generate unique random matrix using key

i want to get a key(integers/character/string) from the user and generate a random matrix using that key and particular to that key only. meaning if i again use that key for generating a matrix i would get similar matrix.matrix should be having unit8 values less than 256.

[Jan]

How large is the key and the matrix?

[vardhit]

matrix can be as large as an image matrix can be.. i really dont have any idea about key..but if u ask me about the sample space of key.i want it to be from integer 1-100.or even a string.

Answer 1

[Azzi Abdelmalek]

key=3 % for example
rng(key)
out=uint8(randi([0 255],2,4) % matrix 2x4

[vardhit]

what is rng? its undefined in matlab.

[Azzi Abdelmalek]

Look at control random number generation

[vardhit]

??? Undefined function or method 'rng' for input arguments of type 'double'. it gives an error

[Azzi Abdelmalek]

In Matlab windows command, type

which rng

What did you get?

[vardhit]

'rng' not found.

[Azzi Abdelmalek]

I don't know if it's due to the version of your Matlab, or there is another problem. Maybe you should contact Mathworks technical support

[Walter Roberson]

rng is only defined in later versions of MATLAB. see http://www.mathworks.com/help/matlab/ref/randstream.html