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prod!

prod!(r, A)

Multiply elements of A over the singleton dimensions of r, and write results to r.

Examples

julia> r = [1, 1, 1];
julia> A = [2, 3, 4];
julia> prod!(r, A)
3-element Array{Int64,1}:
  2
  3
  4

This example multiplies the elements of array A over the singleton dimensions of array r and assigns the results to r.

julia> r = [1, 1, 1];
julia> A = [2 3 4];
julia> prod!(r, A)
3-element Array{Int64,1}:
  24
   1
   1

In this example, A is a matrix with dimensions (1, 3). The prod! function multiplies the elements of A along the singleton dimension and stores the results in r.

julia> r = [1, 1];
julia> A = [2, 3, 4];
julia> prod!(r, A)
2-element Array{Int64,1}:
  6
  4

Here, A is a 1-dimensional array of length 3. The prod! function multiplies the elements of A and stores the results in r.

Common mistake example:

julia> r = [1, 1, 1];
julia> A = [2, 3, 4, 5];
julia> prod!(r, A)
ERROR: DimensionMismatch("arrays could not be broadcast to a common size")

In this example, the dimensions of r and A do not match, causing a DimensionMismatch error. Ensure that the dimensions of the input arrays are compatible to avoid such errors when using prod!.

See Also

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