create an array

2011 6 30
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I wonder how I can make an array (200,400) with values 0 to 7 which randomly distributed? I apperciate your help.

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Andrei Bobrov
Andrei Bobrov 2011-6-30

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rand(200,400)*7

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Hassan
Hassan 2011-6-30
thanks Andrei. I wonder how I can group each value in the array. for eaxmple (1:20,1:20)=1,(40:70,40:70)=2 and so on.
Hassan
Hassan 2011-6-30
thanks but can you please show it with an example?

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Sean de Wolski
Sean de Wolski 2011-6-30

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szs = [20 20 30]; %sizes
vals = [1 0 2]; %values
C = cellfun(@(c,v)ones(c)*v,num2cell(szs),num2cell(vals),'uni',false);
M = blkdiag(C{:});

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Andrei Bobrov
Andrei Bobrov 2011-6-30
like
C = arrayfun(@(i1)ones(szs(i1))*vals(i1),1:3,'un',0);
Sean de Wolski
Sean de Wolski 2011-6-30
Nicer!
I don't think I've ever used arrayfun()
Hassan
Hassan 2011-6-30
thanks a lot Sean and Andrei.

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