Answered

Is it possible to use runge-kutta 4th order method to solve a equation with three different variables? For instance I have a equation : dy/dt= (R-0.135y)/P

It looks like you do not have THREE different variables. You have P, which I presume is a constant? Do you know the value of P...

Is it possible to use runge-kutta 4th order method to solve a equation with three different variables? For instance I have a equation : dy/dt= (R-0.135y)/P

It looks like you do not have THREE different variables. You have P, which I presume is a constant? Do you know the value of P...

21 hours ago | 2

Answered

Using nested for loops to plot multiple approximations of Eulers method

Smile. Think about what you did. I think I know what you wanted to achieve, but look more carefully at what you have here. for...

Using nested for loops to plot multiple approximations of Eulers method

Smile. Think about what you did. I think I know what you wanted to achieve, but look more carefully at what you have here. for...

1 day ago | 0

Answered

Help Creating the following matrix

Very easy, really. A = zeros(3,4); A(1,1) = 3*eye; A(1,3) = 2*ones; A(1,4) = 2*ones; A(2,2) = 3*eye; A(2,3) = 2*ones; A(2...

Help Creating the following matrix

Very easy, really. A = zeros(3,4); A(1,1) = 3*eye; A(1,3) = 2*ones; A(1,4) = 2*ones; A(2,2) = 3*eye; A(2,3) = 2*ones; A(2...

2 days ago | 0

| accepted

Answered

Query about License number

Contact customer support. Answers is not that. So we cannot help you directly in any real way. https://www.mathworks.com/compan...

Query about License number

Contact customer support. Answers is not that. So we cannot help you directly in any real way. https://www.mathworks.com/compan...

2 days ago | 0

Answered

Fitting a sigmoid curve using curve fitting tool box

The problem is, there are many functional forms that people think of and call with the generic name "sigmoid". We can find a few...

Fitting a sigmoid curve using curve fitting tool box

The problem is, there are many functional forms that people think of and call with the generic name "sigmoid". We can find a few...

3 days ago | 0

Answered

Can anyone explain for loop ? And nested loops.

How can we do better than to suggest you read the help for for? It has examples in there. help for doc for A simple for loop:...

Can anyone explain for loop ? And nested loops.

How can we do better than to suggest you read the help for for? It has examples in there. help for doc for A simple for loop:...

3 days ago | 0

Answered

How to write while a set Q is not empty do the following in matlab?

What function tells you if a vector is empty? (Hint: isempty) What do you want? Not empty. So what is the logical negation oper...

How to write while a set Q is not empty do the following in matlab?

What function tells you if a vector is empty? (Hint: isempty) What do you want? Not empty. So what is the logical negation oper...

4 days ago | 0

| accepted

Answered

Solving of vectorial equations

You cannot do it, at least if these are completely general nonlinear equations, since there may be no unique solution for nonlin...

Solving of vectorial equations

You cannot do it, at least if these are completely general nonlinear equations, since there may be no unique solution for nonlin...

4 days ago | 1

Answered

Inverse of algebraic expression in Matlab

As is often the case, not all simple problems have an algebraic solution. In fact, as you have found, it is trivial to write one...

Inverse of algebraic expression in Matlab

As is often the case, not all simple problems have an algebraic solution. In fact, as you have found, it is trivial to write one...

5 days ago | 1

Answered

The quotient and remainder of a number divided by another (Euclidean Division)

What is the problem? :) You did it correctly. Well, except for the very last line. n = 19 d = 3 r = rem(n,d) q = (n-r)/d di...

The quotient and remainder of a number divided by another (Euclidean Division)

What is the problem? :) You did it correctly. Well, except for the very last line. n = 19 d = 3 r = rem(n,d) q = (n-r)/d di...

5 days ago | 0

Answered

need help on my matrix code

An if statement dose NOT work this way. You cannot use that single statement to act on each element of the array, independently....

need help on my matrix code

An if statement dose NOT work this way. You cannot use that single statement to act on each element of the array, independently....

6 days ago | 0

| accepted

Answered

so for when i try to mutiply the variable v my number is really big can someone explain why. The choose in is user input

I think it MAY be partly that you do not understand how to write numbers. Or, do you not understand how to write algebraic expre...

so for when i try to mutiply the variable v my number is really big can someone explain why. The choose in is user input

I think it MAY be partly that you do not understand how to write numbers. Or, do you not understand how to write algebraic expre...

7 days ago | 1

Answered

Cylinder fit to a point cloud data

You seem to be way overthinking this. xyz = REAL_data; xyz0 = mean(xyz) xyz0 = -0.024621 -18.89 0.75025 xyzh...

Cylinder fit to a point cloud data

You seem to be way overthinking this. xyz = REAL_data; xyz0 = mean(xyz) xyz0 = -0.024621 -18.89 0.75025 xyzh...

7 days ago | 0

| accepted

Answered

I cant solve linear programming

Who can solve it? Most likely, nobody. Your problem is unbounded. I can go through some mathematics to reduce it to show more cl...

I cant solve linear programming

Who can solve it? Most likely, nobody. Your problem is unbounded. I can go through some mathematics to reduce it to show more cl...

7 days ago | 1

Answered

Can anyone write a mathlab program for this question?

Can anyone write a mathlab program for this question? The answer is easy - Yes. I can. Do I win the prize? Oh. Wait. You asked...

Can anyone write a mathlab program for this question?

Can anyone write a mathlab program for this question? The answer is easy - Yes. I can. Do I win the prize? Oh. Wait. You asked...

8 days ago | 0

Answered

How can a matrix of randperm be generated with variable n*m?

SImpler than you think. M = 4; N = 3; [~,A] = sort(rand(M,N),1) A = 1 1 3 4 2 1 2 3 ...

How can a matrix of randperm be generated with variable n*m?

SImpler than you think. M = 4; N = 3; [~,A] = sort(rand(M,N),1) A = 1 1 3 4 2 1 2 3 ...

9 days ago | 1

| accepted

Answered

Unrecognized function or variable 'x'.

Where exactly did you define the value of x? I see this line: %x^2=5-y^2 But there is the minor flaw of a comment. Anyway, th...

Unrecognized function or variable 'x'.

Where exactly did you define the value of x? I see this line: %x^2=5-y^2 But there is the minor flaw of a comment. Anyway, th...

10 days ago | 0

Answered

Can someone help me solve this. I am trying to evaluate the integral.

You don't understand. Just because a sometimes useful mathematical way of writing the cube of a function like sin, is to write i...

Can someone help me solve this. I am trying to evaluate the integral.

You don't understand. Just because a sometimes useful mathematical way of writing the cube of a function like sin, is to write i...

10 days ago | 0

| accepted

Answered

negative x axis meaning

This is confusing as a question. You have a plot of some numbers. Some of them are negative. Of course MATLAB will extend the ax...

negative x axis meaning

This is confusing as a question. You have a plot of some numbers. Some of them are negative. Of course MATLAB will extend the ax...

10 days ago | 0

| accepted

Answered

precision of calculation with Matlab

This must of course fail as you are doing it, since out must generally exceed 2^53-1, the limits of flintmax for a double precis...

precision of calculation with Matlab

This must of course fail as you are doing it, since out must generally exceed 2^53-1, the limits of flintmax for a double precis...

10 days ago | 1

| accepted

Answered

Does someone has the Composite MicroMechanics COMM toolbox? Thanks!

Just contact the source. This link claims it to be freely available, by contacting the author. https://www.researchgate.net/pub...

Does someone has the Composite MicroMechanics COMM toolbox? Thanks!

Just contact the source. This link claims it to be freely available, by contacting the author. https://www.researchgate.net/pub...

11 days ago | 0

Answered

Question on pdepe solver

Why not just read the help? That is, first, I typed doc pdepe Quickly scan down through there, and I see that indeed, pdepe ...

Question on pdepe solver

Why not just read the help? That is, first, I typed doc pdepe Quickly scan down through there, and I see that indeed, pdepe ...

11 days ago | 0

| accepted

Answered

fminsearch and simulated annealing with penalties

You do not want to solve it using penalties. That tends to cause problems, making the solution more difficult. At best, the opti...

fminsearch and simulated annealing with penalties

You do not want to solve it using penalties. That tends to cause problems, making the solution more difficult. At best, the opti...

12 days ago | 0

Answered

How to create a smooth curve through data points?

We don't have your data, so I cannot give any examples. As well, I don't know your definition of a smooth curve. Do you want a...

How to create a smooth curve through data points?

We don't have your data, so I cannot give any examples. As well, I don't know your definition of a smooth curve. Do you want a...

12 days ago | 0

Answered

How can I plot a Sin or Cosine graph that looks this this?

Start with one of these: help fplot help ezplot But before that, start by reading the getting started tutorials.

How can I plot a Sin or Cosine graph that looks this this?

Start with one of these: help fplot help ezplot But before that, start by reading the getting started tutorials.

13 days ago | 0

Answered

Coding problem in pattern search optimization algorithm

Your objective function needs to return a SCALAR value for any set of inputs. That is, you cannot minimize two (or more) indepen...

Coding problem in pattern search optimization algorithm

Your objective function needs to return a SCALAR value for any set of inputs. That is, you cannot minimize two (or more) indepen...

14 days ago | 0

Answered

Can we use aliasing concept to achieve solution for following use case in MATLAB ?

I suppose you could do so, by writing a custom alias class to do it. It would seem a bit of a kludge though. But, no. MATLAB do...

Can we use aliasing concept to achieve solution for following use case in MATLAB ?

I suppose you could do so, by writing a custom alias class to do it. It would seem a bit of a kludge though. But, no. MATLAB do...

15 days ago | 0

Answered

Solving a over determined system in MATLAB

Is it the correct way? perhaps it might be, except that you have a typo in e3. Perhaps that is why you decided to try it with on...

Solving a over determined system in MATLAB

Is it the correct way? perhaps it might be, except that you have a typo in e3. Perhaps that is why you decided to try it with on...

15 days ago | 0

| accepted

Answered

How to fit a power law equation using three variables?

The answer is simple, sort of. But it very much depends on your data. For example, if Z varies by multiple orders of magitude ov...

How to fit a power law equation using three variables?

The answer is simple, sort of. But it very much depends on your data. For example, if Z varies by multiple orders of magitude ov...

15 days ago | 0

| accepted

Answered

How to evaluate a curve at infinite points inside it's upper and lower bounds.

If I plot your data, it it far too highly nonlinear to use any sort of a fit to the data directly. But plotted on log-log axes, ...

How to evaluate a curve at infinite points inside it's upper and lower bounds.

If I plot your data, it it far too highly nonlinear to use any sort of a fit to the data directly. But plotted on log-log axes, ...

17 days ago | 0