Answered

Problem with my non linear pendulum code

Why do you think there is a problem? The code runs fine. Are you worried that the editor tells you that essentially, t is not u...

Problem with my non linear pendulum code

Why do you think there is a problem? The code runs fine. Are you worried that the editor tells you that essentially, t is not u...

10 dagar ago | 1

Answered

How is the polyarea function input order to receive correct results?

Yes. You do need to think about what you are doing. I'll create a quasi-triangular region as an example. px = [0, 1, .5, .49];...

How is the polyarea function input order to receive correct results?

Yes. You do need to think about what you are doing. I'll create a quasi-triangular region as an example. px = [0, 1, .5, .49];...

11 dagar ago | 0

| accepted

Answered

How to change a column vector into a square a matrix?

This is something that I've sometimes been surprised that is not already a function in MATLAB, thus, to create a symmetric matri...

How to change a column vector into a square a matrix?

This is something that I've sometimes been surprised that is not already a function in MATLAB, thus, to create a symmetric matri...

11 dagar ago | 3

| accepted

Answered

Matlab determinant equation solver

Just for kicks, I assume that you really have 792 such 3x3 problems. JUST USE A LOOP. Could you convert this into a cell array o...

Matlab determinant equation solver

Just for kicks, I assume that you really have 792 such 3x3 problems. JUST USE A LOOP. Could you convert this into a cell array o...

11 dagar ago | 0

| accepted

Answered

For loop giving me wrong values

I tried to look through the code for a few minutes now, looking for something obvious. So then I downloaded your data, put your ...

For loop giving me wrong values

I tried to look through the code for a few minutes now, looking for something obvious. So then I downloaded your data, put your ...

12 dagar ago | 1

Answered

Assign values to intervals of matrix

Use MATLAB as it is designed to be used - as a language that works with vectors and matrices. A(:,3) = repelem(t1,580);

Assign values to intervals of matrix

Use MATLAB as it is designed to be used - as a language that works with vectors and matrices. A(:,3) = repelem(t1,580);

12 dagar ago | 1

| accepted

Answered

Dependent swarm size PSO

You could write your own PSO tool. But that would be your choice. And there is no assurance this will work better. And structuri...

Dependent swarm size PSO

You could write your own PSO tool. But that would be your choice. And there is no assurance this will work better. And structuri...

13 dagar ago | 0

| accepted

Answered

Why doesn't Multistart converge to the optimal solution?

Sadly, there is NO method that can absolutely, positively insure the optimal solution is found. No matter how hard you try, I ca...

Why doesn't Multistart converge to the optimal solution?

Sadly, there is NO method that can absolutely, positively insure the optimal solution is found. No matter how hard you try, I ca...

13 dagar ago | 1

Answered

Why doesn't matlab recognize my variables?

What is sketchy is the invalid MATLAB syntax you have created in multiple lines. When you write things like this: Q = 5 e (-...

Why doesn't matlab recognize my variables?

What is sketchy is the invalid MATLAB syntax you have created in multiple lines. When you write things like this: Q = 5 e (-...

13 dagar ago | 1

Answered

Integration of a derivative(arc length formula)

I have absolutely no idea what it is you are trying to do, because your code makes no sense. So instead, I'll just show you ho...

Integration of a derivative(arc length formula)

I have absolutely no idea what it is you are trying to do, because your code makes no sense. So instead, I'll just show you ho...

14 dagar ago | 2

| accepted

Answered

How do I set an integer condition for fmincon?

You cannot do this using fmincon. Period. fmincon is not designed to allow this class of condition. Use a different optimizer th...

How do I set an integer condition for fmincon?

You cannot do this using fmincon. Period. fmincon is not designed to allow this class of condition. Use a different optimizer th...

15 dagar ago | 0

Answered

Genetic Algorithm Convergence problem: big range of best fit square errors

Is there any optimal set? No. If there was some optimal set of algorithmic parameters, do you think there is any reason they wou...

Genetic Algorithm Convergence problem: big range of best fit square errors

Is there any optimal set? No. If there was some optimal set of algorithmic parameters, do you think there is any reason they wou...

15 dagar ago | 0

Answered

ODE45 not working

One must wonder if the reason a parameter NEVER changes, is if the derivative is always identically zero. Then I look at the e...

ODE45 not working

One must wonder if the reason a parameter NEVER changes, is if the derivative is always identically zero. Then I look at the e...

16 dagar ago | 0

Answered

Out of memory Problem [Problem 2 , Project Euler (Sum of even Fibonacci numbers)]

Note that IF you are really trying to solve PE #2 (it has been a moderately long time since I was actively solving PE problems o...

Out of memory Problem [Problem 2 , Project Euler (Sum of even Fibonacci numbers)]

Note that IF you are really trying to solve PE #2 (it has been a moderately long time since I was actively solving PE problems o...

16 dagar ago | 0

| accepted

Answered

Why I can't plot an implicit form of function including abs()?

First, you are tryign to do the wrong thing here: fimplicit(abs(y-x)*(1+y/x)^2==0); That creates a LOGICAL result. Then you as...

Why I can't plot an implicit form of function including abs()?

First, you are tryign to do the wrong thing here: fimplicit(abs(y-x)*(1+y/x)^2==0); That creates a LOGICAL result. Then you as...

16 dagar ago | 0

| accepted

Answered

curve fitting and optimisation code problems for f(x)= a.*exp(-b./(x.^p)) to dataset

A serious problem with this is what I would suggest looks like almost two functions merged into one. Worse, the two "curves" at ...

curve fitting and optimisation code problems for f(x)= a.*exp(-b./(x.^p)) to dataset

A serious problem with this is what I would suggest looks like almost two functions merged into one. Worse, the two "curves" at ...

17 dagar ago | 2

| accepted

Answered

Multi-precision linear programming

None in MATLAB. However, I there is some question as to you really need super high multiple precision support. Do you have data ...

Multi-precision linear programming

None in MATLAB. However, I there is some question as to you really need super high multiple precision support. Do you have data ...

17 dagar ago | 0

Answered

Random Numbers Generation - For Loop VS 3D Matrix

It really is impossible to know something like this, unless you have the code sitting there in front of you. And that is somethi...

Random Numbers Generation - For Loop VS 3D Matrix

It really is impossible to know something like this, unless you have the code sitting there in front of you. And that is somethi...

18 dagar ago | 2

| accepted

Answered

solving PDE problem : Linear Advection diffusion equation problem

First, it looks as if you are using ode15s for no good reason. Typically, unless you have some initial expectation your IVP is a...

solving PDE problem : Linear Advection diffusion equation problem

First, it looks as if you are using ode15s for no good reason. Typically, unless you have some initial expectation your IVP is a...

19 dagar ago | 0

| accepted

Answered

write this following matrix

Try this: n = 100; D = (diag(ones(n-1,1),1) - diag(ones(n-1,1),-1))/(2*h); You can also use spdiags. or sparse, or many other...

write this following matrix

Try this: n = 100; D = (diag(ones(n-1,1),1) - diag(ones(n-1,1),-1))/(2*h); You can also use spdiags. or sparse, or many other...

19 dagar ago | 0

| accepted

Answered

Finding all unique permutations of a set

First, lets see if your task is even possible to do. You would be surprised. Far too often people seem to think they have immens...

Finding all unique permutations of a set

First, lets see if your task is even possible to do. You would be surprised. Far too often people seem to think they have immens...

19 dagar ago | 0

Answered

How to get set of outermost points out of given data set

Has nobody answered you? Oh well. here goes. Part of the problem is you only showed a picture of your data. A picture may be wor...

How to get set of outermost points out of given data set

Has nobody answered you? Oh well. here goes. Part of the problem is you only showed a picture of your data. A picture may be wor...

20 dagar ago | 0

Answered

How can I define split-complex number?

You would need to create a custom class for the object, where you will then define how arithmetic is to be performed. That is, y...

How can I define split-complex number?

You would need to create a custom class for the object, where you will then define how arithmetic is to be performed. That is, y...

21 dagar ago | 0

| accepted

Answered

Implementation of array of queues

Standard arrays must be rectangular. However cell arrays are the perfect solution. C = {1:3, 1:5,1:8} C = 1×3 cell array ...

Implementation of array of queues

Standard arrays must be rectangular. However cell arrays are the perfect solution. C = {1:3, 1:5,1:8} C = 1×3 cell array ...

21 dagar ago | 0

| accepted

Answered

How to find the nearest positive definite matix

You can always just download my nearestSPD function from the file exchange. (Note that it does come with a reference to how it w...

How to find the nearest positive definite matix

You can always just download my nearestSPD function from the file exchange. (Note that it does come with a reference to how it w...

21 dagar ago | 0

Answered

How can i plot surfaces for a recursive function?

Being recursive is not relevant to anything material. As long as you can evaluate it, do so. For example, you might create an ar...

How can i plot surfaces for a recursive function?

Being recursive is not relevant to anything material. As long as you can evaluate it, do so. For example, you might create an ar...

21 dagar ago | 1

Answered

vpa doesnt transform the roots of a polynomial equation to numerical results

You want numerical roots, for completely general k? Brute force is a problem, since those roots would still be a function of k. ...

vpa doesnt transform the roots of a polynomial equation to numerical results

You want numerical roots, for completely general k? Brute force is a problem, since those roots would still be a function of k. ...

21 dagar ago | 2

Answered

double summation of a matrix

Of course it does work to use loops. Therefore, your loops were not written correctly. :-) However, it is far easier to write th...

double summation of a matrix

Of course it does work to use loops. Therefore, your loops were not written correctly. :-) However, it is far easier to write th...

22 dagar ago | 0

| accepted

Answered

Convolution and tolerances: how do I calculate the probability density function of the difference between two dimensions? (mechanical engieering)

Jeff has already answered this to my satisfaction, so I have upvoted his answer. But just to expand on things, to add some thoug...

Convolution and tolerances: how do I calculate the probability density function of the difference between two dimensions? (mechanical engieering)

Jeff has already answered this to my satisfaction, so I have upvoted his answer. But just to expand on things, to add some thoug...

23 dagar ago | 0