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Rik


Last seen: Today Active since 2017

E-mails with feedback/questions about FEX submissions are welcomed. In general I will post e-mails about Answers on the related page, unless there is good cause not to do so.

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Answered
why is my code not working for a particular set of input?
Your code doesn't support array inputs. The easy way to deal with this is what I outline below. Note that this is not the optim...

5 hours ago | 0

| accepted

Answered
How to compare strings to other strings in the same array which contains regular digits
If the digits are the same, then the strings will be the same as well. So why not use strcmp? strcmp('F1_G2_C3','F1_G2_C3') Or...

7 hours ago | 0

Answered
Is it possibile to use a p-file in Matlab Mobile?
As far as I'm aware, Matlab mobile is only a portal into Matlab online. So if you can use that p-file there your should be able ...

7 hours ago | 0

Answered
logical operation with categorical data
This depends a bit on your source data, but you should look at the ismember function. Especially when combined with any, it real...

7 hours ago | 0

| accepted

Answered
why is my difference image black?...
Originally accepted answer by @AZARIA KATHY MOHAMMED: https://www.mathworks.com/matlabcentral/answers/1467816-why-is-my-differe...

8 hours ago | 0

Answered
how to take average of each column of matrices
It sounds like you want something like this: A = randi(9,[6 3 6]); U = 3:5; % do it with a loop M = zeros(size(A,1),size(A,2...

1 day ago | 0

Answered
How to load and import a .mat file?
As the documentation explains, using load with output arguments will return a struct. help load So what you need to do is load...

2 days ago | 0

Answered
GUI - Error when trying to program the second slide bar for the upper limit for variable hue in image processing (lower limit succeeded)
Your syntax doesn't match up. In your callback definition you have only 3 inputs, but your function assumes 4. I would suggest s...

2 days ago | 0

| accepted

Answered
Passing multiple function handles to fminimax
You will have to create a wrapper that calls the functions in your cell array and returns the result as a vector. Something l...

4 days ago | 1

Answered
Plot with dot notation as an updating variable
You painted yourself in a corner when you decided to store data in variable names. However, you can still use your mat files. Yo...

6 days ago | 0

| accepted

Answered
matlab coding how to do this?
doc input doc if

7 days ago | 0

Answered
Problem in calculating 30th percentile
Write a function that calculates the 30th percentile for a vector. Then provide the handle to that function to splitapply. Th...

10 days ago | 0

| accepted

Answered
On the app designer, how can i log data in real time to a .mat/.txt file
This sounds like you could solve it by using one of the append flags when using fopen. Then you can fprintf what you need to wri...

12 days ago | 0

Answered
Loading multiple data folders and call them in a For Loop
Your mistake was in your naming of the variables. If you can guarantee they are always integers, you can do something like this ...

12 days ago | 0

Answered
find, change and plot a txt file
Break it up into tasks you either know how to do, or for which you can google a solution. So first: how can you read a text fil...

12 days ago | 0

Answered
How can I change the upper case letters in a string to lowercase while also changing the lowercase letters to uppercase?
No need for a loop. There are three 'types' of characters that are potentially in your string: Upper case characters Lower ca...

12 days ago | 0

Answered
How to change format time to GPS week, GPS seconds?
The start date of this GPS epoch is probably on Wikipedia. You can simply subtract that date from your date. Then you calculate...

12 days ago | 0

| accepted

Answered
Bunch of Errors with Matlab GUI
GUIDE is infamous form auto-generating a lot of bloat. Let's first remove all that (and the init function, since that is the sam...

13 days ago | 0

Answered
Marker edges, line width and legend
Or you use a line object without any points to get the legend entry you want: xx=linspace(0,12); plot(xx,sin(xx),'LineStyle','...

14 days ago | 0

| accepted

Answered
Can I use a variable name to make logical comparison?
You could use the string datatype (as Chunru suggested), or use a cellstr (a cell array of char vectors): %month = input('Enter...

16 days ago | 1

Answered
(Need Help) Is fmincon command available for the embedded coder?
There is a section at the bottom of the documentation page of fmincon that lists limitations for code generation. This section ...

16 days ago | 0

| accepted

Answered
Load and display bitmap file using Fread
You should reshape the data, not the fid. To remove the first 54 bytes you can use fseek, or just skip it from your array: ...

18 days ago | 0

Answered
How to get rid of green marker/arrow?
This looks like the pointer that indicates where your code execution has paused so you can step through the code. If so, you sho...

18 days ago | 1

| accepted

Answered
How to plot audiofiles in Vertically
There is no VerticalAlignment property for uicontrol objects (neither in R2018a or R2021b). A center alignment is the default. F...

22 days ago | 0

Answered
reading the data with title
Any Google search for 'read text file matlab' should provide you with an answer that works. What I personally use is my readfile...

22 days ago | 0

Answered
New to matlab. Why i get this answer?
syms y(t) yef(t); ymax=120*0.40680; yef(t)= 0.95*(1/(1+(y(t)/ymax)*y(t)+(1-(1/(1+(y(t)/ymax))*ymax)))); yo=0.40680*140; k10=...

23 days ago | 0

| accepted

Answered
Deleting certain elements from an array without looping
The code Chunru wrote will work, but I have a few suggestions. Instead of using length, you should consider using numel as a ha...

23 days ago | 1

| accepted

Answered
overlay bar plot without mixing color
Here is my solution, which allows you to specify the 3 face colors separately: A = [1;5;3;7;4]; B = [3;2;4;8;2]; shared=min(A...

23 days ago | 1

| accepted

Answered
How do you create an array of date times given a starting date and number of days?
Vector1=1:5; Datetimevector = datetime(1900,1,1)+days(1:numel(Vector1))

26 days ago | 0

| accepted

Answered
How to view a mat file that says preview too large to display Properly in Import Wizard
A mat file is a file, not a variable. It may contain variables. Judging from your description it only contains a single variable...

27 days ago | 0

| accepted

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