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Rik


1,481 total contributions 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
How to code fprintf on multiple lines ?
As far as I'm aware this should work with strings as well, but I frequently use a setup like this with a char array instead. So ...

3 hours ago | 1

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Answered
Insert PNG image into normal image
If you want to prevent overwriting the underlying image for some pixels, you can use a logical mask to only overwrite some pixel...

10 hours ago | 0

Answered
Write data to text file
This is probably due to Matlab being column-based, instead of row-based. This may result in counterintuitive results if you ente...

1 day ago | 1

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Answered
Cell to matrix average
Something like this should work for you: %generate some example data data=cell(93,1); for n=1:93 data{n}=rand(45,147,19)...

1 day ago | 0

Answered
How do you use ls to change your directory in Matlab?
The homework is either badly designed, or is attempting to teach you why you shouldn't use it. You shouldn't change your curren...

1 day ago | 0

Answered
Standard Deviation of 3D matrix with NaN elements
This syntax should work for most releases: sdev=std(m(:),'omitnan');

1 day ago | 0

Answered
Picking files according to file names
Use the dir function to generate a list of files, then parse the file names in a loop and continue to read the relevant files.

2 days ago | 0

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Answered
Finding consecutive data with non zero in array
I used the mfile version of Jan's FEX submission RunLength, because I can't get my compiler to work right now. With the runlegth...

2 days ago | 0

Answered
randomly divide vector into 2 parts.
I don't fully understand every step of your code, so I rewrote it: index_rating=rand(100000,5);%generate example data training...

3 days ago | 0

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Answered
imread not working for gif problem
It took some digging with the debugger, but with enough breakpoints I was able to track down the cause. Your calls are failing b...

3 days ago | 2

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Answered
write a range on the y-axis
You can modify the XTickLabels property to display any char array. figure(1),clf(1)%only use clf during debugging ax=axes; pl...

3 days ago | 0

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Answered
How can I run a Matlab script at the same time everyday?
It is probably easiest to use the options your OS provides and run a headless instance of Matlab. On Windows you can use the tas...

6 days ago | 0

Answered
Changing data from long form to short form
You can use the participant ID and trial ID as the indices and either use accumarray or sub2ind to fill the matrix with the valu...

7 days ago | 1

Answered
How to count the number of voxels of another color
Similar to how you would do that for 2D: IM=randi(255,[512 512 400]); count=sum(IM==200,'all'); %if your release doesn't ha...

7 days ago | 0

Answered
Save data from MatLab GUI to struct .mat file
You should always load to a struct. That makes it clear where variables come from. Then it is also easier to extend the struct i...

7 days ago | 1

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Answered
How can I base my legend on the markers I defined in my plot?
The best solution is to set the DisplayName property when calling plot, and/or use an array of handles to create the legend. See...

7 days ago | 0

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Answered
Legend repeating same color
Set the DisplayName property when calling plot, or use the output from plot to build your legend with specific handles. x=linsp...

7 days ago | 0

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Answered
write and read the same image but they are different
You should read the documentation of the functions you're using if you want to understand them. Matlab has excellent documentati...

7 days ago | 0

Answered
Make matlab use a function from a certain toolbox
You have assigned something to a variable named dist. That will shadow all functions. The solution is not to use dist as a varia...

8 days ago | 0

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Answered
Comparing 2 lists and assign a value
If you can make two arrays, you can use the ismember function, which should work well for large arrays as well.

9 days ago | 0

Answered
How do I end a program when a condition is met using only if-else-elseif statements?
Something like this will work (edit to add nesting): function out=MyFunction(in) if in<1 if in==0.5 %do somethin...

9 days ago | 0

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Answered
Why won't MatLab properly download onto my windows laptop?
If you go to your account (this link should get you there) you can click on your license number. Then go the 'Install and Activa...

10 days ago | 0

Answered
Custom GUI: Check for updates
You could probably have a function check your website at most once a week by calling your update function when starting some spe...

11 days ago | 1

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Answered
HOW Calculate the distance of points form one center in 2-D space and display output in a distance matrix?
This should do the trick: X=2*(rand(5,5)-0.5); Y=2*(rand(5,5)-0.5); x=0.3;y=0.3; d=point2pointcloud(X,Y,x,y) function d=p...

11 days ago | 1

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Answered
how can i covert following variables as Indexed variables ?
No need for a conversion, they already are indexed variables. Lets give a small example of what this message means: data=1:5; ...

12 days ago | 1

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Answered
How can i fit the data to the custom equation without using Curve fitting Toolbox ?
Sligthly exanpding on what Walter suggests: fun=@(ABCDE,t) ABCDE(1) + ABCDE(2) .* (1-exp(-t./ABCDE(3))) + ABCDE(4) .* (1-exp(-t...

12 days ago | 0

Answered
Where should we install third-party toolboxes under Windows?
My personal preference would be to pick 2 or 4. In general users messing with their copy of Matlab causes headaches. The advanta...

13 days ago | 0

Answered
why am I getting 'ugly' output?
At this point you should consider creating a small GUI for your input selection. But for your question at hand: you forgot to al...

13 days ago | 1

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Answered
How to show r square correlation and RMSE on a scatterplot
With the code below you can determine a fitted value for y. Now it should be easy to calculate the Rsquare and RMSE. Let me know...

13 days ago | 1

Answered
Array inside an Array
If you have only positive integers, you can use an undocumented feature of strfind: D=[0 1 1 2 3 4];d=[1 2 3]; strfind(D,d) % ...

14 days ago | 0

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