i have 4 columns of (256x4 double) type.
1 view (last 30 days)
Show older comments
mania online
on 1 Mar 2016
Commented: Roger Stafford
on 3 Mar 2016
I want to add column 1 with 3 and column 4 with 2 and need to store results in two columns. In first column it should save the result of 1 and 3 and in second column it should save 2 and 4 result. one more thing i want to add column 1 with 3 randomly.Like 1st index of column 1 need to add with any index of column 3. i don't want to add these columns with similar index
0 Comments
Accepted Answer
Roger Stafford
on 1 Mar 2016
B = A(:,1:2)+A(:,3:4);
15 Comments
Roger Stafford
on 3 Mar 2016
I interpret your statement "add column 1 with 3 randomly.Like 1st index of column 1 need to add with any index of column 3. i don't want to add these columns with similar index" to mean that you seek a random permutation of column 3 which at no position from 1 to 256 does the permuted index value agree with the original position index value. For columns of length 256 the while-loop in the code below will probably require an average of two to four repetitions. If you wish the same action for columns 2 and 4, the following code can easily be modified to do that.
n = size(A,1);
b = true;
while b
p = randperm(n);
b = any(p==(1:n));
end
B(:,1) = A(:,1) + A(p,3);
More Answers (0)
See Also
Categories
Find more on Creating and Concatenating Matrices 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!