How to make cross-correlation matrix from 2 vectors of different length?

Hi everyone,

I have a problem with cross-correlation matrix, I hope to get your helps.

I have 2 vectors that are of different length. The size of A vector is 21*1 and B is 9*1

I need to make cross-correlation matrix betwwen 2 vectors.

How can I make this matrix?

I greatly appreciate every your comment or advice.

Thank you so much!

[José-Luis]

Is there a time-stamp associated to those vectors, or an x to their y values? Otherwise you can't.

[Chi Nguyen]

To Jose-Luis,

You are right. These vectors are associated with time-stamp.

You can talk in detail how I can make this matrix? Thank you so much!