Answered
Matlab sparse matrix does not come out as I would expect
S=sparse([1 3 2 1 4],[3 1 4 1 4],[1 2 3 4 5],4,4) full(S) It works just fine. What did you do wrong? LOOK CAREFULLY AT WHAT Y...

ongeveer 2 maanden ago | 1

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Answered
defining upper and lower limits of a matrix
Is there any way to set the min and/or maximum values of the elements in a matrix, and do so automatically? NO. Well, not withou...

ongeveer 2 maanden ago | 1

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how to optimize block toeplitz matrix ?
The one thing you NEVER, EVER, EVER want to do is stuff the elements into a sparse array iteratively. NEVER DO THAT!!!!!!!!!!!!!...

ongeveer 2 maanden ago | 0

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Answered
PC specs for heavy & complex simulations
No computer will ever be as fast as you want it to be. Even if you do get the fastest, most powerful computer you can possibly ...

2 maanden ago | 0

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Which statistic is minimized in curve fitting app
The sum of squares of the residuals is mimimized. SSE effectively stands for Sum of Squares of Errors. What is the 2-norm? Just...

2 maanden ago | 1

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I need to draw a shape in matlab help me
This is not a difficult problem. Not at all. But it is impossible for us to do it, based on having been given no information exc...

2 maanden ago | 0

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Simmetrical Constraints in Multivariate Regression
Now please stop asking this question. I already suggested 3 ways you MIGHT solve it, the first time you asked. You could have ad...

2 maanden ago | 0

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Find limits satisfying a condition on an integral
You have posed a interesting problem, with a subtle flaw that possibly you don't understand. You asked to find an integral limi...

2 maanden ago | 0

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Simmetry constraints in multivariate regression.
Sure. In fact, I can think of at least 3 ways to do so, almost trivially. Just estimate the upper (or lower half) of the matrix...

2 maanden ago | 1

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how to find curve fiitng equation through custom equation
You can't. Yes, I want world peace. But do you think that just wanting it is sufficient? Nothing I do will change it either. The...

2 maanden ago | 0

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Accidental deletion of project, how to contact file exchange admin
Why did you do that? Silly question, I know. ;-) Yes, it should be undoable. I'll contact the FEX admin and ask them to resolve...

2 maanden ago | 0

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Answered
Complex multiplication giving incorrect result
Yet another person who does not understand the realities of double precision arithmetic. Note that the imaginary part is roughl...

2 maanden ago | 2

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What is the best kind of MATLAB function to teach beginners?
I think I agree with @Stephen23, in that teaching symbolics first can cause issues. We see many new users who think everything s...

2 maanden ago | 1

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Different results of the same caculation by loop code and by array code
As is almost always the case, when we see this complaint, it is because you do not understand how arithmetic works in terms of d...

2 maanden ago | 0

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我买了学生版
Are you sure you have the student edition, and not the 30-day free trial? It would appear you have gotten the trial version, by ...

3 maanden ago | 0

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MINLP problem in MATLAB with both integer constraints and nonlinear equality constraints
NOPE. Were I writing that code, hoping to solve a problem with integer variables, and general nonlinear equality constraints, et...

3 maanden ago | 1

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How to stabilize the edge effects in a cubic B-spline?
You don't show any data, so there is little we can actually do in a constructive way. But you don't have a great deal of control...

3 maanden ago | 0

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Answered
What is the origin of "Weissinger Implicit ODE"
I usually laugh at the results of the AI tools available. Half the time they are blowing smoke, since they don't really understa...

3 maanden ago | 0

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my code does not have an answer
The failure of both vpasolve and fsolve suggests it is lkely no solutions exist at all for your problem. But merely the failure ...

3 maanden ago | 0

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Improved Euler's method compared to 4th order Runge - Kutta's method
Is it as good? COMPARE IT TO THE ANALYTICAL SOLUTION! We have gone through exactly this before. A big problem however, is you a...

3 maanden ago | 0

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Answered
Clarification on Calculations for $v_{1,z} $ in "A Method for Verifying the Generalized Riemann Hypothesis"
I think, from almost line 1 of what you did, you don't understand double precision arithmetic, and that will cause everything yo...

3 maanden ago | 0

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Is the methodology used in "sdRemoveImpossibles" a heuristic or is it derived from an academic publication?
Note that just because something is found in a paper, does not make it even necessarily good mathematics. The lack of any requir...

3 maanden ago | 0

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Infinite while loop for Euler's method in order to solve ode
I think you misunderstand what is happening. Your ODE is y' = y - y^2/2 ymax is found when y' = 0, and so you find that y...

3 maanden ago | 0

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Answered
generate random numbers among each non zero column elements
This is a 7 year old question, so there is probably no real utility in my posting an answer. But it is an interesting question t...

3 maanden ago | 0

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Surface triangulation of 3D points cloud
A common solution is to use a CRUST code. In fact, there is a version of CRUST to be found on the File Exchange, here: https://...

3 maanden ago | 0

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Identify two linear trends from the data
The amount of noise in your data makes it almost impossible to estimate the two trends in any intelligent way, even assuming the...

3 maanden ago | 0

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How can I make the following heatmap smoother while preserving the contours outlined by the green line?
I don't think interpolating your data will fix the problem, as your data is seriously bumpy. load DataMe.mat surf(TPP) view(...

3 maanden ago | 0

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Cannot Understand a Command
I would guess what they did was to ask you to write a matrix by something like the following description: M(a,b) = a + b w...

3 maanden ago | 0

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Solving non linear system with fsolve
Whenever you have a problem with hugely varying constants in it like this, it makes sense to consider if you should transform th...

3 maanden ago | 0

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How do I find the equation of points on a spline curve?
This is a question that gets aslked many many times about splines. And, well, you can't easily get a simple equation, as there i...

3 maanden ago | 0