find() function with user defined conditions

[abhijithch]

Hi, I am a MATLAB user, now trying out JULIA. So most of my issues are functionalities which are in MATLAB and it would be nice to have them in JULIA as well.
Is there any way I can do the find() on vectors or matrices with conditions other than just finding nonzeros.

If find(f,A) is meant for this, the documentation is not very clear about it.

[ihnorton]

Yes:

julia> a = [ 1 2 3 4 3 5 3 6 7 8 9 3 ]
julia> find( x->(x == 3), a)
4-element Array{Int64,1}:
  3
  5
  7
 12

[pao]

You don't need the lambda:

julia> a = [ 1 2 3 4 3 5 3 6 7 8 9 3 ]
1x12 Int64 Array:
 1  2  3  4  3  5  3  6  7  8  9  3
julia> find(a .== 3)
4-element Int64 Array:
  3
  5
  7
 12

[pao]

Also, it's worth mentioning we have an active mailing list/Google Group which is a perfect forum for questions like this at https://groups.google.com/forum/#!forum/julia-users, which I encourage you to check out!