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Valeri Aronov


Last seen: 10 Monate ago Active since 2021

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How to loosen equation constaints in my fmincon process?
My objective function (including analytical gradients) and equality constaints are a bit too bulky to present them here. I sta...

10 Monate ago | 1 answer | 0

1

answer

Question


Matrix-vector operations without loops
How do I do this without loops: HessW = rand(length(x), length(x), length(f)); GradW = rand(length(x), length(f)); A = zeros(...

12 Monate ago | 2 answers | 0

2

answers

Answered
reshape() error in the function created by matlabFunction()
The error is known to MATLAB and will be fixed in the future

etwa ein Jahr ago | 0

| accepted

Answered
What is missing from MATLAB #2 - the next decade edition
Your TypicalX option for fminunc() (and others?) should be extended beyond usage for gradient evaluation only. I have used norm...

etwa ein Jahr ago | 0

Question


Rewriting code without loops
I have the following sizes of arrays of doubles: dev 101x1 GradW 4x101 HessW 4x4x101 The...

etwa ein Jahr ago | 1 answer | 0

1

answer

Question


How to rewrite my code without loops?
How to rewrite this code without loops: Grad = zeros(size(x)); for i=1:length(x) for j=1:l...

etwa ein Jahr ago | 1 answer | 0

1

answer

Question


reshape() error in the function created by matlabFunction()
matlabFunction() has generated for me AmplAndDers() to be used in fminunc(). The very first objective function evaluation fails...

etwa ein Jahr ago | 2 answers | 0

2

answers

Question


Unrecognized function or variable 'datachk'?
Soryy for the long Description. I have prepared a target function for optimization and am using it to build contours for now. He...

etwa ein Jahr ago | 1 answer | 0

1

answer

Question


Populating 2D meshgrid of a function of four variables
I have a function: function [y, Grad, Hess] = Target(x) ... end; where x's size is 4 (a vector of 4 variables)....

etwa ein Jahr ago | 1 answer | 0

1

answer

Question


Replacing function variables with a vector before taking a gradient
I have a symbolic function: A = 1/((C1*C2*R1*R2*w^2 - 1)^2 + w^2*(C2*R1 + C2*R2)^2)^(1/2) I would like to replace C1, C2, R1, ...

etwa ein Jahr ago | 1 answer | 0

1

answer

Question


Can I substitute a particular expression?
subexpr() discovers a common subexpression and rewrites a symbolic expression in terms of the found subexpression. How can I sim...

etwa ein Jahr ago | 1 answer | 0

1

answer

Question


How to rewrite my expression using two abbreviations?
I tried Rewrite Expression Using Abbreviations example in https://au.mathworks.com/help/symbolic/subexpr.html for subexpr() and...

etwa ein Jahr ago | 1 answer | 0

1

answer

Question


How to get rid of sign() in diff() results?
I have a symbolic function. diff() produces the result with sign(). The next derivative has dirac() in it. Is there a way to g...

mehr als ein Jahr ago | 2 answers | 0

2

answers

Question


Using Hessian for least squares problem
It looks like lsqnonlin() from MatLab can't make use of a Hessian (it is not stated explicitly by MatLab, but I read this in the...

mehr als ein Jahr ago | 1 answer | 0

1

answer

Question


How do I plot a symbolic function of one variable for a specific set of argument values?
Say, I have a symbolic function y(x). There is no support for plotting it when x=logspace(1, 5, 101) in fplot(). How do I do it ...

mehr als ein Jahr ago | 1 answer | 0

1

answer

Question


Where is surf() result?
Can't see the plot even in the documentation example: [X,Y] = meshgrid(-2:.2:2); Z = X .* exp(...

mehr als ein Jahr ago | 0 answers | 0

0

answers

Question


confusing error message: 'Not enough input arguments'?
Having: function [f] = Simple(x) f = (x(1)-1).^2 + (x(2)-1).^2; end and running: x = lsqnonlin(Simple, [2.0, 2.0]) I am g...

mehr als ein Jahr ago | 1 answer | 0

1

answer