# Valeri Aronov

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**Content Feed**

Question

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...

ungefär ett år ago | 1 answer | 0

### 1

answerQuestion

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(...

ungefär ett år ago | 2 answers | 0

### 2

answersreshape() error in the function created by matlabFunction()

The error is known to MATLAB and will be fixed in the future

mer än ett år ago | 0

| accepted

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...

mer än ett år ago | 0

Question

Rewriting code without loops

I have the following sizes of arrays of doubles: dev 101x1 GradW 4x101 HessW 4x4x101 The...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

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...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

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...

mer än ett år ago | 2 answers | 0

### 2

answersQuestion

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...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

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)....

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

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, ...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

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...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

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...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

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...

mer än ett år ago | 2 answers | 0

### 2

answersQuestion

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...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

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 ...

mer än ett år ago | 1 answer | 0

### 1

answerQuestion

Where is surf() result?

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

mer än ett år ago | 0 answers | 0

### 0

answersQuestion

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...

nästan 2 år ago | 1 answer | 0