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# Akira Agata

### MathWorks

594 total contributions since 2016

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Detect the vertical dark layers in greysacale image
By applying findpeaks function (with appropriate option settings) to the average intensity profile, you can detect locations of ...

2 days ago | 1

Generate a diagonal matrix from the elements of another matrix
I would recommend using diag function. The following is an example: A = [1 2 3 4 5; 6 7 8 9 10]; A = A'; output = diag(...

2 days ago | 0

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How do you order the results of the combination?
Like this? % Create 1-by-14 cell array {'a','b', ..., 'n'} str = 'a':'n'; c = split(str,'')'; c([1 end]) = []; % Create a...

2 days ago | 1

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Extract specific rows of a cell
OK. Then, to avoid misunderstanding, let's use a simple example. Say, A is a 1-by-3 cell array and r = 4, as follows: A = {ran...

2 days ago | 0

How to draw grid lines at specific x- and y-ticks?
How about using xline and yline functions? The following is an example: % Sample plot figure scatter(-1+2*rand(100,1),-1+2*r...

2 days ago | 0

How display a log space bar figure ?
Please set YScale property of the axes to 'log'. The following is an example. maxV_l = [0.015232 0.020273 0.0069196 0.012027...

2 days ago | 1

2 days ago | 0

How to create filename with variable within loop
How about the following? T = readtable('Stations coordinates.txt'); fileName = append('Hourly Data ',T.Station,' 2015.txt'); ...

4 days ago | 1

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How to replace elements in a integer vector with chars using a lookup table
How about the following way? % Sample data A = randi([0 6],10,1); B = table(compose('Str %d',1:7)',(0:6)',... 'VariableNam...

4 days ago | 0

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Interpolate 1 array to another
If you don't have the Image Processing Toolbox, interp2 would be your friend, like: % assuming array1 is a 5x9000 numeric array...

8 days ago | 0

How to replace the empty cells in a cell array by a 4-bits string?
How about the following? load('Key.mat'); idx = cellfun(@isempty,Key); % Find the indexes of empty cell Key(idx) = {'0000'}; ...

8 days ago | 1

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merge values of a vector
Like this? x = 1:4; % sample input array s = num2str(x,'%d'); y = str2double(s); >> y y = 1234

8 days ago | 1

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writing in a pre-existing txt file ?
Assuming the pre-existing text file is data.txt, how about the following? cInput = readcell('data.txt','Delimiter','\n'); cA...

12 days ago | 0

How can I extract the harmonic related numbers from a matrix?
How about the following? x = [90 100 110 200 220 250 300 330 340 400 420 500]; tfUsed = false(size(x)); R = x./x'; idx = R...

12 days ago | 0

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Machine Learning Signal Processing Help
I believe one good starting point would be descriptive statistics listed in this page (Signal Processing Toolbox), or Diagnostic...

13 days ago | 0

splitting dataset into training set and testing set
You can split your dataset by using partition function, like: [setTrain, setTest] = partition(faceDatabase, [0.8, 0.2], 'random...

13 days ago | 0

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how to create multiple matrix from a single matrix
If you have Image Processing Toolbox, how about the following? % Sample data A = [... 1 2 3;... 4 5 6;... 7 8 9;... ...

21 days ago | 0

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change color of outlier limit in box plots
How about the following solution? % Sample data x = randn(1000,4); % Create boxplot without outlier markers figure boxplo...

23 days ago | 0

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how do I add msec to datetime?
Please set the display format to show millisecond, like: >> Ts.Format = 'uuuu/MM/dd HH:mm:ss.SSS'; >> Ts Ts = datetime ...

29 days ago | 0

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How to replace elements of matrix by elemts from array
Basically, this task can be done by: NewV = reshape(x,8,[])'; But in your case, length(x) can NOT be devided by k (=8). So you...

1 month ago | 0

ファブリペロー干渉計について

1 month ago | 3

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Overlay curves over heatmap
How about the following way? Plot the heatmap Add axes over the heatmap Plot lines on the axes Set the background color of t...

1 month ago | 1

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Simplifying an array with repeat values in it

1 month ago | 0

Error in the medical image display
How about the following? imshow(T_1,[]); In addition, I believe the line 'T_1 = squeeze(C);' can be deleted.

1 month ago | 0

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plotting date from datetime array
'Y' should be a captal letter. Please try: histogram(d.Year)

1 month ago | 0

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to determine rainfall data
I would recommend using timetable and retime functions, rather than using for-loop. The following is an example: % Read data ...

2 months ago | 0

Cycle counting from 0
How about the following? x = [0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 0 0 0 0 1 1 1 1 1 0 0 0 0 0]; str = num2str(...

2 months ago | 0

How to fit an ellipse to an image in matlab.
How about the following? % Read image I = imread('diskimage1.jpeg'); % Binarize Igray = rgb2gray(I); BW = imbinarize(Igra...

2 months ago | 0

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Changing gregorian date number to calendar date and time
If your time vector represents hours since 1900-01-01 00:00:00.0 , following code can convert it into yyyy-MM-dd. T = datetime...

2 months ago | 1

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