Jan

Last seen: 1 day ago

12,596 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.

Jan's Badges

View details...

Answered
Random draw without re-delivery in a loop
What are your input data? A list of files stored in a folder? (As usual: please explain this instead of letting the readers gues...

2 days ago | 0

| accepted

Answered
search in large cell file
In the loop all lines are stored in the cell an the loops stops, if the last one was not a CHAR. This means, that the last eleme...

3 days ago | 1

| accepted

Question

MEX api and interleaved complex arrays
Does MATLAB store complex data in interleaved format since R2018a? If you compile a MEX function with the -R2018a flag, you can...

6 days ago | 1 answer | 0

1

answer

Answered
Reversible matrix in matlab
You want to identify a "regular matrix and non-singular matrix". Then testing only, if it is square and not a zero matrix ist no...

10 days ago | 0

Answered
Calculation precision changed in 2020b?
The ACOS function is numerically instable at 0 and pi. SUM is instable at all. A trivial example: sum([1, 1e17, -1]) .There are...

10 days ago | 1

Answered
Why stock DOT function is suboptimally implemented
Just a comment: Under Matlab 2018b, Core i5-3320M CPU @ 2.60GHz: Elapsed time is 0.249669 seconds. dot(z,z) Elapsed time is ...

10 days ago | 0

Answered
How to concatenate matrices to calculate mean
As Steven has mentioned already, this is the main problem: "I have 40 matrices DJF1979_1980_125 to DJF2019_2020_125" Do not us...

10 days ago | 0

Submitted

ScaleTime
Fast linear interpolation of equally spaced data (C-MEX and M)

10 days ago | 19 downloads |

Answered
How to read data from a file into cell array keeping indents undisturbed
% Import file: Str = fileread('file.ext'); % Remove trailing line break to avoid appending an additional empty line: if ~is...

1 month ago | 0

| accepted

Answered
Not enough input arguments error
What about replacing: for j= 1:N if x(j)<beta1 & x(j)>beta2 f(1,j)=f02(x(j)); end if x(j)>beta1 & x(j)<...

1 month ago | 0

Answered
command window no output
Check if you have shadowed the display function: w = cellstring(which('display', '-all')); fprintf('%s\n', w{:}) What do you ...

1 month ago | 0

Answered
Find string in the special file
S = fileread('R2_AS - Copy.txt'); i1 = [strfind(S, 'Szenario'), Inf]; i2 = strfind(S, 'has been created.'); width = numel(...

2 months ago | 0

Answered
Namelengthmax value in different operating systems
The value of namelengthmax depends on the Matlab version only. It is the same for all operating systems. Identifiers can have ...

2 months ago | 0

Answered
Syntax Error using Fcn Block
You need round parentheses for indexing, not square brackets: (1/Mus)*(Ks*(u[3]-u[4])+Ct*(u([7]-u[2])+Kt*(u[6]-u[4])-u[5]) % =...

2 months ago | 0

| accepted

Answered
how to compute the number of image from subfolder ?
fullfile(('.\databasee\')) is exactly the same as its input: '.\databasee\'. The unnecessary parentheses are confusing only. To...

2 months ago | 1

| accepted

Answered
Different machine precision for scalars and vectors?
The only difference is the display in the command window. Matlab tries to display vectors in an abbreviated format, execpt if yo...

2 months ago | 1

| accepted

Answered
Strange behavior of the editor in the forum
1.5 years later. I tried it again. I still cannot set a flag, delete an answer or insert an image or link. Whenever I try it, t...

2 months ago | 2

Answered
Combining 2 codes to make a number counter with user input
function v = Sample() Loop = true; Count = 0; v = []; while Loop a = input('Please input a number: '); if a >= ...

2 months ago | 0

Answered
regarding 'FOR LOOP' use to plot discrete impulse response
The question is not clear yet. Do you mean: delay = repmat(1, 1, 500); amplitiudes = repmat(0.1, 1, 500); % Alternati...

2 months ago | 0

Answered
How can write loop for this algorithm?
I'm not sure, because the question is not completely clear to me. Perhaps: A = [1 1 2 2 3 3 3 4 4 8 9 10]; d = diff(A); v = f...

2 months ago | 0

Answered
counting number of textbox or patches in a matlab figure
% All text boxes: List1 = findall(HandleOfFigure, 'Type', 'uicontrol', 'Style', 'text') Count1 = numel(List1) % All patche...

2 months ago | 0

Answered
mlock not working, variables getting cleared in function switch.
Create this file: function demo(In) persistent v switch lower(In) case 'lock' mlock disp('locked'...

2 months ago | 0

Answered
nested k for loops for a parameter k
Start with simplyfying your code: Replace the 2 innermost loops: s = 0; for u1=1:2 for u2=1:2 s = s + t1(u1,v1,w1)*...

2 months ago | 1

| accepted

Answered
Adding Two Arrays Alternatively to make Third Array
% Arbitrary test data: ForceX = rand(64, 1) + 1i * rand(64, 1); ForceY = rand(64, 1) + 1i * rand(64, 1); % Methode 1: Forc...

2 months ago | 0

Answered
how to string scalar or character vector a text
You need Matlab R2018b to define stringe with double quotes. The screen shot looks like R2018a. Then use single quotes to create...

2 months ago | 0

Answered
why elseif (i==1) && j==m condition went unexecuted?
The condition "i==1 && j==m" appears twice: if i==1 && j==m % First time A(1,1)=1; elseif (i==...

2 months ago | 0

| accepted

Answered
What font do you code in?
Andale Mono and Bitstream Vera Sans Mono.

3 months ago | 1

Answered
Why Matlab does not read the input value?
This piece of code is called repeatedly. This shown code seems to be fine, so the behavior is caused the code, which calls this ...

3 months ago | 0

Answered
uiopen vs audioread, is there an advantage to one over the other for .wav files?
The function uiopen and audioread have two different jobs. While the first opens Matlab files with the apropriate application, t...

3 months ago | 0

Answered
Slow SizeChangedFcn or ResizeFcn
The first version was not sufficient in all cases. In addition it is required to prevent a repeated entering of the code: funct...

3 months ago | 0