julia is a language that turns this dream into a reality. With Julia, you can focus on your problem, keep your codes clean, and more importantly, write fast codes without diving into lower level languages such as C or Fortran even when performance is critical. However, you should not take this potential speed for granted. To get your codes fast. Julia does not treat arrays in any special way. The array library is implemented almost completely in Julia itself, and derives its performance from the compiler, just like any other code written in Julia. An array is a collection of objects stored in a multi-dimensional grid. In the most general case, an array may contain objects of type Any Create a Triangular Matrix from a Vector performing sequential operations r,for-loop,matrix,vector,conditional I have been trying to solve the following problem. Suppose I have the following vector: aux1<-c(0,0,0,4,5,0,7,0,0,10,11,12) where the numbers represent the number of the row. I want to calculate the distance between the differents. Julia Array is on Facebook. Join Facebook to connect with Julia Array and others you may know. Facebook gives people the power to share and makes the world more open and connected

### Sparse Arrays · The Julia Languag

There are times when it is necessary to extract particular elements from a 2D array. This is especially relevant in image processing using filters which are not square or rectangular in shape. For instance consider the following circular filter with a diameter of 11. 0 0 0 1 1 1 1 1 0 0 julia> using LinearAlgebra julia> Matrix{Float64}(I, 2, 2) 2×2 Array{Float64,2}: 1.0 0.0 0.0 1.0 julia> using SparseArrays julia> sparse([1.0, 0.0, 1.0]) 3-element SparseArrays.SparseVector{Float64,Int64} with 2 stored entries:  = 1.0  = 1.0 5. Share. Report Save. level 2 . 2 years ago. Matrix{Float64}(I, 2, 2) I understand the need for the type information, but that is such an ugly. The type of this array is Array{Any,1}, where Any means the compiler has determined that any valid Julia type can be added to the array. While occasionally useful, this is to be avoided whenever possible in performance sensitive code. The other place this can come up is in the declaration of functions. As an example, consider a function which returns different types depending on the arguments. Learn Julia with our free tutorials and guide

### Julia arrays: How to add, delete, and replace item

Assume a vector that contains n*(n+1)/2 elements. The aim is to pack these The aim is to pack these elements into the diagonal and upper right triangular portion of an n* This allows vectors to be indexed like one-column matrices, for example: julia> A = [8,6,7] 3-element Array{Int64,1}: 8 6 7 julia> A[2,1] 6 迭代. 迭代整个数组的推荐方法是. for a in A # Do something with the element a end for i in eachindex(A) # Do something with i and/or A[i] end. 当你需要每个元素的值而不是索引时，使用第一个构造。 在第二个构造中. Example Basic Syntax. Julia's array comprehensions use the following syntax: [expression for element = iterable] Note that as with for loops, all of =, in, and ∈ are accepted for the comprehension.. This is roughly equivalent to creating an empty array and using a for loop to push! items to it.. result = [] for element in iterable push!(result, expression) en Julia is a new homoiconic functional language focused on technical computing. While having the full power of homoiconic macros, first-class functions, and low-level control, Julia is as easy to learn and use as Python. This is based on Julia version 1.0.0. # Single line comments start with a hash (pound) symbol. #= Multiline comments can be written by putting '#=' before the text and. variable anscombe is to copy/paste, convert an array, then rename the column names, like this: julia> anscombe = DataFrame( [10 10 10 8 8.04 9.14 7.46 6.58 Either by passing an array of symbols as colnames, or by passing header=false (in which case you will get auto created colnames) Best, David

### Taking vector transposes seriously · Issue #4774

Ordinary vectorized code is fast, but not as fast as a hand-written loop (assuming loops are efficiently compiled, as in Julia) because each vectorized operation generates a new temporary array and executes a separate loop, leading to a lot of overhead when multiple vectorized operations are combined.. The dots allow Julia to recognize the vectorized nature of the operations at a syntactic. The base array type in Julia is the abstract type AbstractArray{T,N}. The Array type is a specific instance of DenseArray Vector and Matrix are aliases for the 1-d and 2-d cases. Very few operations are implemented specifically for Array beyond those that are required for all AbstractArrayss; much of the array library is implemented in a generic manner that allows all custom arrays to.  We have only created a custom array. We have not changed the behaviour of Julia. for j in 0:(size(array)*cycle_count)-1 # Print the element at the j%size th position. This is what gives us the. In this tutorial, you'll learn how to convert a Julia string to an array. Converting string to array is a common programming question in many programming languages. While getting started with Julia this was something I learnt first while learning Julia. Define a Function In Julia Let's start by defining a function in Julia which reads a string as paramter. function JuliaStringToArray(input. Julia For Loop Julia for loop is used to iterate a set of statements over a range of elements, or items of an array, etc. In this Julia Tutorial, we will learn how to write For Loop in Julia programs with examples. The syntax of For loop in Julia is where for, in and end are keywords. x is the item of the range or collection for each iteration 10 votes, 10 comments. I'm excited about Julia 1.0 so as a newbie I'm experimenting with it. In python, or R for that matter, I can take the mean of Manipulating Vectors and Matrices How to manipulate vectors and matrices in Julia and R? The following table translates the most common Julia commands into R language. Julia R Transpose Complex conjugate transpose Concatenate horizontally Concatenate vertically Reshape (to 5 rows, 2 columns) Convert matrix to vector Repeat matrix (3 times in the row dimension, In Julia, a vector can be represented as a one dimensional Array. Julia Arrays allow us to express scalar multiplication and addition with a very natural syntax. In : x = ones (3) Out: 3-element Array{Float64,1}: 1.0 1.0 1.0. In : y = [2, 4, 6] Out: 3-element Array{Int64,1}: 2 4 6. In : x + y. Out: 3-element Array{Float64,1}: 3.0 5.0 7.0. In : 4 x # equivalent to 4 * x and.

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