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can any one help me to find simple empirical model (equation) with a little parameters for this data
Why not try it? This seems adequate: x=[31.96 30.25 28.27 26.84 25.4 24 23.27 21.89 20.85 18.6 17.02 16 15.81 13.6 12 11.19 9....

18 días hace | 0

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How to determine sets with only unique values across the columns of a large logical array?
Are you asking for ALL pairs that share no common elements? That will probably require loops. But I would not use a double loop....

19 días hace | 0

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interp1 fails to interpolate on a non-one-to-one function (curve)
interp1 does not fail here. It merely fails to do what it was not programmed to do! Interp1 does as designed. That you try to us...

19 días hace | 2

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Given a contour plot is there a function which returns a matrix corresponding to the density of lines at a given (x,y) coordinate?
Is there some specific function? No. But what does a high density of contour lines mean? It says the gradient is large in that v...

21 días hace | 3

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The sufficient and necessary conditon of fmincon funciton can find out the global optimal solution but not some other local optimal solutions
I'm sorry, but no. Fmincon CANNOT be assured of always finding a global solution. In fact, I can think of many ways it will fail...

22 días hace | 1

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Now working. Many thanks for fixing it. As a test to verify that claim, I leave you with this complex mathematical computation. ...

22 días hace | 0

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find the way to transfer 2D projection back to 3D
The projection you used into the nullspace was correct, AND robust. However the inverse operation is less easy to perform. You n...

23 días hace | 0

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How to solve multiple equation with several conditions in it?
Is chi known? If not, then chi is one of your unknowns, and it must be solved for. Regardless, there will be infinitely many sol...

24 días hace | 0

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case sensitivity issue of "load" function
You cannot change the behavior of existing supplied code. If it works that way, then it does, and there is no way to tell load t...

25 días hace | 0

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I need to input a matrix of size 2x2 which is something like this A= [ 1 - 1.8629z-1 + 0.8669z-2 , 0 ; 0 , 1 -1.8695z-1 + 0.8737z- 2 ] which is a 2x2 Matrix
So do it. What is the problem? If z is known, then just type it in, pretty much as written. Do you know how to raise a number ...

26 días hace | 0

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MATLAB code of intersection
I answered exactly this question only recently. So your class must be all getting this homework assignment. https://www.mathwor...

26 días hace | 0

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Is MATLAB 100% reliable? Do the users need to modify it according to their usage? I need this for my presentation in class. Thank you!
I'm sorry, but this question makes no sense at all. Define what you mean by "reliable" in this context. Are you asking if it wil...

26 días hace | 0

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Precision Difference Between MATLAB and Simulink MATLAB Function
No. This is not a difference in the precision used. Both tools will use double preicsion arithmetic to store all numbers. Inste...

27 días hace | 0

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gamma function with two parameters
There is no common definition of a two parameter gamma "function" in mathematics. So whatever you are asking, you need to be mor...

27 días hace | 0

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How to get x value for a given y value in a interp1 figure?
You need to understand there is no unique solution. So asking for THE value of x has no answer, since there are two possible sol...

27 días hace | 0

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3D plot with the Earth in the center
With the mapping toolbox, easy. Without the mapping toolbox, more difficult. Nothing is impossible, of course. But lacking the ...

28 días hace | 0

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How to draw a map of a country and mark the location of an object on it?
Do you have the mapping toolbox? https://www.mathworks.com/products/mapping.html Your question is easy to answer with that too...

28 días hace | 0

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I want to download Matlab 2019or 2021 or 2020 for my macOs monterey 12.6
There is a button that allows you to download previous releases. On the upper right of the page as I recall. HOWEVER, it also l...

28 días hace | 0

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How can I subtract elements in an array from the element before it.
help diff

28 días hace | 1

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How to write in Matlab a matrix whose coefficients depend on a real alpha parameter
Many ways. It seems unclear exactly what is your goal. And what are x and y? Are they just a list of numbers? Or a sequence as l...

29 días hace | 0

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how to build a magic matrix manually of even n*n matrix?
@the cyclist is correct, that this is purely an algorithm question. But you did write code. Anyway, I'd start here, if I were y...

29 días hace | 0

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How do I plot the cross sectional area and centroid of an I-Beam using pgon ?
The funny thing is, your code was indeed essentially correct. You just started out wrongly. x = [ 0 0 1 1 2 2 3 3 4 4...

30 días hace | 0

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I got Inf when calculating 13959^475, how can I solve this problem?
Yes, you can use syms. However, you do NOT want to compute a huge power using syms directly, and THEN compute a modulus. Just co...

alrededor de 1 mes hace | 0

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Error With Least Squares Approximation
There are two serious issues in what you are doing, making this apprach, sadly, truly numerical nonsense. You think you did some...

alrededor de 1 mes hace | 0

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I unable to get trial version. Can you help?
No. We cannot help you. We are not your local customer support representatives! Answers is just a volunteer forum. We have no ...

alrededor de 1 mes hace | 0

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Initial Conditions for Newton Raphson Method for 9 equations 9 unknowns problem set
Not every system of equations you will write down has a solution. Starting from a random position does not insure you will find...

alrededor de 1 mes hace | 0

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Average Optimization using GA or intlinprog algorithms
This is not an optimization problem. You only look at it in that way. It is purely a problem of a Monte Carlo simulation, to com...

alrededor de 1 mes hace | 0

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MacOS(14.0) and Matlab 2014a format problem
R2014a does not run on that recent of the Mac OS. It is not supported there, and in fact, I am surprised it even comes that clos...

alrededor de 1 mes hace | 0

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Can multiple versions of MATLAB be installed on the same Windows PC using the same license number for code compatibility?"
Yes. I frequently have multiple releases on my machine. It is occasionally useful, but the older releases are usually there in m...

alrededor de 1 mes hace | 0

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how to use lsqcurvefit on a function that contain a series
You only have ONE data point. xdata=420; ydata=0.1; So only ONE piece of information! How do you intend to estimate TWO param...

alrededor de 1 mes hace | 0