Answered
Install 2 instances of Matlab on the same PC
Yes, and no. I frequently have several old versions of MATLAB on my computer. Walter has many as I recall. The only issue is if ...

12 days ago | 0

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Answered
Is there any method to calculate the inverse of matrix which changed a few values?
Bruno is correct in how to solve the problem, and also SOME of the issues with it. If you use this tool multiple times, the floa...

12 days ago | 0

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Answered
wrong differential equation solution
Sorry. I don't know what you did incorrectly, but here is what I see. syms y(t) yalpha = (1/80)*(36*exp(-t) + 125*sin(t) -3*...

12 days ago | 1

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Answered
How to limit calculation precision?
There are only two standard choices in MATLAB for floating point computations, and two ways to get round the problem. That is,...

13 days ago | 1

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Question about Anderson-Darling (adtest)
Not using adtest. Like the Ford Model T, which Henry Ford sold in any color as long as the color you wanted was black, adtest te...

13 days ago | 1

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Answered
Problem of ``sprandn'': the number of nonzero elements is inconsistent with density
Bruno has already explained why sprand/sprandn fail to produce the requested density of arrays. So this answer is here only to a...

13 days ago | 1

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How to place a number (1) in a random position in Line 1 in a matrix of zeros?
M = zeros(10,10); M(1,randi(10)) = 1; However, if you had no idea how to solve a basic problem of matrix indexing, you REALLY ...

13 days ago | 1

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find the std of each parameter after lsqlin
There are some issues that make this a little problematic. The main issue is if lsqlin finds itself butted up against a boundary...

13 days ago | 0

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Answered
How do I remove the z variable in the polynomial equation?
What you don't understand is that IF you did what you want, the polynomial will become diffcult to use and difficult to evaluate...

14 days ago | 1

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Can one run fminsearch on grids?
No. fminsearch presumes a continuously valued function, defined everywhere. You CANNOT use it to solve discrete problems. And ev...

14 days ago | 0

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Answered
Why is 4-by-2 matrix compatible with 4-by-1 vector?
You are using .* to do the multiplication. NOT * which is the linear algebra operator. MATLAB extends the vector implicitly int...

15 days ago | 0

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Fitting a Curve to an Uncurling Object
The curve fitting toolbox assumes the functions are SINGLE VALUED. There can only be ONE value of y for any x. If that is not tr...

15 days ago | 0

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How fast is fminsearch over brute force? or How fminsearch deal with a local/global min?
How fast is it? Since brute force is an extremely poor method to solve anything (unless your name happens to be the incredible H...

15 days ago | 0

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How to reduce dimension of griddedinterpolant?
whos Name Size Bytes Class Attributes eff_map 500x500 2000000 double ...

15 days ago | 0

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GA vs patternsearch for Integer problem with equality constraints
An exitflag of -2 means that GA never even found a feasible starting point for your problem. A larger population size lets it ra...

16 days ago | 1

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Can one run fminsearch for a function defined by cases?
Can you? Yes. Should you? This may sometimes be a poor idea, although it depends on the specific segment functions. Are the seg...

16 days ago | 1

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Generating parings of numbers and the pairs must not contain the same numbers
As Bruno has said, you are looking for pseudo-random derangements. So just to add some interesting information about derangement...

16 days ago | 0

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Int returns Int when decimals input
fw = ((k*l*vi)/c)*(((1+p*l)*vi)/c)^(k-1)*exp(-((1+p*l)*vi)/c)^k ; When k is some non-integer value, you are raising some non-tr...

16 days ago | 1

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How to solve linear programming problem?
Second answer, since the problem has now completely changed. Again, MATLAB is still totally unnecessary. Since you will probabl...

17 days ago | 0

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Why is it the answer from MATLAB is different from the other solving software? Where did I go wrong?
Usually when I see a confused question, where someone says "help, i got a strange answer", the reason is because they were not c...

17 days ago | 1

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Answered
Extraction of values from a cfit object
When you do not know how to pull some information from a class, the best thing is to try using methods to learn what you can do....

17 days ago | 0

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Nonlinear fit to 100 data sets with seven unknown
That you WANT the residual norm to be low is not really that relevant. Pick anything you may choose to want. For example, suppos...

17 days ago | 0

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How can I solve a system of many equations in 2 variables ?
I think you don't understand the concept of linear least squares, or linear regression. You have essentially a problem with 12 ...

18 days ago | 0

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Circshift function on very large array
Yes, but you need to understand that just because your mind can conceive of an idea, does not mean your computer can solve the t...

18 days ago | 2

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How do I use files from file exchange?
Download the .zip files. Decompress same. The result will be a directory. Add that directory to your search path. Pathtool is...

18 days ago | 2

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Answered
Ax-b, additional constraint
Why is it that you even think you have now 5 unknowns, not 10? Are you hoping that you can decde to fix 5 of those coefficients ...

19 days ago | 0

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Deleting an Element Modifies Other Elements
No. You are coming to a conclusion based on the wrong assumptions. It is NOT that deleting an element modifies other elements. ...

19 days ago | 2

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How can one do this calculation?
This is the perfect problem for the accumarray function. I'll add a few rows. A = [1 1 10 1 2 39 1 3 24 1 4 7 1 5 41 2 1 ...

19 days ago | 2

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Polynomial to Matrix form(canonical form)
I assume the question is to resolve a quadratic polynomial, perhaps: Q = x1^2 + 2*x1*x2 + x2^2 into a quadratic form. That...

20 days ago | 0

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find index of missing data point/ extrapolatation
Use the intersections code, written by Doug Schwarz, found for download from the file exchange. I90 = 0.9*max(I); [Tint,Iint...

20 days ago | 0

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