Access the array index using find

Hello ,

I have an array A1 = [1 12 23 45]; and

second array A1_1 = [45 23];

I need to find the index of 45 and 23 in first array A1. I am using following function to do this find(a==a_1(1)) --Output =4 find(a==a_1(2)) --Output =3 I want to get this for multiple elements of array .

It would be grateful if you let me know the changes that are to be done to get it for multiple elements in an array.

Looking forward to hear from you at the earliest.

Thanks Pankaja

Answer 1

[Azzi Abdelmalek]

a= [1 12 23 45];
b= [45 23]
out=arrayfun(@(x) find(a==x),b,'un',0)

Or using a for loop. The previous answer, also uses a loop.

for k=1:numel(b)
  out{k}=find(a==b(k));
end

Answer 2

[Titus Edelhofer]

Hi,

I guess you are looking for this:

 A1 = [1 12 23 45];
A1_1 = [45 23];
[~,idx] = ismember(A1_1, A1)
idx =
     4     3

Titus

[Azzi Abdelmalek]

What if A1 = [1 12 45 23 45]?

[Titus Edelhofer]

Yes, you are right. In this case you would find only the first of the two 45 ...