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Akira Agata


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MathWorks

600 total contributions since 2016

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Answered
How can I reduce periodic noises from my image? Please help
Looking at your image, periodic noise pattern appears around every 20~30 pixel. So I think the first step is to use FFT or DCT a...

3 hours ago | 0

Answered
Averaging hour value of a timetable
How about the following solution? % Create sample timetable Time = datetime(2019,1,1,0,0,0) + hours(0:239)'; Value = rand(240...

2 days ago | 1

Answered
Problem using for loop
How about limiting the loop from 3 to length(a)-2, like the following? Also, if your calculation process in the inner loop can ...

9 days ago | 0

Answered
Smooth data for slowly-sampled data
How about applying interpolation? The following is an example: % Original data time = 1:10; value = rand(1,10); % Apply i...

9 days ago | 0

Answered
フォルダ内のmri画像に値してアンシャープマスキングを行って,三次元配列に格納したい
forループのなかのimsharpen関数への入力引数が、char型になっているように見えます。 たとえばforループ内の2行を以下のように変更すると、いかがでしょうか? I = imread(imFiles(k).name); % 格納 s...

12 days ago | 0

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Answered
Plotting 3D for three columns of data
How about using scatteredInterpolant function? The following is an example: D = xlsread('LMS.xlsx'); F = scatteredInterpola...

15 days ago | 1

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Answered
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 ...

24 days ago | 1

Answered
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(...

25 days ago | 0

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Answered
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...

25 days ago | 1

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Answered
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...

25 days ago | 0

Answered
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...

25 days ago | 1

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Answered
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...

25 days ago | 1

Answered
不規則な位置座標に値を格納,プロット
単純に、それぞれのデータ点をnの値に応じた色で表示するには、以下のようにすれば可能です。データ点が十分にあるようであれば、scatteredInterpolant関数で内挿して、等値面などの形で表示するという方法もあります。 figure scatte...

25 days ago | 0

Answered
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'); ...

27 days ago | 1

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Answered
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...

27 days ago | 0

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Answered
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...

1 month ago | 0

Answered
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'}; ...

1 month ago | 1

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

1 month ago | 1

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Answered
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...

1 month ago | 0

Answered
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...

1 month ago | 0

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

1 month ago | 0

Answered
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...

1 month ago | 0

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Answered
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;... ...

1 month ago | 0

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Answered
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...

2 months ago | 0

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Answered
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 ...

2 months ago | 0

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Answered
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...

2 months ago | 0

Answered
ファブリペロー干渉計について
初期パラメータを以下のように想定して計算したところ、波長によっては透過率(=出力光電力/入力光電力)が 1 を超えるという結果になっています。記載頂いた式のどこかに誤りがあると思われますので、再度ご確認頂けないでしょうか。 % 設定パラメータ Rx =...

2 months ago | 3

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Answered
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...

2 months ago | 1

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Answered
Simplifying an array with repeat values in it
How about the following? load('data.mat'); [g,tbl] = findgroups(data(:,{'partnumber','description'})); QYT = splitapply(@sum,...

2 months ago | 0

Answered
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.

2 months ago | 0

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