Community Profile

# Akira Agata

### MathWorks

656 total contributions since 2016

View details...

Contributions in
View by

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...

2 days ago | 0

| accepted

Best to import and plot one large csv file

4 days 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 days ago | 1

| accepted

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...

8 days 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...

24 days 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 ...

25 days ago | 2

| accepted

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 =...

26 days ago | 2

| accepted

classify関数によって得られた確率をROC曲線の出力をすることは可能でしょうか？
classify 関数によって得られた確率（スコア）からROC曲線を出力をすることは可能です。そのためには、プログラムを若干修正する必要があります。 まず、perfcurve 関数への入力は、エラーメッセージにもあるように「スコアは浮動小数点のベクトルと...

27 days ago | 4

| accepted

How to subset a table and pass the variable names?
Instead of using T2 = T{Ind,:} (I believe TT{Ind,:} is typo and T{Ind,:} is correct), the following can extract the correspondin...

28 days ago | 0

| accepted

Change text to numbers in a cell
How about the following? B = replace(A,'text one','1'); B = cellfun(@str2double,B(:,1:end-1),'UniformOutput',false); A = [B,A...

28 days ago | 1

| accepted

How can ı creat poisson random variables?
You can generate random number by using poissonrnd function, like; lambda = 75; r = poissrnd(lambda); Or, if you want to gene...

29 days ago | 0

| accepted

How calculate daily, monthly, seasonally mean average and std?
I would recommend storing the data as timetable variable, and applying retime function. The following is an example: % Load da...

29 days ago | 0

| accepted

Monthly Average from Daily Data
Another way is to use groupsummary function. The following is an example (note that the follwing returns average value with nan...

29 days ago | 0

さっそく対象データを提供頂き、ありがとうございます。 MATLABには流線をプロットするための関数として、streamline が用意されています。ただ、この関数は入力データがメッシュグリッドになっている必要があります。 頂いたデータを見ますと (x,...

1 month ago | 1

| accepted

How to normalize data of each row of Matrix A=[10 20 30 40;5 15 25 30]; between 0 and 1?
I believe you can do this task by simply applying normalize function, like: B = normalize(A,2,'range'); % Normalize each row to...

1 month ago | 0

ライブスクリプトのFigureを外に出す

1 month ago | 1

| accepted

make video to combine two png series from different file folder
How about the following solution? s = dir('*.png'); v = VideoWriter('output.avi'); open(v); for kk = 1:numel(s) fil...

1 month ago | 0

| accepted

Merge two files with different information

2 months ago | 0

extracting only number from text file
How about the following? % Read the original text file c = readcell('data.txt','Delimiter','\n'); % Extract coordinates fro...

2 months ago | 0

| accepted

for文とif文の併用
やりたい内容は、「条件 Y(k) <= sr & Y(k+1) >= sr を満たす点での dY/dX の値を計算し、結果を配列 C として保存したい」と理解しました（間違っていたらご指摘ください）。 以下の方法ではいかがでしょうか。ただし上記条件を満た...

2 months ago | 1

Determine separated node in graph
I'm not sure what is the final goal and/or application of this process. But let me try to do this task (since this "puzzle" will...

2 months ago | 0

| accepted

how to create block circulant matrix?
How about the following? % For simple example n = 3; m = 2; % Create n-by-n circulant matrix B_block = gallery('circul',1...

2 months ago | 0

| accepted

Creating a matrix which contains submatrices
Assuming the submatrix is n-by-n Identity matrix, the solution would be like this: n = input('Please enter n: '); subMat = eye...

2 months ago | 0

Merge two columns of same table into one
Assuming columns A and B are cell array of characters, how about the following? % Sample input table A = {'123';'234';'345'}; ...

2 months ago | 0

| accepted

plotを使用してグラフの色をデータに応じて変更する方法

2 months ago | 1

How to filter tables in the cell?
How about the following? C_Winter = cellfun(@(x) x(strcmp(x.season,'Winter'),:),C,'UniformOutput',false); The same solution wi...

2 months ago | 1

| accepted

How to plot binary sine function?
How about modulating a phase with 0 <-> pi ? The following is an example: T = 3; time = linspace(0,T*4,1000); % Create a p...

2 months ago | 0

| accepted

Box plotのボックス内の色を変更する方法
R2020aでMATLABの基本関数に追加されたboxchartを使うのはいかがでしょうか？ たとえば以下のようにすると、Box内と外れ値のマーカー色をグレーに指定することができます。 figure boxchart(x,'BoxFaceColor'...

2 months ago | 1

make one part of a function repeat it self in diffrent sections of time line.
If you have a Signal Processing Toolbox, you can simply use sawtooth function, like: % Generate signal t = linspace(-4*pi,4*pi...

2 months ago | 0