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Constraint set to be a real number
First, constraints like: AV_constraint_1 = isreal(A_v); are not differentiable. Sorry. They can't be used in fmincon. Well, y...

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Numerical integration (Trapezoid, Simpson, Gauss)
"shouldn't Gauss' 3 points method give the best value for the integral ?" Why? In fact, no. There is no reason for that to be t...

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Why does MatLab give non integer values for whole numbers?
It is not even remotely ridiculous. Are you seriously claiming that the vector [0.7071;0.7071] is NOT a null vector? Any mult...

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Does anyone know how to get solve to work with one of the variables being a range
Solve does not directly allow you to define a variable as being in a range, but assume will help you out, as I show below. Anywa...

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Algorithm which finds lower bound of the epigraph of a discrete 2D curve which is not a function (i.e. fails vertical line test)
Is there an algorithm that solves it in some slick way? Not that I know of. How would I solve it? Treat this as a way to find ...

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Simplify in GF(2)
In the help docs for simplify, we see: "S = simplify(expr) performs algebraic simplification of expr." The key word there is A...

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Hello I am solving a lp problem and linprog shows the wrong answer. If I solve it with fmincon, I get the answer.
H= @(i,j) exp(-abs(i-j)); % anonymous function m= 4; noise_pow= 1e-9; g= [15; 12; 9; 6]; A= [-H(1,1), g(1)*H(2,1), g(1)*H(3,1...

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Cumtrapz integration drift with time
This is expected behavior. And reducing the time step WILL reduce the problem. And it IS something purely mathematical, yes, you...

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Numerical search for the singular points of a complex matrix
I'm sorry, but the use of det for anything like this is a bad idea. How did they do this in 1972? Sigh, they used determinants ...

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Vectorized code slower than loops
Read the response by @Steven Lord again, in case you missed it. (Actually, that is always good advice for any of his responses.)...

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How to use "predict" to get x value for a given y value?
Huh? Of course polyfit works. It does NOT require the x values be distinct. I'm not at all sure why you think that is necessary....

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What information is stored by p1/p2/... in this code sample?
Undocumented, uncommented code, from an unknown source? Shiver. No. It is not a distance computation. That much I can say. The...

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Attempt to execute SCRIPT plot as a function,how to solve it?
Don't name your script plot. In general, don't use existing names of supplied functions for your own functions or scripts. You ...

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How to identify such functions as addpath that are coming with MATLAB?
Follow two rules when you are writing or providing functions to run in MATLAB. Rule # 1: NEVER put your own functions in the Ma...

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Are there MATLAB functions or scripts to perform boolean operations on triangulated solids?
Are there such codes in MATLAB? Yes. I wrote them. intersect, union. In 2-d and in 3-d. (Not sure if I wrote a setdiff variant. ...

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Product of matrices over finite fields
Even in the simple case of F_2 matrices, I'm not sure it is easy to do better than brute force. But no, you don't need to write ...

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Multi-Parameter function minimization with many many parameters
Let me try to help, a little at least. Why is fminsearch so bad at high dimensions? It is just not designed for that class of ...

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Solve nlp equation system with variables spanning more than 40 powers of 10
Are the variables potentially going to vary by that many powers of 10? If so, then you would have the solver work in a log space...

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Solve 𝑔 ′ ( 𝑥 ) = 0 for z in terms of N, a positive integer
First, it is not a cubic equation! Yes, you can replace sqrt(x) with a new variable z, thus a transformation. But doing so can ...

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With k（0<k<0.5） and u（-1<u<1) as independent variables and x and y as dependent variables, how do you graph x and y, respectively, for a system of implicit function equations?
You have 2 parameters, k and u. If you were to fix those parameters, then you could solve for the solutions. There would be zero...

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4 nonlinear equations by using Newton's method
Why are you writing Newton's method code to solve a problem? Never write code to do numerical methods work, if far better code i...

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Is there a function in matlab to find temperature, density ecc.. values outside the standard atmposphere?
Um, not really, and certainly not easily or in any good way. Something like temperature can vary HUGELY outside the atmosphere,...

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Issue regarding the result from symbolic computation
If you have this: a11 = 1/2; a12 = 1/2; a22 = 1/2; A = [a11 a12 0; a12 a22 0; 0 0 0] The eigenvectors were found as: [V,D] =...

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Calculating Perpendicular Distance Between Detected Edge and Smoothing Function
If your curve is represented as a sequence of points (which is always possible) then you can use my distance2curve utility. It f...

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How to draw the function relationship graph between two or three variables, where these variables are solved by a system of equations.
Not everything you might want to do has an answer. You ask to "draw" the relationship between variables. (For a fairly vaguely s...

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How to create a smooth curve through data points?
Just coming back to this, as I did not see the data provided. (Sorry to @Gerard Feeney) But this is a difficult thing for multi...

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Is it possible to select the parameters in the approximation equation using MATLAB?
Yes. Use the curve fitting toolbox. help fittype help fit Note that the estimates of these coefficients will be very uncertai...

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HI, while doing a small calculation part, from my class note, in matlab, im getting the result as inf, can i know how to convert the inf value into realnumbers.
Of course D0 is undefined. You created the variable Do. There is a difference between the number 0 and the letter o. That Do is...

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Need help with curve fitting
Um. NO. Yes, there is a language problem, and what you write is confusing. But you are not doing what you claim to want to do. W...

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solving a nonlinear equation with complex numbers
syms R positive % positive implicitly implies real also syms X real syms Zo Z=(R*1i*X/(R+1i*X)); r=(Z-Zo)/(Z+Zo) r = simpli...

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