edit-selecting random values

I have a 10x10 matrix,i need 3 x10 ,but the corresponging column values must not change

if u r selecting any elememt from ist row that corresponging column values must not change

Answer 1

[Andrei Bobrov]

EDIT [09:13(UTC+4) 13.01.2012]

A = randi(48,10)

s = size(A);
n = [3 10];
q = reshape(1:numel(A),s(1),[]);
rc = s - n + 1;
m = q(1:rc(1),1:rc(2));
I = randperm(numel(m));
p = m(I(1));
out = A(rem(p-1,s(1))+(1:n(1)),ceil(p/s(1))+(0:n(2)-1))

[kash]

andrei i get error

Error using ==> randperm

Too many input arguments.

Error in ==> Untitled2 at 7

p = m(randperm(numel(m),1));

[Andrei Bobrov]

corrected

[Walter Roberson]

That code *is* syntactically correct; see http://www.mathworks.com/help/techdoc/ref/randperm.html

p = randperm(n,k) returns a row vector containing k unique integers selected randomly from 1 to n inclusive.

If you receive an error at that line, it suggests that your version of MATLAB predates that facility.

I do not understand andrei's code at the moment, so I cannot say whether that was the syntax he intended to use.

[kash]

thanks andrei,i did not get as i desired,ur output is continious 3 rows, but i neeed as distinct values...i.e

for ex first row values

38

10

19

that is i dont need continuous values,please help

[Andrei Bobrov]

two last rows of my code

p = m(I(1:n(1)));

out = A(p,ceil(p(1)/s(1))+(0:n(2)-1))

Answer 2

[Walter Roberson]

It looks to me as if the answer should just be

p = randperm(size(A,1));
out = A(p(1:3),:);

[kash]

thanks walter ,this is answer am looking for