Community Profile # Jan

Last seen: Today Active 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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Dimensions of arrays being concatenated are not consistent.
The message means, that you cannot concatente arrays horizontally, if they have a different number of rows. Or vertically, if th...

etwa 20 Stunden ago | 0

Create cell array of handle functions, which have been created from 2x1 double arrays
a = [1; 2]; b = [3; 4]; f = cell(2, 1); for ff = 1:2 f{ff} = str2func(sprintf('@(t) %d * t + %d', a(ff), b(ff))); end f

ein Tag ago | 0

| accepted

changing the legend line style (":","-","--","-.") for 4 black lines in plot instead of using multip colour
figure; axes('NextPlot', 'add', ... 'LineStyleOrder', cellstr([":", "-", "--", "-."]), ... 'ColorOrder', zeros(1, 3))...

2 Tage ago | 0

Finding Sequences of 1's values
Some timings of the methods provided in this thread: x = randi([0, 1], 1, 80000); format long g disp(timeit(@() Jos(x))) d...

4 Tage ago | 0

unix/system comand Always print out some environment setting when using it
% Without semicolon: system('pwd') % With semicolon: system('pwd'); % With semicolon and catching outputs: [status, out] = ...

4 Tage ago | 0

Is there a reason why row vectors are default in Matlab?
Matlab was developped as "Matrix Laboratory". So the default type is a double matrix. If the focus has been set to vectors, it w...

5 Tage ago | 0

Translate file name in mapped drive to unc path filename
No, there is no Matlab command to perform this automatically. net use sovles this and WMIC can help also: [status, out] = syst...

5 Tage ago | 0

How to efficiently allocate memory using a parfor loop
ET = permute(E_mat, [2,3,1]); Q = zeros(size(ET)); parfor n = 1:size(E_mat, 3) Q(:,:,n) = sigmaE(n) / 2 / mass_density(n...

5 Tage ago | 1

| accepted

exportgraphics does not save at specific location
The folder is existing but Matlab cannot create a file in it. Then Matlab does not have write permissions in this folder. filea...

5 Tage ago | 0

merge many mat files in one big vector
Why do you overwrite the first part of PSD_Monat in each iteration? for k=1 PSD_Monat([1:k*f1],1)=d(:,1) %d([1:k*f1],1)...

6 Tage ago | 0

Is it possible to run Matlab Deep Learning Toolbox functions in Octave?
No. For 2 reasons: It is not 100% compatible (I'm sure!). The license conditions will not allow this. If you do have a license...

6 Tage ago | 1

| accepted

Min of each column of a sparse matrix?
For large inputs a loop is faster than accumarray: X = sprand(2000, 20000, 0.2); tic; for k = 1:10 [ii,jj] = find(X); ...

6 Tage ago | 0

simplify my script?
Move all repeated work out of the loops. In your case: % Load data ncfile = 'Temperature.nc'; months = {'January'...

6 Tage ago | 0

generate sine waves that appears after one another
figure; % Insert this: axes('NextPlot', 'add'); % Equivalent to: hold('on') ... Otherwise the plot() command clears it...

6 Tage ago | 0

Function not processing dat for each element in array
Remember, that Matlab's IF condition must be a scalar. If you provide n as a vector, the line: if n >= 50 implicitly perfo...

7 Tage ago | 1

Is there any equivalent keyword 'goto' in matlab not in simulink but in matlab coding
No, there is no GOTO in Matlab and it should be avoided strictly in good code. Maybe: function YourFunc n = 123; % ??? for ...

7 Tage ago | 0

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Storing output of function file in workspace
Nested nested functions - brrr. What about: t = 0.3:0.1:6; ? You store the variable Cfit in the workspace of the function Pa...

7 Tage ago | 0

Fields names cannot contain the charcater '#' . fld = sprintf('File_%d', i); Data.(fld) = readmatrix(Files2Read{i}); ...

7 Tage ago | 0

| accepted

Need some help with re-formating a text.file using MATLAB?
Actually all you want to do is to replace the string a = sprintf('''10''\n') % by b = sprintf('''10'' good ') and c = sp...

10 Tage ago | 0

how to make timer callback function?
app.something = 'hello'; tt = timer('Name','Test','Period',1, ... 'ExecutionMode','fixedSpacing','BusyMode','drop'); tt.Ti...

10 Tage ago | 0

| accepted

A network license is designed to work inside the specified network only. This is its nature. So you are asking for a break of th...

10 Tage ago | 0

is it possible to use "for loop" for matrix?
X1 = zeros(1,6); X2 = zeros(1,6); for k=1:6 for j=1:n X1(1,k)=(j^k)+X1(1,k); X2(1,k)=(j^k)+X2(1,k); ...

10 Tage ago | 1

| accepted

How to make 3 arrays (Test , Test2, Test3) that are of different lengths into one matrix?
A matrix is a rectangular list of elments. This means, that all rows must have the same number of elements. Either fill the sho...

10 Tage ago | 1

| accepted

how to use multiple 'for loop' for one function?
Please post the complete error message, if you mention an error. This message contains the information, in which line the proble...

10 Tage ago | 0

| accepted

Iterating inside an iteration loop, while loop
This is not a bug, but useful for efficient code: 10^(-4) is an expensive power operation while 1e-4 is a cheap constant. if Z...

10 Tage ago | 0

Compatibility of code when updating Matlab licence
See: https://www.mathworks.com/support/requirements/matlab-system-requirements.html R2021b supports Windows 7 SP1, while Win7 i...

10 Tage ago | 1

Vectorize comparing a column vector in a matrix to all other vectors in the matrix.
Why do you want to vectorize this code? I assume, this will cause a slow down, because this creates large temporary array, which...

11 Tage ago | 0

| accepted

Share global variables between windows App Designer
Global variables are a mess in every case. Sending the data through a well defined interface would be much better. Do not use "...

11 Tage ago | 0

| accepted