Community Profile

photo

Jan


12 477 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

  • Grand Master
  • Revival Level 4
  • 36 Month Streak
  • Thankful Level 4
  • Knowledgeable Level 4
  • First Answer
  • Promoter
  • Commenter
  • Solver

View details...

Contributions in
View by

Answered
How to rename all instances of persistent variables?
Simply remove the persistent command temporarily, rename the variable and insert persistent again. You can open the file e.g. ...

1 jour ago | 0

| accepted

Answered
Delete table from GUI app variable
Perhaps you mean:tcell2{t,s}=final; delete(app.table)

1 jour ago | 0

Answered
How to update variable names after a "clear"
Clearing variables is rarely useful in Matlab, but a waste of time only. So on one hand it is not exactly clear, what you are as...

1 jour ago | 0

Answered
Variable is not fully defined on some execution paths.
Does this help? tcell2 = cell(10,10); for t = 1:10 for s = 1:10 tcell2{t,s} = imcrop(pic2, ... [(t-...

1 jour ago | 0

Answered
How to select numbers?
F = rand(1,400); M = rand(1,400); Tf = log(-F) / 0.73; Tm = log(-M) / 1.2; It is hard to guess, what this means: "I should...

1 jour ago | 1

Answered
I can´t save
Some virus scanners limit the write access to the user's Documents folder to block encryption trojans. Check the logs of the vir...

1 jour ago | 0

Answered
Replace pixels in a matrix without using histeq
for i = 1:1:r %go through rows for j = 1:1:c %columns img_heq(i, j) = T(img(i,j) + 1); end end

1 jour ago | 2

| accepted

Answered
Error using mex: undefined reference for user build package
According to the documentation https://www.mathworks.com/help/matlab/matlab_external/calling-lapack-and-blas-functions-from-mex-...

1 jour ago | 0

| accepted

Answered
TITLE: How to dynamically determine the name of the variable to be called in the function
I do not get the point. "excel file with data-series in EXACT order of countries (Y_aa Y_bb, Y_cc., i.e.: aa bb cc.." Whe...

1 jour ago | 0

Answered
Removing data from a structure that is less than a certain threshold
The iterative growing and shrinking of arrays is extremely expensive. Better: nTraj = numel(AllTraj.Passive); remove = false(...

2 jours ago | 1

| accepted

Answered
Accessing data within a structure
The chosen data structure demands for loops. There is no "efficient" solution, which extracts the fields in a vectorized way. Yo...

2 jours ago | 0

| accepted

Answered
Acessing imrect with another callback
It is a bad idea to set the AppData of the root object. This has the sme disadvantages as global variables. The complete communi...

2 jours ago | 0

Answered
why my plot not being displayed?
Try plot(x, y, 'o') to check, if x and/or y are scalars, which plot infinitesimal small dots only.

2 jours ago | 0

Answered
Angle between 2 3D straight lines
A = [3,7,9]; B = [4,5,8]; C = [4,5,0]; S1 = B - A; S2 = C - A; Theta = atan2(norm(cross(S1, S2)), dot(S1, S2)); W. Kah...

2 jours ago | 1

| accepted

Answered
How to store a variable in a vector?
iVec = 0.001:0.001:0.999999; result = zeros(1, numel(iVec)); for k = 1:numel(iVec) i = iVec(k); ... your code r...

3 jours ago | 0

| accepted

Answered
How to optimize the computing process of a matrix ?
Pre-allocate the output of loops. Example: num = zeros; for nn=1:length(Y) NUM = size(Y{1,nn}); num(nn...

3 jours ago | 2

Answered
Trying to run a script many times and combine all the results
eList = cell(1, 100); for k = 1:100 callYourScript; eList{k} = e; end A cell array is useful, if the elements, here...

3 jours ago | 0

| accepted

Answered
monte carlo simulation in matlab two dices roll
n = 10; % Number or trials throw = randi(6, n, 2); % Value of throws, 2 dice SumThrow = sum(throw, 2...

3 jours ago | 0

| accepted

Answered
Euclidean distance of two vectors
Do you know the definition of the Euclidean distance? G = rand(1, 72); G2 = rand(1, 72); D = sqrt(sum((G - G2) .^ 2)); A m...

3 jours ago | 31

| accepted

Answered
Matlab 2015a unable to find C++ compiler in windows10 even after installing microsoft professional C++ 2012. Can anyone help? I initially tried installing SDK7.1 but i was gettting .net framework4 installation errors.
https://www.mathworks.com/matlabcentral/answers/233850-how-can-i-install-sdk-7-1-on-windows-10 https://www.mathworks.com/matlab...

7 jours ago | 0

Answered
Hi guys. I need help splitting a number into its individual parts and then add them. E.g. the number would be 1994 = 1 + 9 + 9 + 4 = 23
N = 1994; m = floor(log10(N)); D = mod(floor(N ./ 10 .^ (m:-1:0)), 10); >> D = [1, 9, 9, 4]

7 jours ago | 0

Answered
P files cannot be analyzed to find their dependencies. Please add P file dependencies manually
I'd start with a web search: Ask your favorite search engine for "Matlab get dependencies of P file". You will find e.g.: https...

7 jours ago | 2

| accepted

Answered
Stepping Through Text Documents
See https://www.mathworks.com/matlabcentral/answers/57446-faq-how-can-i-process-a-sequence-of-files A more specific answer is p...

9 jours ago | 0

Answered
Output argument "px" (and maybe others) not assigned during call to "function1"
If the initial value of varx is smaller than tol already, the body of the while varx>=tol loop is not entered at all. Then e.g. ...

9 jours ago | 0

| accepted

Answered
where is the the porblem in audiowrite?
In the original question you write: AUDIOWRITE('test.wav',s,srate) In the comment you mention: audiowrite('test.wav',s,t) Th...

9 jours ago | 0

Answered
How can I open a file in a compiled application?
The error message is clear in this point: You cannot use open in compiled applications. This is not a limitation by the trial ve...

9 jours ago | 0

Answered
Permission to write into text file
Do not use 'mojo.txt' as file name without a path. Remember, that any GUI or timer callback could call cd to change the current ...

9 jours ago | 0

| accepted

Answered
I am having this error. Could you help?
The error message is clear: You provide a name, which is not an existing file. What is exactly hidden in the omitted rest of: T...

9 jours ago | 0

Answered
How to append cell arrays with a very specific form
Or: C = {... 'Rating1' [] [] [] '8'; ... 'Rating1' [] [] '3' []; ... 'Rating1' '2' [] [] []; ... 'Rating1' [] '4' [...

9 jours ago | 0

Answered
Error using mex 'No supported compiler was found' on Mac.
Posting the error message offers new insights. Did you try this already - in a command shell of the operating system: sudo xcod...

9 jours ago | 0

Load more