Use `enumerate`:
julia> a = [1,3,5,8]
julia> b = [1,2,5,7]
julia> intersect(enumerate(a), enumerate(b))
2-element Array{Tuple{Int64,Int64},1}:
(1,1)
(3,5)
On July 5, 2016 at 13:20:15, siyu song (siyuphs...@gmail.com) wrote:
Good to know this method. Thanks a lot.
在 2016年7月6日星期三
Good to know this method. Thanks a lot.
在 2016年7月6日星期三 UTC+9上午1:45:21，Cedric St-Jean写道：
>
> In Julia, if speed isn't too important, this gives the same results:
>
> a, b = [-1,-2,-3], [-3,-4,-5,-2]
> inter = intersect(a, b)
> (Int[findfirst(a, x) for x in inter], Int[findfirst(b, x) for x in
In Julia, if speed isn't too important, this gives the same results:
a, b = [-1,-2,-3], [-3,-4,-5,-2]
inter = intersect(a, b)
(Int[findfirst(a, x) for x in inter], Int[findfirst(b, x) for x in inter])
And it should be a good deal faster than the MATLABism. Other functions you
might find useful:
Thanks, Fred, for your answer. But in fact I want to know the index of the
common elements of two integer vectors(Elements are all different in each
vectors).
For example, v1 = [1,2,3] and v2[3,4,5,2]. So the answer should be
common_index1 = [2,3], common_index2 = [1,4].
I use a function as
julia> a=[1,3,5,7]
4-element Array{Int64,1}:
1
3
5
7
julia> b=[2,3,5,6,7]
5-element Array{Int64,1}:
2
3
5
6
7
julia> intersect(a,b)
3-element Array{Int64,1}:
3
5
7
julia> union(a,b)
6-element Array{Int64,1}:
1
3
5
7
2
6
Le lundi 4 juillet 2016 04:18:10 UTC+2, siyu song a
Oh you are right. ".==" works very well. I don't know this before. I am
still a newcomer here. Thank you very much.
在 2016年7月4日星期一 UTC+9上午11:35:10，Cedric St-Jean写道：
>
> Maybe I'm missing something, but doesn't find(Mat_a .== Mat_b) work as in
> Matlab? (Julia needs the dot before the ==)
>
> On
Maybe I'm missing something, but doesn't find(Mat_a .== Mat_b) work as in
Matlab? (Julia needs the dot before the ==)
On Sunday, July 3, 2016 at 10:18:10 PM UTC-4, siyu song wrote:
>
> But intersect doesn't tell us the index of the elements in the
> matrix(array), I think.
> 在 2016年7月4日星期一
intersect(a,b)
union(a,b)
Le dimanche 3 juillet 2016 19:54:02 UTC+2, siyu song a écrit :
>
> In MATLAB, it's easy to do this by using : find(Mat_a == Mat_b). Is there
> an easy similar way to do this?
>
