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# Akira Agata

### MathWorks

678 total contributions since 2016

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findgroups と splitapply を使う方法はいかがでしょうか？ A = [600 142 30 75 13; 600 141 30 75 14; 600 142 30 80 14]; group = findgroups(A(:,4))...

13 days ago | 0

plot3でのエラー解決方法
waterfall 関数を使って、ウォーターフォールプロットとして可視化するというのは如何でしょうか？ 以下は簡単な例です。 % Sample data t = 0:0.1:20; data = zeros(7,numel(t)); for kk...

13 days ago | 0

How to binarize a grayscale image with multiple thresholds?
Assuming a grayscale image img is a 2D double array, the following code should work: b = img > t1 | img < t2;

19 days ago | 0

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scatter 関数の第4引数で各ポイントの色をコントロールすることができます。例えばご質問のプログラムですと、以下のようになります。 scatter関数の詳細は以下をご参照ください。 https://jp.mathworks.com/help/mat...

26 days ago | 0

Plotting target points within an n radius plot
How about the following solution? % Data points (N = 10, for example.) numPoints = 10; detRange = 2*pi*(rand(numPoints,1)); ...

27 days ago | 0

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Hi I need help with for loop
No need to use for-loop. How about the following way? % Read data file T1 = readtable('A1_input.txt'); % Postion of (x,y) a...

2 months ago | 0

Remove noise from image
How about applying median filter? The following is an example: % Read the image and convert it to grya-scale I = imread('gray...

2 months ago | 0

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2 months ago | 0

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imagesc を使ってデータをヒートマップとして可視化するのはいかがでしょうか？ ご参考までに、簡単な例を作成してみました。 % Sample Data x = linspace(0,2*pi); y = 0.01 + sin(x).^2; ...

2 months ago | 1

How to convert a cell to matrix?
How about the following way? % Convert to numeric array maxLen = max(cellfun(@numel,A)); A = cellfun(@(x)[x, NaN(1,maxLen - n...

3 months ago | 1

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join tables by categorical variable
Please try innerjoin or outerjoin functions, like: c1 = innerjoin(a,b,'Keys','Var1'); c2 = outerjoin(a,b,'Keys','Var1','MergeK...

3 months ago | 0

remove nodes without changing the numbering of nodes
How about setting a nodelabel for each node? The following is an example: s = [1 1 1 2 2 3]; t = [2 3 4 3 4 4]; % Create a...

3 months ago | 0

How to change color bar limits in imagesc?
You can do that task by setting CLim of the axes, like: figure imagesc(rand(4)); ax = gca; ax.CLim = [0 1]; colorbar

3 months ago | 1

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why does the sound with different sampling frequency sounds the same ?
That's the basic of the 'Sampling theorem'. As long as frequency component of the signal is less than Nyquist frequency ( = samp...

3 months ago | 0

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fit結果の各項目毎のプロット

3 months ago | 0

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create a matrix using a vector such that each row is one offset of the previous row
If the output matrix is always N-by-3, the following straight-forward way might be enough: matrix = [v(1:end-2);v(2:end-1);v(3:...

3 months ago | 0

plotコマンドを使わずに、新規figureに元のグラフをコピーをする。
copyobj を使うのはいかがでしょうか？ たとえばご質問頂いた例では、以下のようになります。 figure ax1 = axes('Position',[0.1, 0.55 , 0.8182, 0.4091]); ax2 = axes('Pos...

3 months ago | 0

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グラフ上の座標の取得
figureのコールバック関数 (WindowButtonDownFcn, WindowButtonUpFcn) を使うというのは、いかがでしょうか？ たとえば以下のようにすると、マウスの左ボタンを押した時と解放した時の座標を、それぞれ取得することができ...

3 months ago | 0

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Calculate duration from labeled timestamped data.
Thank you for providing your data. I believe the following is an possible solution. I hope this will be somehow helpful for you...

4 months ago | 0

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How to rescale table columns
normalize function can do that task, like: rescaledTable = normalize(yourTable,'range');

4 months ago | 0

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4 months ago | 0

How to clear dots in image
How about the following? [X,map] = imread('4.png'); X2 = medfilt2(X); imwrite(X2,map,'output.png');

4 months ago | 0

How to condionally keep unique rows in a table
How about the following? idx = (T.e == 2) & (T.f == 3); T_desired = unique(T(idx,:),'rows'); Or, if your original table T has...

4 months ago | 0

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Best to import and plot one large csv file
How about using "tall array" ? I believe the following pages should be helpful for your task: https://jp.mathworks.com/help/ma...

4 months ago | 0

Fill area between plot and the 0-line?
How about using area function? The following is an example: % Sample data x = linspace(0,4*pi,1000); y = sin(x); % Extrac...

4 months ago | 1

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Finding whether the element of the array is present in the other array and finding the index value
Just in case, let me post an example. If you don't need to think about tolerance, intersect function also works. % Example (de...

4 months ago | 0

How to find and color circle in a binary image of circles using sliding window through out the image?
Looking at the original image, target regions are filled with plane color. So I tried to apply the entropyfilt to extract the R...

5 months ago | 1

meshgrid や ndgrid 関数を利用する方法では如何でしょうか？ たとえば [0 1] から重複を許して3つ選ぶという例ですと、以下のようになります。 [x1,x2,x3] = meshgrid([0 1],[0 1],[0 1]); A ...

5 months ago | 2

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ismember 関数を使うと、簡単に見つけることができます。たとえばご質問の例ですと、以下のようになります。 A = 11:20; B = [11 12 14 14]; [~,loc] = ismember(B,A); >> loc loc =...

5 months ago | 2

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