Answered

Why do colors "gray out" when I save figure as .eps

Ah, from the way your figure looks, it seems the "error-shade" function you use uses alpha-blending - that is colour-patches tha...

Why do colors "gray out" when I save figure as .eps

Ah, from the way your figure looks, it seems the "error-shade" function you use uses alpha-blending - that is colour-patches tha...

1 day ago | 0

Answered

1-D Transient Heat Conduction With No Heat Generation [FDM] [Crank-Nicholson]

My suggestion is that you add a line: Tall(:,k) = Tb; at the end of your "time-step"-loop. Then after you're done with it all...

1-D Transient Heat Conduction With No Heat Generation [FDM] [Crank-Nicholson]

My suggestion is that you add a line: Tall(:,k) = Tb; at the end of your "time-step"-loop. Then after you're done with it all...

1 day ago | 1

Answered

Transposing matrices of a Dataset

Take a look at the help and documentation of the matlab-function permute. HTH

Transposing matrices of a Dataset

Take a look at the help and documentation of the matlab-function permute. HTH

2 days ago | 0

Answered

Inversion of block tridiagonal matrices

If you have a small enough problem which is not ill-conditioned just use \, if it is ill-conditioned but you can do an SVD of yo...

Inversion of block tridiagonal matrices

If you have a small enough problem which is not ill-conditioned just use \, if it is ill-conditioned but you can do an SVD of yo...

2 days ago | 0

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Answered

Matlab is installed in ubuntu but i am unable to open it

If you try to execute something like ./matlab from your terminal you tell the shell to run an executable command "matlab" in the...

Matlab is installed in ubuntu but i am unable to open it

If you try to execute something like ./matlab from your terminal you tell the shell to run an executable command "matlab" in the...

2 days ago | 1

Answered

How to find peaks of the given signal and find the phase shift with respect to the Oscillator 1 signal?

If you had regularly sampled data (it doesn't seem so) this would best be done with spectrogram. That would give you the spectro...

How to find peaks of the given signal and find the phase shift with respect to the Oscillator 1 signal?

If you had regularly sampled data (it doesn't seem so) this would best be done with spectrogram. That would give you the spectro...

5 days ago | 0

Answered

How to solve the reduced eigenvalue poblem

Have a look at the eig function. It solves for eigenvalues-eigenvectors - also for the generalized eigenvalue-problem you seem t...

How to solve the reduced eigenvalue poblem

Have a look at the eig function. It solves for eigenvalues-eigenvectors - also for the generalized eigenvalue-problem you seem t...

5 days ago | 0

Answered

Plot signal from fits file?

To read data in fits-format you can use fitsread and fitsinfo, but when I try that on an image from SETI-projects web-site I got...

Plot signal from fits file?

To read data in fits-format you can use fitsread and fitsinfo, but when I try that on an image from SETI-projects web-site I got...

7 days ago | 0

Answered

How to make a plot with x-axis that has different scales on different specific regions?

Either you can use something like set(gca,'xscale','log') if that brings you close enough. If you want to plot on some other ...

How to make a plot with x-axis that has different scales on different specific regions?

Either you can use something like set(gca,'xscale','log') if that brings you close enough. If you want to plot on some other ...

8 days ago | 1

| accepted

Answered

Avoid ''Dot indexing is not supported for variables of this type.'', exist(...) isn't working

If you want to check if a struct has a field your're interested in you should check with isfield, check the help and documentati...

Avoid ''Dot indexing is not supported for variables of this type.'', exist(...) isn't working

If you want to check if a struct has a field your're interested in you should check with isfield, check the help and documentati...

8 days ago | 0

Answered

editing the JET colormap

You should be able to do something like this: imagesc(peaks(123)) cx = caxis; n_colors = 128 cmp = jet(n_colors); colorbar ...

editing the JET colormap

You should be able to do something like this: imagesc(peaks(123)) cx = caxis; n_colors = 128 cmp = jet(n_colors); colorbar ...

9 days ago | 1

| accepted

Answered

How can I check that a newly generated sequence is already in the existing structure list or not?

For example this can be used: intersect([1 2 3;1 3 2;2 1 3;2 3 1;3 1 2],[3 2 1],'rows') % %ans = % % 0x3 empty double matr...

How can I check that a newly generated sequence is already in the existing structure list or not?

For example this can be used: intersect([1 2 3;1 3 2;2 1 3;2 3 1;3 1 2],[3 2 1],'rows') % %ans = % % 0x3 empty double matr...

9 days ago | 0

Answered

2d interpolation from a non-uniform grid

No you can use griddata and scatteredInterpolant. You can do something like this: Zi = griddata(X(:),Y(:),Z(:),Xi,Yi); And you...

2d interpolation from a non-uniform grid

No you can use griddata and scatteredInterpolant. You can do something like this: Zi = griddata(X(:),Y(:),Z(:),Xi,Yi); And you...

9 days ago | 0

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Answered

How could I use MATLAB to solve for x with this equation, 0=a*x^(3)+b*x^(-1)+c.

This works perfectly fine: f = @(x ) -58.8*(550) + 0.5*37*0.002377*x.^3.*(0.02+0.062*((2*960)./(0.002377*37*x.^2)).^2); plo...

How could I use MATLAB to solve for x with this equation, 0=a*x^(3)+b*x^(-1)+c.

This works perfectly fine: f = @(x ) -58.8*(550) + 0.5*37*0.002377*x.^3.*(0.02+0.062*((2*960)./(0.002377*37*x.^2)).^2); plo...

10 days ago | 0

Answered

Please help me convert them into a function of theta

When you get such an error, your first action would be to look at the sizes of the variables you use: whos r wab L r theta Nex...

Please help me convert them into a function of theta

When you get such an error, your first action would be to look at the sizes of the variables you use: whos r wab L r theta Nex...

10 days ago | 0

Answered

ODE 45 range for the variables

If you want to start your ode-integration at an [x,T]-point of [0,298] you have to define your y0 like this: y0=[0 ; 298]; %ini...

ODE 45 range for the variables

If you want to start your ode-integration at an [x,T]-point of [0,298] you have to define your y0 like this: y0=[0 ; 298]; %ini...

11 days ago | 0

Answered

Matrix product and inversion speed up

My comment still seems relevant. A simple commandline test gives: tic,AA = ones(3e4,2)*(ones(2,3e4)*ones(3e4,1));toc % Elapsed...

Matrix product and inversion speed up

My comment still seems relevant. A simple commandline test gives: tic,AA = ones(3e4,2)*(ones(2,3e4)*ones(3e4,1));toc % Elapsed...

15 days ago | 0

Answered

Getting an unknown error on calculating Standard Deviation.

Your variable v is a uint8. Try: std(double(v)) HTH

Getting an unknown error on calculating Standard Deviation.

Your variable v is a uint8. Try: std(double(v)) HTH

15 days ago | 0

Answered

Evaluate the triple integral and sketch the given solid

Whenever you are faced with a problem to solve start trying to solve it with the methods at hand. 1, You surely know how to do ...

Evaluate the triple integral and sketch the given solid

Whenever you are faced with a problem to solve start trying to solve it with the methods at hand. 1, You surely know how to do ...

15 days ago | 0

Answered

How to make a double integration with numerical integration?

Why not use integral2 to integrate over 2-D domains - it can handle, at least, boundaries in the y-direction that are functions ...

How to make a double integration with numerical integration?

Why not use integral2 to integrate over 2-D domains - it can handle, at least, boundaries in the y-direction that are functions ...

16 days ago | 0

Answered

How to show a deformation of a sphere

Keep track of the x, y, and z-lims or the axis-limits. Something like this: tiledlayout(1,2); [X, Y, Z] = ellipsoid(0,0,0,1,1,...

How to show a deformation of a sphere

Keep track of the x, y, and z-lims or the axis-limits. Something like this: tiledlayout(1,2); [X, Y, Z] = ellipsoid(0,0,0,1,1,...

16 days ago | 0

| accepted

Answered

ODE system with variable parameter, Boundary conditions and domain

This could be done something like this: Dall = {0:0.1:1,0:0.1:2}; % however many domains you need etc Y0 = {[Tt01;Pt01;M01],[T...

ODE system with variable parameter, Boundary conditions and domain

This could be done something like this: Dall = {0:0.1:1,0:0.1:2}; % however many domains you need etc Y0 = {[Tt01;Pt01;M01],[T...

16 days ago | 0

| accepted

Answered

Integrate PDEPE solution wrt x

This rather straightforward method should get the job done (assuming you cannot get away with simply use trapz, or cumtrapz, but...

Integrate PDEPE solution wrt x

This rather straightforward method should get the job done (assuming you cannot get away with simply use trapz, or cumtrapz, but...

17 days ago | 0

| accepted

Answered

How to calculate |x|

abs(x) When you look for functions you should learn about the matlab-command lookfor, have a look at the help and documentation...

How to calculate |x|

abs(x) When you look for functions you should learn about the matlab-command lookfor, have a look at the help and documentation...

19 days ago | 0

Answered

Curve fitting of two different datasets with two different equations and parameters to compare

This is why I never use the fancy curve-fitting-gui-tool, but do it explicitly with fminsearch or lsqnonlin. That way I have mor...

Curve fitting of two different datasets with two different equations and parameters to compare

This is why I never use the fancy curve-fitting-gui-tool, but do it explicitly with fminsearch or lsqnonlin. That way I have mor...

20 days ago | 0

| accepted

Answered

How to solve exponential distribution equation using symbolic Matlab?

It helps the int if you explicitly tells what the range to integrate over is: int(f,0,inf) HTH

How to solve exponential distribution equation using symbolic Matlab?

It helps the int if you explicitly tells what the range to integrate over is: int(f,0,inf) HTH

21 days ago | 0

| accepted

Answered

Sturm-Liouville eigenvalues calculation

Have you checked the file-exchange contribution: discrete-orthogonal-polynomial. It solves this kind of problems numerically.

Sturm-Liouville eigenvalues calculation

Have you checked the file-exchange contribution: discrete-orthogonal-polynomial. It solves this kind of problems numerically.

21 days ago | 0

Answered

common tangent of two curves with vpasolve.

In your code you gove starting-points for the variable you search for. Perhaps vpasolve doesn't bother to look for all solutions...

common tangent of two curves with vpasolve.

In your code you gove starting-points for the variable you search for. Perhaps vpasolve doesn't bother to look for all solutions...

22 days ago | 0

| accepted

Answered

How to add arrows in plotted curves to point corresponding axis?

There are a number of arrow-contributions on the file exchange. These two are my favourites: arrow3, arrow, other contributions ...

How to add arrows in plotted curves to point corresponding axis?

There are a number of arrow-contributions on the file exchange. These two are my favourites: arrow3, arrow, other contributions ...

22 days ago | 1

Answered

How to use wiener filter?

If you read the help for deconwnr you see that there is a third input, NSR, for the image Noise-to-Signal-Ratio. Since the Wiene...

How to use wiener filter?

If you read the help for deconwnr you see that there is a third input, NSR, for the image Noise-to-Signal-Ratio. Since the Wiene...

22 days ago | 0

| accepted