How to randomly select an element in adjacent entries in a matrix in for loop
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here's my code:
% code
for j=1:tmax
for i=1:n
if mat(i)==0 && rand() < r*(1-(zerfre)^2);
idx = 1 + fix(rand(1,1)*numel(mat));
mat(i)=mat(idx);
elseif mat(i)==1 && rand() < r*(1-(onefre)^2);
idx = 1 + fix(rand(1,1)*numel(mat));
mat(i)= mat(idx);
elseif mat(i)==2 && rand() < r*(1-(twofre)^2);
idx = 1 + fix(rand(1,1)*numel(mat));
mat(i)= mat(idx);
elseif mat(i)==3 && rand() < r*(1-(thrfre)^2);
idx = 1 + fix(rand(1,1)*numel(mat));
mat(i)= mat(idx);
elseif mat(i)==4 && rand() < r*(1-(foufre)^2);
idx = 1 + fix(rand(1,1)*numel(mat));
mat(i)= mat(idx);
elseif mat(i)==5 && rand() < r*(1-(fivfre)^2);
idx = 1 + fix(rand(1,1)*numel(mat));
mat(i)= mat(idx);
end
last=mat;
end
% code
Basically I'm updating my initial matrix mat with probability rules. What the rule does is, with some probability, it's replacing the entry with another entry that's randomly selected from the rest of the entire matrix.
Instead of this, I need to randomly select an element from an adjacent neighbourhood of entries, then replace the old entry with that.
By adjacent I mean within the closest 10*10 entries.
How would I do this?
Thanks a lot for your help!
4 Comments
Image Analyst
on 3 Apr 2013
If I'm processing element 85 and I want to replace it with some other element from 75 to 95, taken at random, then what does it matter if mat(85) is 3 or 1 or pi or 42 or whatever? Who cares what it is? Yet you check for it.
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