MATLAB: Summation in a for loop without cumulitive

loopsum

I have a very simple question.

I want to summate the variable A for a certain interval + and – B.

for i=(b+1):length((a)-b)

C(i) = sum(a(i-b):(i+b));

end

This loop works, however the output that I get is a cumulative sum of all the previous. So I get an exponential increase. However I would like to just have the sum over the interval -b:b for all values of i. So no cummulation.

Best Answer

 C(i) = sum( a([i-b]:[i+b]) )

That puts into C(i), the sum of the (i-b)th index of a, to the (i+b)th index of a.

What you had, put into C(i), the sum of the (i-b)th index of a to (i+b)

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MATLAB: Avoiding for loop

And another solution:

A = [1 2 3 4 5]';
B = [4 5 6 2 1]';
index     = B > A;
C(index)  = B(index)  + A(index);
nindex    = ~index;
C(nindex) = B(nindex) - A(nindex);

And another one:

f = 2 * (B > A) - 1;
C = B + f .* A;

MATLAB: Calling variables from other functions

Simply write these command to a script or function:

C = myAND(A, B);
Untitled3(A, B, C);

Best Answer

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MATLAB: Avoiding for loop

MATLAB: Calling variables from other functions

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