Limiting vectors to a certain number of rows

Hi, i have created a function that creates n lots of a matrix of 3 columns but different number of rows. How do i limit the number of rows so that each of this matrixes has say 4 rows?

Answer 1

[Wayne King]

It depends which 4 rows you want to choose out of each of the matrices. Do you always want the first 4 rows?

If so, then in your code after you create the matrix, remove the trailing rows.

   X = randn(10,10);
   X(5:end,:) = [];

[Giovanni]

thanks man yeah i want the first 4 rows of each, what does the randn(10,10) command do?

[Walter Roberson]

randn(10,10) creates some random sample data to illustrate the solution.