Community Profile # Simon Chan

### Hospital Authority

Active since 2021

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find and store the index value of maximum or minimum value of cell array
[~,idxMax]=cellfun(@max,yourCell); % Index for maximum [~,idxMin]=cellfun(@min,yourCell); % Index for minimum

23 hours ago | 0

How to create ROI object handle?
You may try the following: h = figure; imshow(imread('pout.tif')); imrect(); % not use the output of imrect() ax=gca; hAx=f...

1 day ago | 0

Having issues with fprintf statement. It gives me "error using vertcat"
Missing dots in the second line, try the following fprintf(['j \t k =1 \t k=2 \t k=3 \t k=4 \n'... '- ----...

2 days ago | 0

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How to align both vertically and horizontally annotation box with legend box in plots?
"annotation" dose not have properties of legend command as north, east,... I think you may need to calculate the margin separat...

3 days ago | 0

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How to skip zeros values form a matrix and plot with a time values?
You may put those zero to NaN and plot it. It will skip those points. A = [1,2,3,4,0,6,7,0,9,10,11,0,13,14,15]; t=[1,2,3,4,5,6...

8 days ago | 1

Plotting a legend without displaying data on UIAxes
Try this if you would like to show the figure and legend without showing the data. Set the 'LineStyle' to 'none' to hide the li...

8 days ago | 0

how do i use datetime adjust xtick
Try the following without using the function datetick. f = figure; ax=gca; plot(ax,all_time_1206 , all_tide_outliner_1206,'k'...

8 days ago | 0

i want to see each plot figure for every j i have, so how can i do it?
Your for loop states j = length(dt1), which is 3 in your case. So the for loop only do figure 3 for you. Use the following inst...

16 days ago | 0

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How to shade the same area in each subplot in a 5x1 Figure?
If you would like to shade the entire region and already knowing the y-limits, you can put the value of those limits directly wh...

16 days ago | 0

detecting circle using hough tranform
The range of radius is too small and the sensitivity may not be good enough. I choose radius from 100 to 150 pixels and sensiti...

16 days ago | 1

Error using convert2quaterly: The value of 'TT1' is invalid.
Your data has only one column besides the date. So you can only state one method to your data. The following shows an example w...

17 days ago | 0

JPG to GIF animation
The colormap for the first two figures are overwritten by the third one in the following: [A,map] = rgb2ind(imread('obr_0.jpg')...

22 days ago | 0

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delete consecutive commas in txt file

22 days ago | 1

Save a Figure as a .png and .pdf of a Specific Size
Try this to see whether the following is what you want. clear; clc; f = figure; plot(1:10,1:10); % Set figure position after...

23 days ago | 0

Import data csv with date/time and other info with setvaropts

24 days ago | 1

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Start and end date picker to load data to graph
If your weather data are arranged in timetable format, another option you may use is function timerange. Suppose the variable n...

1 month ago | 0

Plotting graph with three variables
Try to use function <https://www.mathworks.com/help/matlab/ref/plot3.html plot3> or <https://www.mathworks.com/help/matlab/ref/s...

1 month ago | 0

Min and Max values and corresponding x/y values
use two output arguments from function <https://www.mathworks.com/help/matlab/ref/max.html#mw_f4dadb60-ee1a-4996-a37b-2fdd20904f...

1 month ago | 0

Average column data with specific values
Use function writetable to convert your data on a table array. Then use function groupsummary as follows G = groupsummary(T,"...

1 month ago | 1

Integer operands are required for colon operator when used as index.
When you plot the solution, you use the following index: 1:(nt/10):nt However, variable "nt" is equals to 1001 and the result ...

1 month ago | 0

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How to delete symmetry cells in Matlab?
Try this: F = cell(1,3); F{1} = cell(1,10); F{2} = cell(1,16); F{3} = cell(1,16); F F{2}(9:16)=[]

1 month ago | 1

Vector as ItemsData property in List Box
Suppose the listbox is defined as follows and ItemsData are given in your example. app.ListBox = uilistbox(app.UIFigure); You ...

1 month ago | 0

How to draw rectangle with coordinate, height and width provided?
Another option is to determine the coordinates of the lower left corner of the rectangle before you draw it. It can be determine...

1 month ago | 0

Function in App-Designer struggles to read dropdown values
Use function str2double as follows: % Value changed function: minFrequenzDropDown function minFrequencyDropDownValueC...

1 month ago | 0

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Remove row if its value is not different enough from the value in the row above it.
Let A be your matrix, try the following: threshold = 100; A([false;(diff(A(:,1))<=threshold)],:)=[];

2 months ago | 0

How to plot mutiple vertical lines over x axis ?
User function xline is easier.

3 months ago | 0

how to remove arrows in streamslice plot?
Here: clc, clear, close; X = linspace(0,1.5); Z = linspace(-3,3); [z,x] = meshgrid(Z,X); ui = -0.04545*x.^2.*z; vi = x.*(-...

3 months ago | 0

Gensurf / Axis Limitations
Try this: set(gca,'ZLim',[0 5]) or zlim([0 5]); % with bracket

3 months ago | 0