Change of sign in a matrix one by one
2 views (last 30 days)
Show older comments
Hi to all the users. I have a matrix A = ones(5), I want to change the sign of elements one by one but under the condition with rand(1).
Pick random position 1 in A then take rand_number = rand(1) if rand_number>=0.5 fix that 1 to -1
else 1 remains 1 then again pick 1 from the remaining 1s in the matrix A continue till all ones go to -1
Hope i have explained well.
Regards
0 Comments
Answers (1)
KSSV
on 28 Nov 2016
Edited: KSSV
on 28 Nov 2016
A = ones(5) ;
Ac = A(:) ;
pos = 1:length(Ac) ;
for i = 1:length(pos)
rand_pos = randsample(pos,1) ;
if rand(1) > 0.5
Ac(rand_pos) = -1 ;
end
pos = setdiff(pos,rand_pos) ;
end
A = reshape(Ac,5,5) ;
3 Comments
KSSV
on 28 Nov 2016
A = ones(5) ;
Ac = A(:) ;
pos = 1:length(Ac) ;
while ~isempty(pos)
rand_pos = randsample(pos,1) ;
if rand(1) > 0.5
Ac(rand_pos) = -1 ;
pos = setdiff(pos,rand_pos) ;
end
end
A = reshape(Ac,5,5) ;
See Also
Categories
Find more on Logical in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!