lsqnonneg function without constraints

2015 11 12
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lsqnonneg function of MATLAB helps to find value of x that minimizes norm of|C*x - d| subject to x >= 0. However, I want to find value of x that minimizes norm of|C*x - d| without any constraints. Is there some function in MATLAB to do so?

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John D'Errico
John D'Errico 2015-11-12

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Um, zillions of them?
lsqcov, regress, fit, lsqlin, lsqr, and that ignores all the nonlinear iterative solvers.
Turns out the most trivial, is just
x = C\d;

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