Subtracting elements with constraints

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Nikolas Spiliopoulos
评论： Nikolas Spiliopoulos 2017-2-27
Hi all,
I have an array A and I need to subtract the elements of each column using the cumsum function:
B=bsxfun(@minus, A(1,:), cumsum(A(2:end,:)));
However I have some constraints that should not violated (min=1.3, max=11.7) Is there any way to do the calculations within these limits?
thanks
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Guillaume
Guillaume 2017-2-27
编辑：Guillaume 2017-2-27
What does "constraints that should not be violated" actually mean. What should happen to avoid violating these constraints?
Nikolas Spiliopoulos
Nikolas Spiliopoulos 2017-2-27
If the constraints are violated it just put the maximum or minimum value respectively! If it's within the range it does the calculations.

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Stephen23
Stephen23 2017-2-27
编辑：Stephen23 2017-2-27
Your question is not clear where you want these constraints applied.
Option one: constrain output values:
B = bsxfun(@minus, A(1,:), cumsum(A(2:end,:)));
B = max(1.3, min(11.7, B));
Options two: constrain cumsum values:
tmp = max(1.3, min(11.7, cumsum(A(2:end,:))));
B = bsxfun(@minus, A(1,:), tmp);
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Walter Roberson
Walter Roberson 2017-2-27
Another possibility: that at each point the sum needs to be in that range, and if adding the next element would move it out of the range then clamp it at the edge of the range, but allow the next element to move it away from the edge of the range. For example, if the lower limit was 1, then for
A = 6 2 2 2 2 -3
cummulative
C = 4 2 1 1 4
^ ^
the clamping has been applied at the ^ points, but no history of how far outside the range it would go, so the -(-3) moves it 3 away from the bottom of the range
I am not sure at the moment that a vectorized version of this approach is possible.
Nikolas Spiliopoulos
Nikolas Spiliopoulos 2017-2-27
thanks a lot, I want to constrain the output values!

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