randn

Hi

If we declare two rows of random numbers

x = randn(2,100)

and

then use a for loop to move the numbers

for k=1:10
x =  1 0  * x
     0 1
end for

This will spread the numbers from (0,0), right? But if I want the numbers to start from (10,10) and if they cross 20, reinitialize them again... is this possible?

If not with randn, can you suggest another solution?

[Jan]

Please post valid Matlab code to explain your problem. "for k=1:10 x = 1 0 * x 0 1 end for" is not clear.

What does "crossing 20" mathematically mean? The norm, the maximum, the minimum of the two components?

Answer 1

[Daniel Shub]

Your question is not really clear ... how about

x = mod(randn(2, 100)+10, 20)

You maybe you mean ...

x = 10*randn(2, 100)+10;
while any(x(:) > 20)
  x(x(:) > 20) = 10*randn(sum(x(:) > 20), 1)+10;
end