i have a important question!! ( function "randfixedsum" )
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i successd in create matrix 'x' from "randfixedsum"
in here, 'x' is formed 'double'. and 'x' can recreate as integer by using "round", "ceil", or "floor"
by the way,
how to create 'x' by way for 'integer' by itself?
回答（2 个）
Roger Stafford
2017-3-28
I think you might prefer to use the following code rather than using randfixedsum and rounding to integers:
function R = randfixedsumint(m,n,S);
% This generates an m by n array R. Each row will sum to S, and
% all elements are all non-negative integers. The probabilities
% of each possible set of row elements are all equal.
% RAS - Mar. 4, 2017
if ceil(m)~=m|ceil(n)~=n|ceil(S)~=S|m<1|n<1|S<0
error('Improper arguments')
else
P = ones(S+1,n);
for in = n-1:-1:1
P(:,in) = cumsum(P(:,in+1));
end
R = zeros(m,n);
for im = 1:m
s = S;
for in = 1:n
R(im,in) = sum(P(s+1,in)*rand<=P(1:s,in));
s = s-R(im,in);
end
end
end
return
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2017-3-28
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