Community Profile

photo

Simon Chan


Hospital Authority

Active since 2021

Contact

Statistics

  • Pro
  • 6 Month Streak
  • Knowledgeable Level 5
  • First Answer

View badges

Content Feed

View by

Answered
How can I convert 3d MRI data (128x128x27) into 4d (128x128x1x27) for visualization using montage?
B = permute(A,[1 2 4 3])

1 month ago | 0

Answered
How to add text to a line in the plot?
If they are horizontal lines, you can use function <https://www.mathworks.com/help/matlab/ref/yline.html yline> By using this...

1 month ago | 0

| accepted

Answered
How to get the MathWorks documentation in chinese?
Select the Chinese website with Simplified Chinese at the bottom of the website. Then you can find the translated documentation...

1 month ago | 0

Answered
Error when selecting variables from an Excel sheet
Better to define the Variable Names already in the spreadsheet as follows: opts = spreadsheetImportOptions("VariableNamesRange"...

1 month ago | 0

| accepted

Answered
how to save plot with its background color without the gray color
b_col = [255, 150, 0]; % orange color code b_col = b_col./255; f = figure; f.Color = [1 1 1]; % Set the...

1 month ago | 0

| accepted

Answered
Argument of max values of multiple 2D arrays
A1 = [1000 25;3 258]; A2 = [1 30;247 259]; C = 10*(A1>A2) + 20*(A2>A1)

1 month ago | 0

Answered
How to change axes in tiledlayout with different x and y axes
In order to set the limits, use the following ax1.XLim = [XAxislow XAxishigh]; ax1.YLim = [0 400]; instead of ax1.XLimit...

2 months ago | 0

| accepted

Answered
How adding second grid and values in stackedplot
Set the YLim and YTick for that particular axis. X = 0:4:20; Y = randi(5,6,3); f = figure; s = stackedplot(f,X,Y); s.GridVi...

2 months ago | 0

Answered
Scatter matrix of probability of occurrence
You may use function hiscounts2 rawdata = readmatrix('https://www.mathworks.com/matlabcentral/answers/uploaded_files/963270/Wav...

2 months ago | 1

| accepted

Answered
How to define a colormap easily
Use Colormap Editor by typing 'colormapeditor' in the Command Window. You may also define your own colormap easilty.

2 months ago | 1

| accepted

Answered
Struggling with hold on and hold off placements
How about this? L = 2 ; g = 9.81 ; Theta_0 = pi/3 ; % Equations for pendulum p = 2*pi*sqrt(L/g); t = 0:(1/30):2.837 ; The...

2 months ago | 0

| accepted

Answered
Change Datetime 'yyyy.MM.dd HH:mm:SSS' to 'HH:mm:SSS'
use function <https://www.mathworks.com/help/matlab/ref/datetime.timeofday.html timeofday>

2 months ago | 0

| accepted

Answered
How to remove country boundaries from map?
Just use the default one geoscatter([10 55], [80 140], 18, 'filled', 'r')

2 months ago | 0

Answered
How to loop over table to caluclate averages?
Check the following: B: quarterly ratios C:annual ratios D:overall average ratio for an arbitrary period rawdata = readtable...

2 months ago | 0

| accepted

Answered
How to display text in the same line after processing?
Somthing like this? fprintf('Processing xyz file .....'); a = rand(10000,10000); fprintf('done')

2 months ago | 1

Answered
How to do simultaneous flickering of two straight line plots
Use function timer to set one timer for plot a and the other for plot b. Attahced please find the function and you can run it t...

2 months ago | 0

| accepted

Answered
Can I add unknown number of check boxes in live editor?
Suppose your data is a cell array, update your uitable by the following: uit.Data = [data,num2cell(false(size(data,1),1))]; % ...

2 months ago | 0

Answered
Putting NULLs in between the string array.
Hope I understand it correctly, try this: A={'a','b','c','d','e'}; index=[1,3,5]; newindex = index+(0:length(index)-1); N = ...

2 months ago | 1

| accepted

Answered
Why am i getting 'Array indices must be positive integers or logical values" when trying to plot this function?
Remove the x1, otherwise it becomes the index of the varaibles f1,f2 & f3 where index must be a positive integers. That's why yo...

2 months ago | 0

| accepted

Answered
Calculating mean values of a 3D matrix for every rows
Try this: mean(yourmatrix,[2 3]);

2 months ago | 0

| accepted

Answered
Calculate mean value between 2 years
Not sure what is the format of your data. Use function isbetween and below shows an example that you can implement it into your ...

2 months ago | 1

| accepted

Answered
How to insert a column of zero into a 3D matrix?
Try this C=cat(2,A,repmat(B,1,1,size(A,3)));

2 months ago | 0

| accepted

Answered
Why do I keep getting this error with my for loop?
Remove the for loops, just use y_e1=coeffs(1)*exp(coeffs(2)*-ky_e1); y_e2= coeffs(1)*exp(coeffs(2)*ky_e2); y_e = [y_e1(:,1), ...

2 months ago | 0

| accepted

Answered
How do you vertically concatenate the rows of a cell array consisting of vectors of numbers?
Tru the following: cellfun(@(x) cell2mat(x),num2cell(a,1),'uni',0)

2 months ago | 0

Answered
Why doesn't my figure(2) display anything?
Variable x has 8 numbers while variable a has 9 numbers. However, Variable y and b are calculated based on the value of variabl...

2 months ago | 1

Answered
streak in a character array
Sorry that I overlooked the question in my previous answer, here is the updated one: cArr = 'aaaaBBc'; pos = find(diff([0,diff...

2 months ago | 0

| accepted

Answered
How can DropDown Items dynamically obtain the name of different sheets in Excel instead of manually entering items?
When you import the file, get the sheet names and put them as the 'Items' of the uidropdown. sheetName = sheetnames(fullfile(pa...

2 months ago | 0

| accepted

Answered
how to select an interval of certain hours each day within a larger timetable using timerange
Do you accept not using function timerange as follows? T = readtable('date.txt') T.Var1(hour(T.Var1)<9 | hour(T.Var1)>=17 & ~(...

2 months ago | 0

Answered
plot graph based on given values
May be this: sheets = sheetnames('https://www.mathworks.com/matlabcentral/answers/uploaded_files/941694/my_excel_file.xlsx'); ...

2 months ago | 1

Answered
How to get mean / averaged values among of duplicated data array?
Use function groupsummary opts = detectImportOptions('demo.txt'); opts.VariableNames = {'Time','Data'}; T = readtable('demo.t...

2 months ago | 0

| accepted

Load more