error using rand function in matlab

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while running following snippet matlab code

file_name='B.bmp';
key=double(imread(file_name))./256;

rand('state',key);

following error was thrown by matlab:

??? Error using ==> rand
State must be a double scalar.

can anyone please help me on this i am new to matlab.

Posted 1-Apr-12 6:10am

Updated 1-Apr-12 6:37am

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Sergey Alexandrovich Kryukov 1-Apr-12 13:05pm

Wow! What was your idea behind the string 'state'? :-)
--SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-04-01T07:03:00

This is explained here:
http://www.mathworks.com/help/techdoc/math/brnuahp.html[^],
http://www.mathworks.com/help/techdoc/math/bruv81b.html[^].

You are doing something weird: instead of passing two integers (please see the second of the pages referenced above, with samples), you pass the string 'state'. I cannot even imagine what did you mean by that… :-)

—SA