How to find location of elements in an array

I have 2 vectors 'A' of size 41*1 and 'B' of size 14*1

vector 'B' contains selected elements from vector 'A'. how do I find the position of elements present in vector 'b' in vector 'a'?

Example: A=1:1:100

B=2:2:20

Now I want to find the position of elements of B in A.

I tried find function but it throws dimention error.

Thanks in Advance

Answer 1

[KALYAN ACHARJYA]

idx=find(ismember(A,B))

[Praanesh Sambath]

this dosent return the position. just says if it is present or not

[Stephen23]

As logical indices:

idx = ismember(A,B)

As linear indices:

[~,idy] = ismember(B,A)

[KALYAN ACHARJYA]

Edited see the answer, idx=find(ismember(A,B))

[KALYAN ACHARJYA]

Yes, thank you Stephen Cobeldick sir

[Praanesh Sambath]

Thanks it worked

Answer 2

[Kanupriya Singh]

Try this-

a = [2 1 3 4 6 8]
b = [2 6 8]
idx = [];
for i = 1:length(b)
    idx = [idx, find(b(i) == a)];
end

[Stephen23]

Rather complex... one ismember call is much simpler (and is what most MATLAB users would do).

[Praanesh Sambath]

I get this error

error: horizontal dimensions mismatch (0x2 vs 1x1)

>> idx

idx = [](0x2)