Answered

fsolve sensitive to guess values and error messages

This same question gets asked on literally a daily basis. The problem is not fsolve. It lies in understanding nonlinear equation...

fsolve sensitive to guess values and error messages

This same question gets asked on literally a daily basis. The problem is not fsolve. It lies in understanding nonlinear equation...

10 hours ago | 0

Answered

I have a problem. It can not run. Help me please.

When you say only that something does not run, then tell people what was the error message. Show the COMPLETE error message. Thu...

I have a problem. It can not run. Help me please.

When you say only that something does not run, then tell people what was the error message. Show the COMPLETE error message. Thu...

13 hours ago | 1

Answered

How to divide a distance into some equal parts?

You have two points. Call they xy1 and xy2, where the xy are row vectors of length 2. For example... xy1 = [-1,3]; xy2 = [2,5]...

How to divide a distance into some equal parts?

You have two points. Call they xy1 and xy2, where the xy are row vectors of length 2. For example... xy1 = [-1,3]; xy2 = [2,5]...

13 hours ago | 0

Answered

Replace the empty output of find() by the closest element

You are trying to use the wrong tool (i.e., find) to solve this. Well, you could use find, I suppose, with some significant effo...

Replace the empty output of find() by the closest element

You are trying to use the wrong tool (i.e., find) to solve this. Well, you could use find, I suppose, with some significant effo...

1 day ago | 3

| accepted

Answered

Calc of mean and standard deviation

It should look like what photo? The mind reading toolbox has never gotten past beta testing state, and the copy I have is full o...

Calc of mean and standard deviation

It should look like what photo? The mind reading toolbox has never gotten past beta testing state, and the copy I have is full o...

2 days ago | 0

Answered

How do I obtain the derivatives after interp2 with the 'spline' option?

interp2 does not return derivative information at the interpolation points. If you want to generate that at some general interp...

How do I obtain the derivatives after interp2 with the 'spline' option?

interp2 does not return derivative information at the interpolation points. If you want to generate that at some general interp...

3 days ago | 0

Answered

fminsearch for fitting a function to experimental data

Even after you fix the problems in multiplication, let me look at your model and your data. syms c2 k12 k2e t fun = 120*c2*k12...

fminsearch for fitting a function to experimental data

Even after you fix the problems in multiplication, let me look at your model and your data. syms c2 k12 k2e t fun = 120*c2*k12...

3 days ago | 0

Answered

Symbolic solution trigonometric equation

Why not try it? syms a b c x >> xsol = solve(a*sin(b*x) + sin(c*x) == 0,x) Warning: Unable to find explicit solution. For opt...

Symbolic solution trigonometric equation

Why not try it? syms a b c x >> xsol = solve(a*sin(b*x) + sin(c*x) == 0,x) Warning: Unable to find explicit solution. For opt...

4 days ago | 0

Answered

How do i calculate these 3 unknows in these Equations

Easy enough. syms a b c x y z EQ(1) = a^2 + b^2 + a*b == x^2; EQ(2) = b^2 + c^2 + b*c == y^2; EQ(3) = a^2 + c^2 + a*c == z^2...

How do i calculate these 3 unknows in these Equations

Easy enough. syms a b c x y z EQ(1) = a^2 + b^2 + a*b == x^2; EQ(2) = b^2 + c^2 + b*c == y^2; EQ(3) = a^2 + c^2 + a*c == z^2...

4 days ago | 1

| accepted

Answered

How to create a best fit line for data with an aymptote?

It partly depends on your goal. Do you just want to best estimate the constant asymptote? Or, are you looking for some function ...

How to create a best fit line for data with an aymptote?

It partly depends on your goal. Do you just want to best estimate the constant asymptote? Or, are you looking for some function ...

6 days ago | 0

Answered

selection of n disticnt vector

Easy enough. A = 1:10; index = randperm(10,6); a = A(index(1:3)); b = A(index(4:6)); Since randperm generates samples witho...

selection of n disticnt vector

Easy enough. A = 1:10; index = randperm(10,6); a = A(index(1:3)); b = A(index(4:6)); Since randperm generates samples witho...

6 days ago | 0

Answered

how do I write variance in percentage?

A percentage of what? Percentage always implies you are comparing one number to another. That is, suppose you have some variable...

how do I write variance in percentage?

A percentage of what? Percentage always implies you are comparing one number to another. That is, suppose you have some variable...

6 days ago | 0

Answered

Can I update a toolbox without updating Matlab?

Short answer: No. Long answer: Nnnnnooooooooo. Why not? You can't do it, because then the versions would not be consistent. Ju...

Can I update a toolbox without updating Matlab?

Short answer: No. Long answer: Nnnnnooooooooo. Why not? You can't do it, because then the versions would not be consistent. Ju...

7 days ago | 0

| accepted

Answered

Matlab implementation of AlphaZero

Now that I have some free time... I'm pretty sure the answer is no. Alphazero is a tool that was developed that could learn g...

Matlab implementation of AlphaZero

Now that I have some free time... I'm pretty sure the answer is no. Alphazero is a tool that was developed that could learn g...

7 days ago | 0

Answered

scatter3 error i not understand

Hmm. It took me a minute to see what the answer was from the error that was generated. scatter3(X,Y,Z,P) Error using scatter3 ...

scatter3 error i not understand

Hmm. It took me a minute to see what the answer was from the error that was generated. scatter3(X,Y,Z,P) Error using scatter3 ...

7 days ago | 1

Answered

How can I write a function for this

Use plotregion, found on the file echange. https://www.mathworks.com/matlabcentral/fileexchange/9261-plot-2d-3d-region Note th...

How can I write a function for this

Use plotregion, found on the file echange. https://www.mathworks.com/matlabcentral/fileexchange/9261-plot-2d-3d-region Note th...

7 days ago | 0

Answered

Getting the linear portion of a non-linear curve

As is often the case on a question like this, you have been too vague for us to comprehensively understand what you do "have". (...

Getting the linear portion of a non-linear curve

As is often the case on a question like this, you have been too vague for us to comprehensively understand what you do "have". (...

7 days ago | 2

Answered

rotating this curve 20degrees

I would normally ask why not try it yourself, but I realize there are some issues that can easily catch you here. H = plot(t,sd...

rotating this curve 20degrees

I would normally ask why not try it yourself, but I realize there are some issues that can easily catch you here. H = plot(t,sd...

9 days ago | 2

Answered

Why 4.8/1.6 is not equal to 3?

While there has been a lot of good discussion in the other answer, let me add a few points. When you type 4.8 in MATLAB, does ...

Why 4.8/1.6 is not equal to 3?

While there has been a lot of good discussion in the other answer, let me add a few points. When you type 4.8 in MATLAB, does ...

11 days ago | 1

Answered

How can I solve linear equation system in parallel?

You already are doing that! That is, decomposition uses all of the cores you have available for large problems. Watching my ac...

How can I solve linear equation system in parallel?

You already are doing that! That is, decomposition uses all of the cores you have available for large problems. Watching my ac...

11 days ago | 1

| accepted

Answered

How can I get confidence intervals when the Jacobian matrix has an almost zero vector?

This is probably not a failure of the assumption of Gaussian arrors, though that may indeed be the case too. I cannot know. Wha...

How can I get confidence intervals when the Jacobian matrix has an almost zero vector?

This is probably not a failure of the assumption of Gaussian arrors, though that may indeed be the case too. I cannot know. Wha...

11 days ago | 0

Answered

Can I run MAtLab on mac

Yes. Apparently so. https://www.mathworks.com/support/requirements/matlab-system-requirements.html

Can I run MAtLab on mac

Yes. Apparently so. https://www.mathworks.com/support/requirements/matlab-system-requirements.html

12 days ago | 0

Answered

Fit a conic section without mirror image hyperbola

This goes back to basic algebra. When does a conic section describe an ellipse versus a hyperbola? https://en.wikipedia.org/wik...

Fit a conic section without mirror image hyperbola

This goes back to basic algebra. When does a conic section describe an ellipse versus a hyperbola? https://en.wikipedia.org/wik...

12 days ago | 0

Answered

Distance between points of a 3D centreline

Why not try diff? For example, what does diff(CL,[],1) do? TRY IT! What is distance? Does that give you something you might b...

Distance between points of a 3D centreline

Why not try diff? For example, what does diff(CL,[],1) do? TRY IT! What is distance? Does that give you something you might b...

13 days ago | 0

Answered

Signal into tolerance range - Comparison algorithm

It is often the case when my answer wants to be both no and yes. That is, no, there is no direct tool that does what you seem to...

Signal into tolerance range - Comparison algorithm

It is often the case when my answer wants to be both no and yes. That is, no, there is no direct tool that does what you seem to...

14 days ago | 0

Answered

How to graphically represent the global minimum of an optimization problem with more than two variables?

Do you have a multi-dimensional holographic monitor? Yes, I know, this will not be invented for many years if ever, but that is ...

How to graphically represent the global minimum of an optimization problem with more than two variables?

Do you have a multi-dimensional holographic monitor? Yes, I know, this will not be invented for many years if ever, but that is ...

15 days ago | 0

Answered

Fast method to find average pairwise distance of a very large matrix?

You cannot compute the 100 billion pairwise distances, because the matrix won't fit in memeory. (Ok, symmetry reduces it to be o...

Fast method to find average pairwise distance of a very large matrix?

You cannot compute the 100 billion pairwise distances, because the matrix won't fit in memeory. (Ok, symmetry reduces it to be o...

15 days ago | 0

| accepted

Answered

How to get multiple outputs from a function?

[x,y] = subfuntest(a,b); When you call it with no arguments, it returns only the first, putting it in the default variable name...

How to get multiple outputs from a function?

[x,y] = subfuntest(a,b); When you call it with no arguments, it returns only the first, putting it in the default variable name...

16 days ago | 1

| accepted

Answered

how to find the sum of rows in an array, that fit a condition?

When a problem is too complex to solve, then break it down into SMALLER parts, that you can handle. You want to know how many r...

how to find the sum of rows in an array, that fit a condition?

When a problem is too complex to solve, then break it down into SMALLER parts, that you can handle. You want to know how many r...

16 days ago | 1

| accepted

Answered

Normal Distribution Specifying parameters

Hint: What does normcdf tell you? (In fact, I think this totally gives the answer away, IF you understand what the CDF means.) ...

Normal Distribution Specifying parameters

Hint: What does normcdf tell you? (In fact, I think this totally gives the answer away, IF you understand what the CDF means.) ...

17 days ago | 0