Select random numbers from a matrix

I want to select 100 random numbers from a certain column of a matrix. What should I do?

[James Tursa]

Provide a short example.

Answer 1

[Image Analyst]

Try this:

y = rand(1000, 3); % Some random data
% Select 100 numbers randomly from column 2:
selected = y(randperm(size(y, 1), 100), 2)

[Nishant Gupta]

thanks a lot

[Abdelrahman Mohamed]

thanks