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
function find_common(a,b)
a = reshape(a,length(a),1);
b = reshape(b,1,length(b));
la = length(a);
lb = length(b);
a = a[:,ones(1,lb)];
b = b[ones(la,1),:];
comab = find(x->x==true,a .== b);
comab = comab.';
coma = mod(comab+la-1,la)+1;
comb = floor(Int64,(comab+la-1)/la);
return coma,comb;
end
So coma and comb is exactly what I want. In matlab this is easy to do. But
with julia, I haven't thought of a clever answer yet.
In matlab we can simply get coma and comb by [coma, comb] = find(a==b).
在 2016年7月5日星期二 UTC+9下午7:02:34，Fred写道：
>
> 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 écrit :
>>
>> But intersect doesn't tell us the index of the elements in the
>> matrix(array), I think.
>>
>
