Answered

Local macro in STATA?

That is generally a poor programming pattern (read this as: "This is a really poor idea!"). You should aim to write your code su...

Local macro in STATA?

That is generally a poor programming pattern (read this as: "This is a really poor idea!"). You should aim to write your code su...

ongeveer 20 uur ago | 0

Answered

function for addition 2^16 modulo

Just make sure that your ints a and b are in int32 or larger number of bit-formats, then use: C = mod(a+b,2^16) HTH

function for addition 2^16 modulo

Just make sure that your ints a and b are in int32 or larger number of bit-formats, then use: C = mod(a+b,2^16) HTH

1 dag ago | 1

Answered

how do I classify image based on smoothness and high frequency?

For measure of smoothness I'd go with something like this: d2I = del2(I); % laplacian of your image (grayscale, double). From ...

how do I classify image based on smoothness and high frequency?

For measure of smoothness I'd go with something like this: d2I = del2(I); % laplacian of your image (grayscale, double). From ...

2 dagen ago | 0

Answered

Horizontal First Differencer on a Matrix

Have a look on the help and documentation to diff. For this case use: y = diff(x,[],2); % or explicitly 1st difference: y = d...

Horizontal First Differencer on a Matrix

Have a look on the help and documentation to diff. For this case use: y = diff(x,[],2); % or explicitly 1st difference: y = d...

3 dagen ago | 0

| accepted

Answered

How to remove space between subplots of heatmaps?

If you use the axes-handle output from subplot you can then set any of their properties as you desire: sph = subplot(3,1,1); %...

How to remove space between subplots of heatmaps?

If you use the axes-handle output from subplot you can then set any of their properties as you desire: sph = subplot(3,1,1); %...

3 dagen ago | 0

Answered

If a structure exists in a file

You can explicitly check for the existense of a variable in a .mat-file: qwe = whos('-file','your-filename.mat','cDA_External_S...

If a structure exists in a file

You can explicitly check for the existense of a variable in a .mat-file: qwe = whos('-file','your-filename.mat','cDA_External_S...

3 dagen ago | 0

| accepted

Answered

help debugging 3-D plot code

You have to get your equations for x, y and z right: x = a*cos(phi).*sin(theta); y = b*sin(phi).*sin(theta); z = b*cos(theta)...

help debugging 3-D plot code

You have to get your equations for x, y and z right: x = a*cos(phi).*sin(theta); y = b*sin(phi).*sin(theta); z = b*cos(theta)...

3 dagen ago | 1

| accepted

Answered

Combined mean monthly values from 24 years of monthly data

Something like this perhaps: BV = table2array(baseline_values); clf subplot(2,1,1) imagesc(reshape(BV(:,4),12,[])') % Illust...

Combined mean monthly values from 24 years of monthly data

Something like this perhaps: BV = table2array(baseline_values); clf subplot(2,1,1) imagesc(reshape(BV(:,4),12,[])') % Illust...

4 dagen ago | 0

Answered

Plotting negative values on an histogram

It seems likely that you've mixed up BinCounts and BinEdges - it doesn't make much sense to have a negative number of something ...

Plotting negative values on an histogram

It seems likely that you've mixed up BinCounts and BinEdges - it doesn't make much sense to have a negative number of something ...

4 dagen ago | 0

Answered

M-point averaging filter to an image

Read the help and documentation for conv2. HTH

M-point averaging filter to an image

Read the help and documentation for conv2. HTH

4 dagen ago | 0

Answered

Why doesn't the ode15s solver work when I switch 'k1q','k2q','k12q' from a single value into vectors(more values)?

When k1q is an array you will get an error when you try to assign the product of that array with the scalar C(1) to dCdt(1) whic...

Why doesn't the ode15s solver work when I switch 'k1q','k2q','k12q' from a single value into vectors(more values)?

When k1q is an array you will get an error when you try to assign the product of that array with the scalar C(1) to dCdt(1) whic...

4 dagen ago | 1

| accepted

Answered

i am getting error in line 18 of invalid use of operator.please help me solving this

OK, so you want to solve 3 coupled equations of motion for some harmonically varying solution. First you have to understand the ...

i am getting error in line 18 of invalid use of operator.please help me solving this

OK, so you want to solve 3 coupled equations of motion for some harmonically varying solution. First you have to understand the ...

6 dagen ago | 0

Answered

make a better map

You should try: shading flat instead of the interp option. You will have to accept the fact that you only have data in a 32-by...

make a better map

You should try: shading flat instead of the interp option. You will have to accept the fact that you only have data in a 32-by...

6 dagen ago | 0

| accepted

Answered

Solving differential equations to get accurate plot as shown.

Since you get an oscillatory behaviour of (primarily) Cecm and Crec it is very likely that you have a bug for some of the reacti...

Solving differential equations to get accurate plot as shown.

Since you get an oscillatory behaviour of (primarily) Cecm and Crec it is very likely that you have a bug for some of the reacti...

6 dagen ago | 0

Answered

How to use chebop function?

Have you installed the chebfun package? Have you added the chebfun install directory to the matlab-path? If you have it install...

How to use chebop function?

Have you installed the chebfun package? Have you added the chebfun install directory to the matlab-path? If you have it install...

7 dagen ago | 0

| accepted

Answered

Improving speed of readtable

It is a rather large data-file to read. You might reduce the read-time if you use load instead of readtable - that should reduce...

Improving speed of readtable

It is a rather large data-file to read. You might reduce the read-time if you use load instead of readtable - that should reduce...

7 dagen ago | 0

Answered

How to create and plot an oloid in MATLAB

Have a look at the help and documentation of the convhull function. That should give you a solution for this task - in the sense...

How to create and plot an oloid in MATLAB

Have a look at the help and documentation of the convhull function. That should give you a solution for this task - in the sense...

7 dagen ago | 0

Answered

Multidimensional integration in matlab

Have a look at the help and documentation for integral2. That should be the function to do 2-D integrals, that sounds like the f...

Multidimensional integration in matlab

Have a look at the help and documentation for integral2. That should be the function to do 2-D integrals, that sounds like the f...

8 dagen ago | 1

Answered

Why does version R2020b gives errors when running functions such as fmincon, when version R2019a runs properly.

Have you installed the optimization toolbox in your 2020b install? If not that is where that function resides. Check the existe...

Why does version R2020b gives errors when running functions such as fmincon, when version R2019a runs properly.

Have you installed the optimization toolbox in your 2020b install? If not that is where that function resides. Check the existe...

8 dagen ago | 0

| accepted

Answered

Simulation of Shepp Logan phaton dataset

The phantom-function is a standard .m-function available in source-code, so you can read it clean and plain. It is simply a func...

Simulation of Shepp Logan phaton dataset

The phantom-function is a standard .m-function available in source-code, so you can read it clean and plain. It is simply a func...

9 dagen ago | 2

Answered

Different line types for multiple curves

Maybe you'll have to accept looping a little: lstl = {'-','--'}; for i1 = 1:4, set(p(i1),'linestyle',lstl{rem(i1,2)+1}) en...

Different line types for multiple curves

Maybe you'll have to accept looping a little: lstl = {'-','--'}; for i1 = 1:4, set(p(i1),'linestyle',lstl{rem(i1,2)+1}) en...

12 dagen ago | 0

| accepted

Answered

Inputs must be floats, namely single or double.

When you integrate an ODE numerically there is no need whatsoever to introduce a declaration of T as a symbolic variable (the wa...

Inputs must be floats, namely single or double.

When you integrate an ODE numerically there is no need whatsoever to introduce a declaration of T as a symbolic variable (the wa...

12 dagen ago | 1

Answered

error occurring while solving odes using ode15s

Check your mass-matrix E and make sure it looks exactly like you expect. The 3 off-diagonal 1s looks peculiar to me. Then you ha...

error occurring while solving odes using ode15s

Check your mass-matrix E and make sure it looks exactly like you expect. The 3 off-diagonal 1s looks peculiar to me. Then you ha...

13 dagen ago | 0

| accepted

Answered

Find Peaks error - Expected X to be strictly increasing

Check that your X-variable is actually monotonically increasing (you might have replicate points, which then messes everything u...

Find Peaks error - Expected X to be strictly increasing

Check that your X-variable is actually monotonically increasing (you might have replicate points, which then messes everything u...

14 dagen ago | 0

Answered

The legend does not show the right marker:

When using legend it is always preferable to use an array of handles returned from the plotting functions. Try something like: ...

The legend does not show the right marker:

When using legend it is always preferable to use an array of handles returned from the plotting functions. Try something like: ...

15 dagen ago | 0

| accepted

Answered

stft for complex data

Shouldn't that be as simle as: Acmplx = I + 1i*Q; spec = fft(Acmplx); % or spectrogram etc HTH

stft for complex data

Shouldn't that be as simle as: Acmplx = I + 1i*Q; spec = fft(Acmplx); % or spectrogram etc HTH

15 dagen ago | 0

Answered

How do I interpolate in 5d?

Have a look at the help and documentation for interpn. HTH

How do I interpolate in 5d?

Have a look at the help and documentation for interpn. HTH

15 dagen ago | 0

Answered

Sparse matrix from the columns of an initial matrix

Something like this might work: vals = []; idx1 = []; idx2 = []; for j = 1:n idx1 = [idx1,1:n]; c...

Sparse matrix from the columns of an initial matrix

Something like this might work: vals = []; idx1 = []; idx2 = []; for j = 1:n idx1 = [idx1,1:n]; c...

16 dagen ago | 0

Answered

Is there a way to adaptively sample 2-D surfaces ?

It is not entirely clear what your "problem situation" or "design desires" are. These might be very important for what type of s...

Is there a way to adaptively sample 2-D surfaces ?

It is not entirely clear what your "problem situation" or "design desires" are. These might be very important for what type of s...

16 dagen ago | 0

Answered

Error using odearguments (line 21) When the first argument to ode23s is a function handle, the tspan argument must have at least two elements.

Your t variable will only have one component as you define it. My guess is that you want 100 elements between 0 and 1. If that's...

Error using odearguments (line 21) When the first argument to ode23s is a function handle, the tspan argument must have at least two elements.

Your t variable will only have one component as you define it. My guess is that you want 100 elements between 0 and 1. If that's...

26 dagen ago | 0

| accepted