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Discussion
Where have all the questions gone?
I've left Matlab Answers in spring 2023. At this time the forum was full of interesting programming questions, e.g about optimiz...
23 jours il y a | 0
every restart of Matlab path is lost
To localize the folder of pathdef.m see: which pathdef -all Usually pathdef is found in <matlabroot>\toolbox\local\ . But if a...
2 mois il y a | 0
error from Interpolation of the attached data
This seems to be a job for https://www.mathworks.com/matlabcentral/fileexchange/16098-uniquify . Then: load('data.mat'); figu...
3 mois il y a | 0
FIND THE INVERSE MATRIX OF A
Only 1 c) has a relation to Matlab. You can solve this by: inv([1, -1, 5; 3, 9, 7; -2, 1, 0]) The verification in 2 b) is pe...
3 mois il y a | 0
Count number of true statements in a sequence until false, then check for the next true and repeat
If this is time-critical, see: https://www.mathworks.com/matlabcentral/fileexchange/41813-runlength x = logical([0,0,0,0,0,0,1,...
3 mois il y a | 0
check if a file exists
Starting in R2017b, you can use the "isfile" function to check if a file exists. For example: if isfile(filename) % File ex...
3 mois il y a | 64
| A accepté
Why does backslash behave differently when transposition is used in-line?
The already given answers explain the effect alreayd. A summary: Why does backslash behave differently when transposition is us...
4 mois il y a | 1
Question
How to find a function in the path - securely?
What is a safe method to check, where a specific function exists in Matlab's path? It should not matter, if the function is an M...
4 mois il y a | 2 réponses | 1
2
réponsesQuestion
Effects of adding folders in -FROZEN mode
When folders are added by addpath('-frozen'), the time stamps of the M-files are not checked. This should improve the speed, esp...
4 mois il y a | 1 réponse | 1
0
réponse
Pleae i can solve this error broblem
Inside the code line 48 you find this part: a*s*h(a4+a1)*dt*dE % ^ here There is a missing operator after the variable h. ...
6 mois il y a | 1
Loss of precision in wave equations
The sum is numerically instable. So your observation is expected. Beside the symbolic toolbox oder a toolbox for arbitrary pres...
6 mois il y a | 0
Why does pcolor not display the full matrix?
c = [1, 2, 3; 4, 5, 6; 7, 8, 9]; x = [1, 2, 4]; y = [1, 3, 4]; H = pcolor(x, y, c); Fine. PCOLOR does exactly, what it is wa...
6 mois il y a | 0
I want to smooth curve matlab
Exporting a diagram as EPS or PDF creates a vector image, which is sharp even if you magnify it. You might want to use a famous...
6 mois il y a | 0
Cell conversion to double
To convert a cell array of character vectors to numbers, you can use the |str2double| function. This function is the simplest me...
presque 2 ans il y a | 36
| A accepté
Question
How to write ASCII to byte file?
In MATLB versions until R2021a I could write ASCII values stored in a CHAR array into a string as unsigned char by: data = char...
presque 2 ans il y a | 3 réponses | 2
3
réponsesA soumis
WinPower
Shutdown, sleep, hibernate etc. of Windows computers
presque 3 ans il y a | 903 téléchargements |
Trying to ammend pathdef.m using the Set Path button on the Home bar.
If you want to modify the pathdef.m file for all users of the computer, start Matlab with admin or root privileges. Then overwri...
presque 3 ans il y a | 0
need a script to rename and resort TIF files
Folder = 'C:\Users\Desktop\New folder\'; Files = dir(fullfile(Folder, '*.tif')); Keys = {'A', 'B'}; [~, name] = filepart...
presque 3 ans il y a | 0
| A accepté
How to inclusively extract rows of a large cell array between cells given start and end patterns?
Why do you want to avoid loops? Reading the file completely to apply vectorized methods requires 8 GB of contiguous free RAM for...
presque 3 ans il y a | 1
Find index of cells containing my string
Do you want to search for 'bla' within the text in each element of the cell array, or for elements that are 'bla' exactly? If yo...
presque 3 ans il y a | 119
| A accepté
Can I generalize a folder lookup location so that data can be accessed in more than one way?
The core of the problem is a messed up storage of files in a bunch of folders. Collecting the files in one shared folder would b...
environ 3 ans il y a | 0
How do I close parallel button?
You can try: FEX: CmdWinTool CmdWinTool lean
environ 3 ans il y a | 2
How can I select two out of 6 points for every page without loops?
n = 2; X = randi(40, 6, 3, n) mask = all(X >= 0 & X <= 30, 2) Y = reshape(X(cat(2, mask, mask, mask)), [], 3)
environ 3 ans il y a | 0
| A accepté
using feval or not?
I do not see problems with using feval. There have been a speed penalty in old versions, as far as I remember R2009a. But now t...
environ 3 ans il y a | 0
| A accepté
save matrix command works sometimes and sometimes gives error
Avoid strcat to create a folder name, but use fullfile, which cares for the correct separators. A try/catch block is the way to...
environ 3 ans il y a | 0
Integration time step in ODE45 Matlab
The output time interval is the integration interval, so you can grab it e.g. in the outputfcn.
environ 3 ans il y a | 0
Warning: Single line Edit Controls can not have multi-line text
res is a numerical array. You cannot insert it as string in handles.edit5. Display an image in an axes as image object.
environ 3 ans il y a | 0
Why Euler's number e = 2.71828... is not a built-in constant in MATLAB?
What an epic discussion. Some levels less sophisticated: I needed exp(1) in a line of code called very frequently. exp() is an ...
environ 3 ans il y a | 0
How to produce 1 and -1 in MATLAB
Exactly 50% or randomly? x = randi([0, 1], 1, 2000) * 2 - 1; y = [ones(1, 1000), -ones(1, 1000)]; y = y(randperm(y));
environ 3 ans il y a | 1
