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Simon Chan


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Active since 2021

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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...

21 dagen ago | 0

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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...

23 dagen 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"...

24 dagen ago | 0

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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...

ongeveer een maand ago | 0

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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)

ongeveer een maand 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...

ongeveer een maand ago | 0

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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...

ongeveer een maand 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...

ongeveer een maand ago | 1

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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.

ongeveer een maand ago | 1

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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...

ongeveer een maand ago | 0

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>

ongeveer een maand ago | 0

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

ongeveer een maand 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...

ongeveer 2 maanden ago | 0

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

ongeveer 2 maanden 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...

ongeveer 2 maanden ago | 0

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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))]; % ...

ongeveer 2 maanden 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 = ...

ongeveer 2 maanden ago | 1

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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...

ongeveer 2 maanden ago | 0

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

ongeveer 2 maanden ago | 0

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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 ...

ongeveer 2 maanden ago | 1

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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)));

ongeveer 2 maanden ago | 0

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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), ...

ongeveer 2 maanden ago | 0

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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)

ongeveer 2 maanden 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...

ongeveer 2 maanden 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...

ongeveer 2 maanden ago | 0

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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...

ongeveer 2 maanden ago | 0

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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 & ~(...

ongeveer 2 maanden 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'); ...

ongeveer 2 maanden 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...

ongeveer 2 maanden ago | 0

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