find indices of elements in terms of another vector

Hi, I have two vectors that can be simplified as follows;

v1    v2
134  134
135  137
137
138
140

Now I would like to find the index of v2 in terms of v1, which results in as below:

v3
1
3
.
.
.

I tried to use find function, but I couldn't get it right. Can anyone help me to resolve it other than for loop? Thank you.

Minsoo

Answer 1

[Fangjun Jiang]

help ismember()

[Fangjun Jiang]

v1=[134 135 137 138 140]';

v2=[134 137]';

[TF,Index]=ismember(v2,v1)

Answer 2

[Paulo Silva]

m=[134  
135  
137
138
140]

n=[137
134]

[c ia ib]=intersect(m,n);
ia

You just want ia