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Simon Chan


Hospital Authority

Active since 2021

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Answered
Convert dcm file to text file
You may use function dicomread to read the DICOM image. Then you can use function writematrix to write each frame into a text ...

2 months ago | 0

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Answered
Exporting Matlab App Graphs
Use function getframe is an alternative option. It captures the screen according to the uitable position and put on a tradition...

4 months ago | 0

Answered
change size of rectangles in full screen
Check this: https://www.mathworks.com/help/matlab/creating_guis/managing-resizable-apps-in-app-designer.html One way is to set...

4 months ago | 0

Answered
Filter Recommendation for Smoothing a Specific Signal
One possible way is to use function smoothdata. Since the data on variable x has duplicated data and the step size is not equal...

4 months ago | 0

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Answered
Change ylim of spectogram
It should divide by 1000. fs = 20000; n = 0:5*fs - 1; N = length(n); t = n/fs; fT = 1000; fM = 3; ...

4 months ago | 0

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Answered
Same aspect ratio for the z-axis in a surface plot
As mentioned by Mathieu NOE in the comment section, your z-axis data is 1000 times smaller than the range of x and y-axes data. ...

4 months ago | 0

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Answered
TAB GROUP in app designal : how to display keys vertically
Select TabLocation to left or right

4 months ago | 1

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Answered
Matching datenum from multiple arrays
If your final goal is to extract the information from these 2 files with the same date and time, use function innerjoin. For th...

4 months ago | 0

Answered
resize Excel data matrix
Try this to see whether it is what you want. rawdata = readmatrix('https://www.mathworks.com/matlabcentral/answers/uploaded_fil...

4 months ago | 0

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Answered
How to thicken a line separately for the parallelplot of matlab?
Separate the data into two groups as follows: Age = randi(50,[100,1]); % Random data Height = randi(180,[10...

4 months ago | 1

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Answered
How can I get DataCursor information from scatter plot using a callback function in app designer
The coordinates is stored in the property called IntersectionPoint belongs to the events in the ButtonDownFcn callback as shown ...

4 months ago | 0

Answered
Transparent patches in the main figure, but no transparent patches in the legend
One possible way is to use dummy handles. N = 100; x = linspace(0,1,N); y1 = repmat([-2;2],1,N); y2 = repmat([-1;1],1,N); f...

4 months ago | 1

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Answered
how to convert .mat file to .dcm file?
Try the following: rawdata = load('petnew.mat'); J = permute(rawdata.petnew, [1 2 4 3]); dicomwrite(J,'yourFile.dcm');

4 months ago | 0

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Answered
I can't draw the vector field
The spacing used in function gradient is 0.2, but the spacing in your data is 0.3 and hence it give you an error. Try using same...

4 months ago | 0

Answered
y-axis with diffent scalings
Let's try use function yyaxis. Separate the data into two groups and plot the larger and smaller values using left and right y-...

4 months ago | 0

Answered
How to interpolate in 2d with the 3rd variable as a vector?
If you are using R2023a, you may use function fillmissing2. dt = [3.96 4.36 0.6 2.6 1.44 3.84 3.64 0.72]; x = [80 120 40 60 10...

4 months ago | 1

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Answered
creating a warning dialog that wait until the user press ok, if the user press x the execution stops
One possible way is to use function uniconfirm. fig = uifigure; selection = uiconfirm(fig,'Overwrite existing excel file','Fil...

4 months ago | 1

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Answered
Convert Pixel value to HU on MicroCT without the Rescale Slope and Rescale Intercept Attribute
The variable 'slice500' in your code is a matrix only, and hence you can display it as an image by using function imshow() or im...

5 months ago | 1

Answered
How to save volshow(data,config) as fig or img [volumeViewer]?
In case a new window is open after using function volshow, you should be able to find the figure object and save the image using...

5 months ago | 2

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Answered
Viewer3d fullscreen position command not working?
Sorry that I was only guessed last night and recently tested on my laptop. The viewer3d object is act as a Children on a figure...

5 months ago | 0

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Answered
How do I find the circularity of the bubbles in the sample IR image?
Check this: Revised Circularity Measurement in regionprops (R2023a) if you are using R2023a. Or check the answer from Steve Edd...

5 months ago | 0

Answered
Plotting the exact and numerical solutions on the same plot
Just add hold on f = @(t, x) (x-t^2+1); [t, x] = RK4Method(f, 0.5, 0, 2, 200); plot(t, x); xlabel('time'); ylabel('x'); ho...

5 months ago | 0

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Answered
App designer: UIAxis ButtonDownFcn with key modifier?
You may combine several callbacks to achieve your goal. The attached example uses WIndowKeyPressFcn and WindowReleaseFcn from a...

5 months ago | 1

Answered
Resize font size automatically when app window size is enlarged
You may try to use SizeChangedFcn callback to adjust the font size as a workaround. The following example determine the new fon...

5 months ago | 0

Question


ocr not recognizing some numbers
Trying to use function ocr to extract some numbers from the attached image. Expected to have 9 numbers and the results have 8 n...

5 months ago | 3 answers | 0

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answers

Answered
setting limit for colormap
You may try to create a custom colormap using colormapeditor.

5 months ago | 0

Answered
Image Distortion after convert axial CT to sagittal view
The images are not isotropic and hence it is distorted. Use function imresize after you reconstruct the image from axial to sag...

5 months ago | 1

Answered
How to create a plot with customized axis location?
You may move the axis to the origin by setting 'XAxisLocation', or 'YAxisLocation' property to 'origin'. Otherwise, you have to...

6 months ago | 0

Answered
How to reproduce identical tab whenever button is clicked?
Set the Callback of Button pushed function as follows: % Button pushed function: Button function duplicateTab(app, event) ...

6 months ago | 0

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Answered
Measure time until type a certain key
Attached is a small program that you may try to see whether it is suitable for your purpose of not. It will open an empty figur...

6 months ago | 0

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