create an array

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

Answer 1

[Andrei Bobrov]

rand(200,400)*7

[Hassan]

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]

thanks but can you please show it with an example?

Answer 2

[Sean de Wolski]

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{:});

[Andrei Bobrov]

like

C = arrayfun(@(i1)ones(szs(i1))*vals(i1),1:3,'un',0);

[Sean de Wolski]

Nicer!

I don't think I've ever used arrayfun()

[Hassan]

thanks a lot Sean and Andrei.