How to draw samples using the code 'X = uq_getSample(300)'?

After i construct an INPUT object, samples cannot be drawn using ‘X = uq_getSample(300)’, only a matrix of X is shown. How to draw samples using this code? Thanks.

Dear @Major_Hou

Using this command, you get a set of 300 samples arranged in a matrix with 300 lines.
Each line is an independent sample of your INPUT random vector.
Best regards

Dear Professor Sudret,
Thank you very much for your reply. I think i get to know this command according to your comments.
Student: Lam
Best regards