Finding the indices of the elements of one array in another

i have matrix a:

1

2

3

i have matrix b:

1

2

4

and finally matrix c:

3

5

7

i 'm going to find the indices of common contents of a and b, and create a new matrix with the contents of matrix c that are in the same indices that i found between a and b, in another words 1 and two are the common contents in a and b, their indices are 1 and 2, i'm going to shape a new matrix whit the indices 1 and 2 in from matrix c, which are 3 and 5. i wrote the following code but i can not complete that:

f=find(ismember(a,b)) ind=find(f) i dont know what should i write in next steps

Answer 1

[Thomas]

f=find(ismember(a,b))

output=c(f)  % members in c having index of commons in a and b

[babak]

thank you tom

[Sean de Wolski]

out = c(ismember(a,b)); %skip the find!