edit-selecting random values

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kash
kash 2012-1-12
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

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Andrei Bobrov
Andrei Bobrov 2012-1-12
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))
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kash
kash 2012-1-13
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
Andrei Bobrov 2012-1-13
two last rows of my code
p = m(I(1:n(1)));
out = A(p,ceil(p(1)/s(1))+(0:n(2)-1))

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Walter Roberson
Walter Roberson 2012-1-13
It looks to me as if the answer should just be
p = randperm(size(A,1));
out = A(p(1:3),:);

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