Did anyone use "x = lsqnonneg(C,d,options)" function mathematically?

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Riyadh Muttaleb 2016-5-7

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评论： Walter Roberson 2017-5-4

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 2016-5-8

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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