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hi, find the value of x theoretically?
Do you assume that every expression you can write down has an analytical, neatly written algebraic solution? Surely not. Start ...

2 years ago | 1

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Is a matrix with a condition number of 1e20 definitely more ill-conditioned than a matrix with a condition number of 1e19？
NO. There is effectively no significant difference between the two. At that point, you are into what are essentially random bit ...

2 years ago | 1

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How to generate vector with non-linear spacing?
It sounds like you want a deterministic, non-random set of points. You can use the inverse gaiussian CDF to do what you want. a...

2 years ago | 2

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Ordering multivariate polynomials by increasing higher order terms
The problem is, the symbolic toolbox does not use the term sequence you personally prefer. In fact, you can't control the sequen...

2 years ago | 0

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I'm doing an project in matlab software and my data set having more than 1 lakh images so can you prefer any best laptop for this processing in i7
I think you do not understand. Moving from an i5 to an i7 will improve things. Multiple cores, lots of memory will be nice, even...

2 years ago | 0

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Multivariate regression for constrained dependent variables
Sorry. You CANNOT insure that y1+y2 == 1, EXACTLY. At least not if there is any noise in your data. All you can do is to use it...

2 years ago | 0

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Using Matlab Runge Kutta Routine
"IT WON'T GO PAST THE FIRST INCREMENT". Lol. Exactly what do you think this does in the very beginning of the loop? for count ...

2 years ago | 0

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Unable to resolve the warning on ill conditioned Jacobian
A not uncommon misunderstanding about modeling. First, look carefully at your data. M = importdata('datai2j3.txt'); x = M(:,1...

2 years ago | 0

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volume of set of points in 3d space with gap
Is there any way you can make the convex hull adequately represent a region that is not in fact convex? Of course not! You have...

2 years ago | 0

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Problems by calculating zero points of a cubic function
Or, you can use analytical tools. syms x a f = -2*x^3 + x^2 + 0.5*x -8; % Remember to use * to multiply fa = f + a; Before y...

2 years ago | 0

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How to choose a single element randomly from a vector
I've upvoted the answer by @R. Please accept it. My answer here is only to express some ideas that are really best put in a comm...

2 years ago | 0

Discussion

Using MATLAB to find a generative equation for a sequence
This stems purely from some play on my part. Suppose I asked you to work with the sequence formed as 2*n*F_n + 1, where F_n is t...

2 years ago | 8

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Setting unknown constants in equation for known data
This is the classic regression problem, either linear or nonlinear, and that depends on how the parameters enter into the "model...

2 years ago | 1

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Efficient management of interacting atoms based on their mutual distance
No. It is NOT true that in a set, if atom x is one of the k closest atoms to atom y, that the converse is also true, i.e., that ...

2 years ago | 0

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Numerical integration of area
The region in color? The integral will be negative, or course, since depth is entirely negative. But you perform such an integr...

2 years ago | 1

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Particle Swarm Optimization - What method is used to find local minimum?
Particle swarm optimization, https://en.wikipedia.org/wiki/Particle_swarm_optimization is one of many meta-heuristics used to ...

2 years ago | 0

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Any ideas for making this exponential decay function match the actual data better?
(I spent so much time writing this as a comment, I might as well make it an answer.) @Image Analyst asks a valid question. I ha...

2 years ago | 1

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Remove exponentials with positive argument in symbolic MATLAB
Very often symbolic computations are less easy than you want them to be, because the computer does not see one thing as simple v...

2 years ago | 0

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I need to create a polygon or buffer along an irregular shaped coastline in a 2D array of gridded sea temperature data.
Easy enough. Almost trivial, in fact. Of course, making a buffer zone of width exactly one pixel is alays going to be slightly p...

2 years ago | 0

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Derive full formula from fitlm(X,y,"quadratic")
X = rand(258,6); y = rand(258,1); mdl = fitlm(X, y, "quadratic") There are 6 variables, here called x1...x6, corresponding ...

2 years ago | 1

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Running a large array
Memory is cheap. Get more memory. I'm sorry, but if you want to work with big data, you will often need sufficient capabilities...

2 years ago | 0

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Why did I get two different results in nonlinear programing problems
You have a nonlinear problem. You need to understand that given any set of starting values, an optimizer will sometimes find a s...

2 years ago | 0

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The equation of the curve at the intersection of the two 3D surface, One is a cylinder.
It is not always trivial to find that curve as some explicit function. Here, yes, you can do so easily enough. syms x y z r = ...

2 years ago | 2

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creating loop that stops at correct formula for the given input.
You have a fundamental problem here, that you fail to understand. You CANNOT solve for more than 6 parameters, given only 6 data...

2 years ago | 0

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Help solving linear ordinary differential equation that involves matrix
I would postulate that in fact, it DOES give the correct solution, at least to the problem you posed, but that it is not in the ...

2 years ago | 0

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How to solve this problem combining sequences and reasoning using code?
I would probably think first, and only then write code. I gather the global sequence will always be 1:(4*m+2), so the first 4*m+...

2 years ago | 0

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Find closest value in array
To be honest, the easiest way is to use knnsearch. It works well in one dimension, as you have here, and it should be quite effi...

2 years ago | 2

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Calculations with distributions of variables only
Um, yes. And, no. Firstly, very likely there will be no "named" distribution for even such a simple expression. And depending ...

2 years ago | 0

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How to fastly calculate this matrix operation
First, use better variables. I is a terrible name to use , especially capital I, since it is so easily confused with the number ...

2 years ago | 0

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Find the turing pattern for following equation
I won't do your homework, since this is highly likely to be homework with no effort made on your part, just from the way you ask...

2 years ago | 0

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