Location of minimum in Julia

Question

Does Julia have a build in command to find the index of the minimum of a vector? R, for example, has a which.min command (and a which.max, of course).

Obviously, I could write the following myself, but it would be nice not to have to.

function whichmin( x::Vector )
  i = 1
  min_x=minimum(x)
  while( x[i] > min_x ) 
    i+=1 
  end
  return i
end

Apologies if this has been asked before, but I couldn't find it. Thanks!

Answer 1

Since 0.7-alpha, indmin and indmax are deprecated. Use argmin and argmax instead.

For a vector it just returns the linear index

julia> x = rand(1:9, 4)
4-element Array{Int64,1}:
 9
 5
 8
 5

julia> argmin(x)
2

julia> argmax(x)
1

If looking for both the index and the value, use findmin and findmax.

For multidimensional array, all these functions return the CartesianIndex.

Answer 2

I believe indmax(itr) does what you want. From the julia documentation:

indmax(itr) → Integer

Returns the index of the maximum element in a collection.

And here's an example of it in use:

julia> x = [8, -4, 3.5]
julia> indmax(x)
1