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randn!

randn!([rng], A::Array{Float64,N})

Fill the array A with normally-distributed (mean 0, standard deviation 1) random numbers. Also see the rand function.

Examples

julia> rng = Random.MersenneTwister(1234);  # Optional: specify the random number generator
julia> arr = zeros(3, 2);
julia> randn!(rng, arr)
3×2 Array{Float64,2}:
  0.867347   0.972284
 -0.901042  -0.937167
 -0.494419  -0.767108

This example generates normally distributed random numbers using the randn! function and fills the array arr with the generated numbers.

julia> arr = [1.0, 2.0, 3.0, 4.0];
julia> randn!(arr)
4-element Array{Float64,1}:
  0.3718436994071754
 -1.6695509607077415
 -0.07698343753913995
  0.20169833389049528

In this example, the randn! function fills the given array arr with normally distributed random numbers.

Common mistakes:

julia> arr = [1, 2, 3];
julia> randn!(arr)
ERROR: MethodError: no method matching randn!(::Array{Int64,1})

The randn! function generates normally distributed random numbers, which are of type Float64. In this example, the array arr contains integers, and therefore, the function call results in a MethodError. Make sure the array type is compatible with the expected type for randn!.

See Also

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