How to randomly extract 10 elements from that matrix

i generate 1000*1 matrix through 'A=rand(100,1)'. And now i want to randomly extract 10 elements from that matrix.

How can i get that?!

Answer 1

[Dyuman Joshi]

A = rand(1000,1);
%10 random indices less than or equal to the number of elements in A
idx = randperm(numel(A),10)

idx = 1×10

178 548 432 843 471 260 520 944 697 282

out = A(idx)

out = 10×1

0.3810 0.0216 0.9089 0.3924 0.5069 0.7092 0.2685 0.4270 0.0852 0.3132

[Yoon Ju]

Oh i got it-! thank you so much But i couldn't get how 'out' return that elements. Is 'out' a function?

[Dyuman Joshi]

"out" is just the variable to which I have assigned the output. You can change the name of the output as per what you want.