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Jan


Last seen: Today
13.653 total contributions since 2009

It is easier to solve a problem than to guess, what the problem is.

Questions about FileExchange submissions are welcome - get my address from the code. I do not answer mails concerning questions in the forum.

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Answered
How to find position a input
z(m,n,i,ii) = (x(m)).^4'* sin(y(n)).^3'*cos(xx(i)).^2'*(yy(ii)); % Voodoo: ^ ^^ ^ ^ ^ ^ ^ ^ ...

ongeveer 17 uur ago | 0

Answered
Why do I receive this error message?
The message seems to be clear already. Some graphic output let the graphics driver crash. Follow the instructions given in the m...

ongeveer 17 uur ago | 0

Answered
How to create a struct
str_rock = sprintfc('ROCK%d', rock_code); % Undocumented ROCK = cell2struct(str_rock(:), sub_rock(:));

ongeveer 17 uur ago | 0

Answered
I am getting Index exceeds the number of array elements(1) error?
With guessing where the error occurs: dv_dt_p = -v(j)*dv_dx-(1/gamma)*((dt_dx)+(t(j)/rho(j))*drho_dx); dt_dt_p = -v(j)...

ongeveer 19 uur ago | 1

Answered
How to speed up my code?
if ismember(selectedBus, InjBus_moreZeroLines) ismember replies a vector, if the inputs are vectors. The if command requires a ...

ongeveer 20 uur ago | 0

Answered
Error loading matlabprefs.mat
If removing the file helps for some time, a function is destroying the file. Then an approach is to scan, who is accessi ng the ...

ongeveer 20 uur ago | 0

Answered
Can I put an fprint statement in a saveas command?
folder = 'D:\Your\Output'; n = 4; saveas(FigH, fullfile(folder, sprintf('File%03d.eps', n))); This creates the file: D:\...

2 dagen ago | 0

Answered
How to extact bits from an image to a string separated with commas?
Your code produces a CHAR vector (a "string" is a different class). Now you explain, that there is an error, when you "try to op...

2 dagen ago | 0

Answered
How to sum over indices i+j=k without using a for loop?
Because beta is determined inside the for i and for j loops, we can improve only the inner loops: r = 501; kmax = 501; p ...

2 dagen ago | 0

Answered
Rotate 3D matrix
X = rand(2, 3, 4); Y1 = permute(X, [3,1,2]); size(Y1) Y2 = permute(X, [3,2,1]); size(Y2) By the way, "matrix" means 2D by ...

2 dagen ago | 0

Answered
How do I get execute while else loop?
The == operator compares its arguments elementwise. This works only if one of the array is a scalar or if bother have the same s...

3 dagen ago | 0

Answered
Array Exponentials without For Loop?
A = [1 2 3]; B = [2 3]; C = A .^ (B.')

3 dagen ago | 1

| accepted

Answered
Safely interrupt a script/function
You can open a small window, which contains a stop button. Pressing this button sets a local variable, which can be checked from...

6 dagen ago | 0

Answered
Open image in Gui from menu
Unrecognized property 'XLim' for class 'matlab.graphics.primitive.Image'. XLim belongs to the axes. In the line: handles.Image...

6 dagen ago | 0

Answered
How to operate properly with multidimensional matrices and cells.
"For the other two, however, it goes wrong:" No, nothing goes wrong. This is exactly what is expected and needed. Only the dis...

6 dagen ago | 0

| accepted

Answered
Help needed in solving a matrix equation
A= [0,1;1,1]; B= [0,1;1,1]; Q= [2,0;0,4]; R= [0.5,0;0,0.25]; syms p11 p12 p21 p22 P = [p11, p12; p21, p22]; eqn = P * A + ...

8 dagen ago | 1

Answered
I dont know what to do
Remove the semicolons from these lines: x; y1; y2; y3; y4; The trailing semicolon suppresses the output. Therefore "x;" sh...

8 dagen ago | 1

Answered
FiltFilt function giving NaN values
I try to run your code guessing some inputs: srate = 1000; [b, a] = ellip(14, 5, 30, 2*(170/srate), 'low'); lpfSig = filtfil...

9 dagen ago | 0

Answered
How to insert data with fopen ?
fmt = [repmat('%.2f ', 1, 32). '\n']; ftempd = fopen('tempd.r2c', 'w'); fprintf(ftempd, fmt, tempd.'); fclose(ftempd);

9 dagen ago | 0

Answered
Run into "Paused: Press any key"
This problem appeared in R2016a already: https://www.mathworks.com/matlabcentral/answers/278430-why-does-program-execution-hang-...

10 dagen ago | 0

Answered
Formating all values of a structure field
No, you cannot access nested fields of a struct array in Matlab directly. You need a loop.

10 dagen ago | 0

| accepted

Answered
Cheat for preallocation requirement
x = []; for i = 1:1e5 x(end+1, :) = 1:10; end Here you allocate sum(1:1e5) * 10 * 8 bytes: 400 GB. c = {}; for i=1:1e5...

10 dagen ago | 0

Answered
the user will be asked to input number which is good but the problem is how can I make that as numbers and letters for example 2x and put it in matrix
This is a really complicated task, which is prone to bugs. How do you want to treat "2x" compared to "x2"? If "x" is a variable,...

10 dagen ago | 0

Answered
Subtract 1 from variable each second
counter = 100; TimerH = timer('TimerFcn', @doCount, 'ExecutionMode', 'fixedRate', ... 'Period', 1.0, 'UserData', counter...

10 dagen ago | 0

| accepted

Answered
Copy Multiple figures to the clipboard
The OS has a single clipboard only. There are some 3rd party apps, which offer more bins in the clipboard, but it is not easy to...

10 dagen ago | 0

Answered
How do I store the values of a for loop in a matrix array?
One solution might be indexing the output ... mat(u, u0, v, v0) = delta2(u, u0, v, v0); ... But this can be simplifi...

11 dagen ago | 0

Answered
Recover Corrupt Matlab File
What do you call "Matlab files"? which file extension do they have? M, P, MAT, MLX, ...? Based on the information "random chara...

11 dagen ago | 0

| accepted

Answered
Concatenating multiple cells in a single matrix
The conversion from numeric to string and back to numeric is an expensive indirection. n = 8; % p = uint64(2).^(0:n-1); % LSB...

11 dagen ago | 0

Answered
An UndefinedFunction error thrown by parfor but not for
Constants defined in scripts cannot be identified by the Matlab, when it parses the parfor block. In addition such scripts have ...

11 dagen ago | 3

| accepted

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