Community Profile

photo

Akira Agata


MathWorks

523 total contributions since 2016

Contact

Akira Agata's Badges

  • Editor's Pick
  • First Review
  • 5-Star Galaxy Level 3
  • First Submission
  • 24 Month Streak
  • Guiding Light
  • Knowledgeable Level 4
  • Solver
  • Revival Level 2
  • First Answer

View details...

Contributions in
View by

Answered
regionpropsの応用について。
bwboundaries 関数を使うのはいかがでしょうか? たとえば以下のようにオブジェクトの境界をトレースできます。 % Sample binary image I = imread('toyobjects.png'); BW = ~imbina...

10 giorni ago | 0

Answered
ignore or delete number or row has been multiply defined?
Simple solution will be: result = unique(yourArray); If you want to keep element's order, please try the following: [~, ia] =...

15 giorni ago | 0

| accepted

Answered
Timetable Monthly Average over Many Years
Looking at your csv data, some additional options will be needed. (1) To specify the delimiter in your csv data, 'Delimiter' op...

16 giorni ago | 1

Answered
change numbering inside cell
Solution 1: c_new = cell(size(c)); for kk = 1:numel(c) c_new{kk} = interp1(B(:,2),B(:,1),c{kk}); end Solution 2: % "...

17 giorni ago | 0

| accepted

Answered
Extract integer number from a cell array.
If my understanding is correct, you are trying to extract numbers just after 'BUS'. If so, how about the following? % Original...

17 giorni ago | 0

| accepted

Answered
Graph each side of the equation
How about using fzero function? The following is an example: % fnc = (left side) - (right side) fnc = @(x) 4.231*x - exp(-0.17...

19 giorni ago | 1

| accepted

Answered
How can I set a descend order finding peaks to my graph ?
How about combining envelope and findpeaks functions? The following is an example. % Load data load('signal.mat'); load('t.m...

22 giorni ago | 2

| accepted

Answered
How to take monthly flow data and obtain annual max flow values
Assuming your data was stored in 972-by-2 matrix yourData, following code can do your task. year = repelem([1:81]',12,1); year...

22 giorni ago | 0

Answered
Remove the border lines.
How about using surf function with 'FaceColor' = 'interp' option, instead. Here is an example. figure surf(xx1,yy1,z1,'FaceCo...

28 giorni ago | 0

Answered
how to count daily events from a time series data
How about the following? % Read your text data file T = readtable('test.txt'); % Create datetime vector Time = datetime(T....

28 giorni ago | 0

| accepted

Answered
Extracting coordinates values for the line.
How about the following? % Load data and convert to gray-scale image load('v.mat'); Igray = mat2gray(v); % Apply multileve...

28 giorni ago | 0

| accepted

Answered
Kmeans (Initialise centroids)
Like this? % Apply k-means clustering to data set X (e.g num of classes = 2), and obtain centroids C numClass = 2; [cluster,C...

28 giorni ago | 0

Answered
plotを使った四分木分割をしたいです。
Image Processing Toolboxの関数 qtdecomp を使うのはいかがでしょうか。 以下はその一例です。 % 与えられた(x,y)座標が1(他は0)の16x16配列Iを作成 a = [2 2; 7 2; 3 7; 6 6; 8 9...

29 giorni ago | 1

| accepted

Answered
connect median in a boxplot
Like this? % Sample data Data = randn(100,10); % Calculate median for each column med = median(Data); % Visualize the r...

circa un mese ago | 0

| accepted

Answered
Return index of datetime column in a table
If your HData.Time column is string: % index of zero seconds idx_s = cellfun(@(x) ~isempty(x),regexp(HData.Time,'00$','match')...

circa 2 mesi ago | 0

| accepted

Answered
surf plot from text file
Like this? data = dlmread('exportfilecst4.txt'); x = data(:,1); y = data(:,2); z = data(:,6); figure surf(reshape(x,31...

circa 2 mesi ago | 1

| accepted

Answered
retime only for specific gaps on time
How about the following solution? % Sample timetable with 2 gaps (e.g >1 hour) Time = datetime('now') + minutes(cumsum(45*rand...

2 mesi ago | 2

| accepted

Answered
How to assign points to multiple polygons using inpolygon
Looking at your data, one of the Points is outside of the convex hull of polygon A's coordinates. So "inpolygon" function will n...

2 mesi ago | 0

Answered
三角形膜要素の分布図(任意の(x,y)座標で)を作成したいのですが、方法はありませんでしょうか。
ご説明ありがとうございます。おおよそ理解しました。 まず、任意の (x,y) 座​標に対して何らかの値 z (例えば関数 z = f(x,y) の出力値)があったとして、それらの隣接する点どうしを三角形で結んで3次元曲面として表示するには、以下のようにす...

3 mesi ago | 1

| accepted

Answered
How can I convert multiple images (all the same size) into one matrix?
To create image dataset for training a neural network, imageDatastore should be an easy and promissing way. So I would recommend...

3 mesi ago | 0

Answered
How to stretch matrix
Not so sophisticated, but intuitively clear way: y = repelem(x,2); y(2:2:end) = y(2:2:end)+1;

3 mesi ago | 1

Answered
Trouble importing similar .txt files using readtable (error: all lines must have the same number of delimiters)
I think the following way would be more stable. % Read data fid = fopen('Error.txt','r'); str = textscan(fid,'%s','Delimiter'...

3 mesi ago | 1

| accepted

Answered
How to detect change in mean value of a signal
It may need to apply "smoothing" before detecting changes larger than 10,000. Looking at your data, ~2000 points movmean will cl...

3 mesi ago | 0

| accepted

Answered
Checking if word/words are present in a sentence in a table cell.
Like this? % A sample data T = cell2table({... 'M3 TRIPPED xyz','abc','pqr';... 'def','M3 TRIPPED 123','ghi'}); % Fin...

3 mesi ago | 1

Answered
Looking for the ways to categorize the black dots by the number of pixels...
I strongly believe the regionprops function will be your help. The following is an example: % Read image and binarize I = imre...

3 mesi ago | 0

| accepted

Answered
積み上げグラフのcolormapについて
たとえば以下のような方法ではいかがでしょうか? % Sample data and color map y = rand(3,10); color = colorcube(size(y,2)); % Visualize the data fi...

3 mesi ago | 1

| accepted

Answered
reverse 3D euclidean distance
There should be 2 answers. Here is my try. P = [3 1 4;12 1 4; 34 2 4]; D = [81 36 601]; func = @(x) (vecnorm(x - P(1,:))-s...

3 mesi ago | 1

Answered
エラーバーグラフの凡例のマーカーからエラーバーを抜く方法
エラーバーチャートの上に空のグラフ(エラーバー無し)を上書きして、そのグラフに対して凡例を指定する、というのはいかがでしょうか? 以下はその一例です。 % Sample data x = 1:10:100; y = 100*rand(1,10); ...

3 mesi ago | 2

| accepted

Answered
How to repeatedly subdive vector rectangle into equal area?
How about using histogram2 function? The following is an example. % make dummy data x = 10*rand(30,1); y = 25*rand(30,1); ...

3 mesi ago | 0

| accepted

Answered
How do you calculate a trajectory through a series of 3D points using cubic splines?
One possible straight-forward way would be like this: Actually, spline interpolation seems to be better than cubic spline... B...

3 mesi ago | 1

Load more