Failure in initial objective function evaluation. LSQNONLIN cannot continue.
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I am getting the LSQNONLIN error and I am hoping that someone can take a look at my objective function. I am sure I have written it completely wrong.
x will be an input vector of [rx ry rz mx my mz]. And what I would like to get out of this are the optimized values for [rx ry rz mx my mz].
G_measured calls a function that takes in a vector called Rmeasured and dipoleMoment and spits out data of 4x6 vector (4 measurement points measuring G elements), same with G_estimate.
Any help or guidance would be appreciated as I am fairly new to this.
options = optimoptions(@lsqnonlin);
options.Display = 'iter';
options.Algorithm = 'levenberg-marquardt';
options.StepTolerance = 1e-6;
options.MaxFunctionEvaluations = 1000;
x = lsqnonlin(@lm_obj,x_init, [],[],options)
x_init = [1, 3, 5, 10, 0, 10]
function F = lm_obj(x)
G_estimate = getGradientsEstimate(x);
G_measured = getGradientsMeasured(Rmeasured, dipoleMoment)
Difference = G_estimate - G_measured;
F = norm(Difference)
end
3 Comments
Ameer Hamza
on 5 Sep 2020
getGradientsEstimate() needs 3 input variables, whereas you are only passing in one variable. I guess the vector x_init combines the value of sensorLoc, targetLoc, and dipoleMoment, but you need to split x vector into 3 variables and then pass it to these functions.
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