creating matrix of 1 nd -1

how can i generate random matrix of 1 and -1 ...

thanks in advance

[Thomas]

Do you want the elements of the matrix to be only 1 and -1 or between 1 and -1

[umar siyab]

i want my matrix to be 1 and -1 and it should be 256 by 256 ... basically i want a pesudo random bit generator which can generate a matrix of 1 and -1

Answer 1

[Jan]

1 and -1:

x = 1 - (rand(3,5) > 0.5) *2;

From -1 to 1:

x = 1 - rand(3,5) *2;

[umar siyab]

thanks sir

and it really helped me..

Answer 2

[David Young]

Assuming that you want values of 1 and -1 only, you can do

2*randi(2, m, n) - 3

[umar siyab]

sorry it is undefined function in matlab i think ....m new to matlab so don'y know much about these fnction