create a matrix based on a row distribution

Hello,

Please help me with the following.

Consider a 100x10 matrix A and a 15x10 matrix B.

We also have a distribution i=1,2,...,15 of the rows of A.

For example,

A=[row1;row2;...;row100];

The distribution of the 15 values is random:

distr=[6;14;...;2];

The distr vector is 100x1.

How can we replace the corresponding rows of B to A, based on the distribution?

The new matrix A, called A_new, is also 100x10 and should like this:

A_new=[B(6,:);B(14,:);...;B(2,:)];

The A_new rows are the corresponding rows of B based on the distribution.

Thank you very much.

Best,

Pavlos

Answer 1

[Roger Stafford]

 A_new = B(distr,:);