Did anyone use "x = lsqnonneg(C,d,options)" function mathematically?
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Riyadh Muttaleb
on 7 May 2016
Commented: Walter Roberson
on 4 May 2017
I have trouble with use "x = lsqnonneg(C,d,options)" mathematically especially "options" ... options = optimset('param1',value1,'param2',value2,...)
Thanks in advance
Riyadh
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Walter Roberson
on 8 May 2016
The only options accepted for lsqnonneg are listed at http://www.mathworks.com/help/matlab/ref/optimset.html as Display and TolX. Display has no effect on the calculation. TolX is described http://www.mathworks.com/help/matlab/math/setting-options.html#bt00l89-1
"TolX is a lower bound on the size of a step, meaning the norm of (xi – xi+1). If the solver attempts to take a step that is smaller than TolX, the iterations end."
Mathematics might be infinitely precise in theory, but reaching infinite precision can take an infinite amount of time, and the user might not need that precision. Besides, double precision cannot distinguish more than one part in 2^53; see http://www.mathworks.com/help/matlab/ref/eps.html
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Walter Roberson
on 4 May 2017
You appear to be discussing this with John over in https://www.mathworks.com/matlabcentral/answers/338575-how-can-i-calculate-the-confidence-interval-for-lsqnonneg-regression
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