Cumsum function + range of values after cumsum.

    A   0 0 0 1 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 ..... 0   0   1    0  0  0  0  1 0 0 1 0 1 ....
cumsum  0 0 0 1 1 1 2 2 2 2 2 3 3 3 3 3 4 4 4 ..... 159 159 160  0  0  0  0  1 1 1 2 2 3 ....
Delete  0 0 0 1 0 0 2 0 0 0 0 3 0 0 0 0 4 0 0 ..... 0   0   160  0  0  0  0  1 0 0 2 0 3 ....

Ex) When the vaule 'Delete' = 160, I'd like to reset counter 160 -> 1.

for i=1:n;
cumsum=cumsum(A);      => some codes should be added to reset...;;
 if A(i,1)==A(i+1,1);
    0=Delete(i+1,1);
 end
end

Thank you.

Answer 1

[Andrei Bobrov]

cmsum0 = cumsum(A);
cmsum = rem(cmsum0-1,160)+1;
delte = A;
t = A > 0;
delte(t) = cmsum(t);

[the cyclist]

This method retains multiple instances of 160 in cmsum beyond the first one, which it seems he did not want.

[Andrei Bobrov]

other variant:

cmsum = cumsum(A);
t = cmsum > 160;
cmsum(t) = cmsum(t) - 160;
delte = cmsum.*A;

[the cyclist]

Two comments on this variant:

• I don't think it addresses the reoccurrences of exactly 160 that I mentioned in an earlier comment.
• You might need to do the "subtract 160" step multiple times, if the cumsum could results in values greater than 320, 480, 640, etc. This is easily done via a while loop.

Answer 2

[the cyclist]

I think this does what you want. I changed the name of your cumsum variable to c. It's bad practice (and confusing) to name a variable that same as a MATLAB function.

A = [0 0 0 1 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 156  0  0  0  0  1  0  0 1 0 1];  
n = numel(A);

c = cumsum(A);
reset = 160;
for i = 2:n
    if (c(i) > reset+1) || (c(i-1)==reset && c(i)==reset)
        c(i:end) = c(i:end) - reset;
    end
end

Delete = c;

Delete([false diff(c)==0]) = 0;