How can I keep just the arrays with 2 is before 3 after random swap 2 numbers.
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with: s=[1,2,3,4,5];
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Jan
2019-4-17
编辑:Jan
2019-4-17
s = [1,2,3,4,5];
s = s(randperm(numel(s))); % Random permutation?
% Or swap 2 elements:
index = randperm(numel(s), 2);
s(index) = s(flip(index));
s(s == 2 | s == 3) = [2, 3]; % Re-order the elements 2 and 3
4 个评论
Jan
2019-4-19
This is not useful:
for i=1:5
ind1=find(s(:,:)==2);
ind2=find(s(:,:)==3);
end
The body of the loop is calculated 5 times with identical values. You can omit the loop:
ind1=find(s(:,:)==2);
ind2=find(s(:,:)==3);
But you can omit this test completely. This is sufficient for all cases:
s(s == 2 | s == 3) = [2, 3];
Why do you use L-1 in randi([1 L-1],1) ? I assume you want L instead.
更多回答(1 个)
Raj
2019-4-17
Try this:
s=[1,2,3,4,5]
%First random swap
x=randi([1,4],1,1);
if s(x)~=2
s([x x+1])= s([x+1 x]);
else
s([x x-1])=s([x-1 x]);
end
disp('After first random swap s=')
disp(s);
%second random swap
y=randi([1,4],1,1);
if s(y)~=2
s([y y+1])= s([y+1 y]);
else
%Do nothing
end
disp('After second random swap s=')
disp(s);
There may be better and optimized way of doing this also but this also works!
另请参阅
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