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jonas


Last seen: Today
503 total contributions since 2018

Please do not send private requests per e-mail, as I wish for my contributions to reach a broader audience. If you specifically want help from me, feel free to grab my attention by sending an email with a link to your question.

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Answered
How to enable the colorbar to only show the vertical scale with values ?
Not sure if this answers your question, but it's an alternative to using a colorbar for scale. Also did not use the "outside" ar...

1 hour ago | 0

Answered
Is it possible to identify data in a for loop?
I would probably collect the data in the loop instead and then call plot outside of the loop. Could use something like this: d=...

12 days ago | 0

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Answered
Display data ONLY inside closed polygons
Super simple if you have X,Y,Z with Z being elevation as well as a closed polygon defined by xp and yp %some sample data [X,Y]...

12 days ago | 0

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Answered
Merge .txt files with specific suffix
Could do something like this if you have a small number of "groups". For a large number of groups, I would suggest just extracti...

13 days ago | 0

Answered
RGB Image re-interlacing missing output colors.
I'm guessing your input image is uint8 (0 = black, 255 = saturated) and that your output image is class double (0 = black, 1 = ...

15 days ago | 0

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Answered
How to check if my time series has a repeated hour in a matrix of 10200 rows?
Convert everything to datetime and then check the difference %some data, note that 2000-1-1 10:00:00 is repeated t = datetime(...

16 days ago | 0

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Answered
Saving gray scale image
Using a single color channel to convert your image to grayscale is not optimal. The gray tone is usually a combination of red, b...

16 days ago | 1

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Answered
How can I georeference this grid/matrix?
With the mapping toolbox you can just replace your plot functions with the corresponding map axes function. load coastlines a...

18 days ago | 0

Answered
how to load an ASCII file
Based on the sample given in the comments A = readmatrix('Trial 1.txt') or better yet, opts = detectImportOptions('Trial 1.tx...

19 days ago | 0

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Answered
replacing Nan with 0
The line does not work because the left part just returns a logical. isnan(auPoints(r,c)) = 0 It is similar to writing isnan...

19 days ago | 0

Answered
Axes labeling and over-plotting two graph having different data size
Problem is that you're using the outdated date format. Most of your issues will probably go away if you change to datetime forma...

24 days ago | 1

Answered
How to shift data in a 3D plot?
You just need to pass x and y data to surf. surf(1:256, 0:255, Z)

25 days ago | 0

Answered
How to plot 2d & 3d contour with xy coordinates with corresponding z values?
If you had the geometry saved, e.g. as .stl file, then you could just pass some constraints to the delunayTriangulation. However...

25 days ago | 0

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Answered
4 x 4 Mask to Identify Regions on Map with Highest Value
Using imresize from the image processing TB %non-overlapping (use conv2 method 'valid' for overlapping) A = imresize(Z,0.5,'b...

25 days ago | 1

Answered
Plotting multiple axes that are adjacent to each other
Use this FEX function https://se.mathworks.com/matlabcentral/fileexchange/27991-tight_subplot-nh-nw-gap-marg_h-marg_w

25 days ago | 1

Answered
How can I shade the background of a timeseries plot based on another value.
You could do something like this, %some data days = 100:199; PA = repmat([0 0 0 0 1 1 1 1 1 1],1,10); %PA = 1 -> blue ba...

27 days ago | 0

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Answered
Extracting Numbers from a mixed string
out=regexp(b,'\d*\.?\d+','match') Your expression will fail when there are more than 1 digits before the decimal sign, as ? is ...

28 days ago | 0

Answered
Removing the first row in data with multiple headers
As per isakson said, use detectimportoptions to fine-tune your table import. fname = 's03_lab_base.c3d.txt'; opts = detectImp...

28 days ago | 0

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Answered
How can I create a variable number of arrays and plot in the same image?
Something like this? data = readmatrix('example.txt') x = data(:,1); v = data(:,2); id = find(x == 0); im = reshape(v,id(2)...

28 days ago | 2

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Answered
Remove leading zeros from dates strings
You can use histogram() to count occurences, either with datetime or categoricals as input. dates = datetime(2010,1,12) + rand...

28 days ago | 0

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Answered
Cannot get mod to return correct value
You could try this FEX TB by John D'Errico. https://se.mathworks.com/matlabcentral/fileexchange/22725-variable-precision-intege...

28 days ago | 0

Answered
Changing the value of a spinner from another spinner
I'll just put it here for future reference :) Like most other objects, the slider is adjusted by changing the value field ...

30 days ago | 1

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Answered
How to plot 3d from scattered dataset captured from xlsx file?
You need gridded data to use surf. You have scattered data. xyz = readmatrix('sample.xlsx'); [x,y,z] = deal(xyz(:,1),xyz(:,2)...

1 month ago | 1

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Answered
Animating a complicated 3d graph
I just made some changes to your code to show you a different way of getting a similar result. Basically, just update the ydata ...

1 month ago | 0

Answered
Drawing line segments in a 3d plot
Something like this? A = rand(6,5); startv = [A(:,1),A(:,2),A(:,5)]; endv = [A(:,3),A(:,4),A(:,5)]; figure;hold on scatter3...

1 month ago | 1

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Answered
How to use the same .mat files in different activities AppDesigner
You could put the content of the .mat file in a public property. Go to code view > select properties > add a public property. ...

1 month ago | 0

Answered
Time plotting in MATLAB
You can delete the secondary label (undocumented property), delete(ax.XAxis.SecondaryLabel) ...but I would just plot the data ...

1 month ago | 0

Answered
Daily average of several years data
This will probably work [~,~,G] = unique([SST(:,1),SST(:,2)],'rows') out = splitapply(@mean,SST(:,4),G); You should end up wi...

1 month ago | 0

Answered
how to create diagonal stripes in a specific area of plot
Try this FEX function https://se.mathworks.com/matlabcentral/fileexchange/30733-hatchfill This could also work for i = -size(...

1 month ago | 0

Answered
Finding time difference that meet criteria
First make sure your data is in duration format. %making up some data t1 = (hours(10):hours(2):hours(24))'; t2 = t1 + rand(nu...

1 month ago | 0

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