how can i specify a parameter for each element of a random matrix?

i know the function a=randi([imin,imax],n,m) but in there imin and imax are parameters of the matrix in general, and i need to specify parameters of each element or each column of the matrix. HELP !!!!

[Walter Roberson]

rand([inmin, imax], n, m) is not valid. There is a randi() that uses that syntax: is that what you want? The code would be different for integers than for continous values because of boundary effects and the way rounding works.

[Eldha Perez]

yes i meant randi for integers values :)

Answer 1

[Roger Stafford]

Let Imin and Imax be n x m matrices in which Imin(i,j) is to be the lower limit for a(i,j) and Imax(i,j) its upper limit.

   a = ceil((Imax-Imin+1).*rand(n,m)+Imin-1);

I have assumed that you meant 'randi' in your description, and that you wish to generate integers.

Answer 2

[John BG]

Mr Stafford answer is correct,

yet

my reading of the question is that 'for each column' means Eldha only has 2 1xM vectors defining max and min, not an NxM matrix defining NxM ranges.

For instance let's say you want to generate 21 rows, and have 12 boundaries

% N: rows M: columns, for instance:
N=21
M=12

% v_max=[max1 max2 .. maxM]
% v_min=[min1 min2 .. minM]
% generating boundaries, change v_max v_min to required values

v_max=randi([10 20],1,M);v_min=randi([-20 10],1,M)

A=zeros(N,M)

for k=1:M
   A(:,k)=randi([v_min(k) v_max(k)],N,1)
end

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thanks in advance

John

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