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Akira Agata

MathWorks

Last seen: Today |  Active since 2016

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Answered
How can I write a csv file by row or by column
How about the following? % Sample data (1-by-3 cell array) output = {... uint8(randi([0 255],100,1)),... uint8(randi([0 ...

6 days ago | 0

Answered
非表示にしたfigureが複数ある場合において，編集対象の「現在のfigure」を非表示のまま変更したい
figure を作成する際にあらかじめ figure ハンドルを取得しておくことで、gcf を使わなくてもそれぞれの figure を操作可能です。例えば、以下のようにすれば 2 つの figure に対するハンドル hFig1, hFig2 を取得できま...

6 days ago | 1

| accepted

Answered
Excluding types of extension files on a loop
You can do that more effective way by using wild card character "*", like: imgFolder = pwd; % <- set to your image folder path ...

12 days ago | 2

Answered
Tableからデータを抽出する方法
下記のような方法はいかがでしょうか？ % データ読み込み T = readtable('Book2.xlsx'); % xのdiffを取る (xが一定の区間は0となる) d = [0; diff(T.x)]; % xが増加している部分 (...

12 days ago | 0

Answered
how to generate and cover all the possible arrays using two enties
Another possible solution: [p,q,w,s] = ndgrid({'H','C'}); A = [p(:),q(:),w(:),s(:)]; disp(A)

15 days ago | 0

Answered
イメージの行列の計算について
小数点以下が切り捨てられてしまうのは、読み込んだ画像が uint8 型の配列としてワークスペースに取り込まれるためです。いったん double 型の配列に変換したうえで 255 で割る、ということもできますが、0~1 の範囲にスケーリングしたいということで...

16 days ago | 2

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Answered
how to convert bmp image to Bpg
Unfortunately, currently BPG image format is not supported. As a workaround, how about installing bpgenc from the following sit...

18 days ago | 0

Answered
散布図上で円のフィッティング
いろいろな解決法があるかと思いますが、fminsearch を使って円をあらわす式の係数を推定するのはいかがでしょうか？ 以下はその一例です。 x = [x1,x2,x3,x4,x5,x6,x7,x8,x9,x10,x11,x12]; y = [y1...

18 days ago | 1

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Answered
Bit Error Rate (BER) performance of different digital modulation schemes such as Binary Phase Shift Keying (BPSK),
I believe the following documentation page would be help: https://jp.mathworks.com/help/comm/ref/berawgn.html

19 days ago | 0

Answered
Add missing numbers of 0's and 1's in an array
How about the following? % Sample data x = [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0]; % Calculate run...

20 days ago | 0

Answered
Read csv-style file with header and subtitle
How about the following solution? T = string(readcell('tableExample.csv'));

22 days ago | 0

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Channel


Data

1 month ago

Answered
What methods can be used for lossless audio compression?
I believe the most simplest way to save data as a lossless audio file using MATLAB is audiowrite. This function can save data a...

1 month ago | 1

Answered
get the distances between points
How about the following solution? load('xy_coordinate.mat'); % Calculate distance between each node D = pdist(xy); % Con...

1 month ago | 2

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Answered
How to export array elements?
How about the following? A = (1:20)'; N = numel(A); idx = mod(0:N-1,10)' <= 1; X = cell(5,1); for kk = 1:5 X{kk} = A...

1 month ago | 0

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Answered
char array to pick
The solution should be: b = a(:,2:3);

3 months ago | 0

| accepted

Answered
Help with findgroups command
Like this? a = {... 'apples' 1 2;... 'orange' 2 3;... 'apples' 3 4;... 'Pear' 4 5;... 'apples' 5 6;}; % Ext...

3 months ago | 0

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Answered
List of Node pairs
Another possible solution: numNode = 4; [r,c] = find(~eye(numNode)); v = [c,r]; >> v v = 1 2 1 3 ...

3 months ago | 1

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Answered
cell配列内の特定の行を取り出し，それらの行を一つのcell配列にまとめることはできますか？
対象の cell 配列を C1 とすると、以下のようにして抽出可能です。 idx = cellfun(@(x) x == 4, C1(:,3)); C2 = C1(idx,:);

3 months ago | 0

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Answered
テーブルと構造体の結合
変数 B が数値配列ということでしたら、array2table で table 型に変換できます。 T = [A, array2table(B)];

3 months ago | 1

Answered
Trying to set Y-Axis to Minutes:Seconds for swim times. Would like to set range from 0 to 3:30 and eliminate leading zeros
How about the following solution? % Sample data t = 0.25+3*rand(100,1); % Create boxplot figure boxplot(t) d = 0:0.5:3.5...

3 months ago | 0

Answered
plotting bar graph using matlab
How about using a stem plot? The following is an example: tt = readtimetable('data.txt'); figure stem(tt.Time, tt.Var1,'Ma...

3 months ago | 1

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Answered
How to find local peaks in a 3D plane
How about the following? % Load data load('positionsplane.mat'); % Arrange it as a table variable tData = array2table(posi...

4 months ago | 0

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Answered
Linear Interpolation hard task
As @Walter Roberson -san suggested, timetable and retime is the best solution. Please try the following: TT = readtimetable('_s...

4 months ago | 0

Answered
How can I extract unique pairs of matrix in reverse order?
How about the following way? A = [... 1 1 2;... 2 1 4;... 3 2 1;... 4 2 3;... ...

4 months ago | 0

Answered
findpeaks関数を使って暗い画像の中に存在する広がりのある輝点を検出したいのですが、方法はありますか？
試しに簡単なプログラムを作成してみました。行方向と列方向でピークを検出してプロットすると、検出されたピーク点は輝点の上に十字型に表示されます（右図）。ただ、輝点内の輝度分布によっては十字の縦と横の線がきれいなラインにならない場合や、中央でクロスしない場合な...

4 months ago | 1

Answered
findpeaksの閾値設定について
@Ibuki Takahashi さん、ご説明ありがとうございます。 「xの値の範囲が10以下の時」という条件を、「ピークの半値全幅 (FWHM: Full Width at Half Maximum) が 10以下の時」と近似的に読み替え可能でしたら、...

4 months ago | 1

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Answered
Reed Solomon encoding/decoding for binary data
Since RS system object has 'BitInput' option, I would recommend using comm.RSEncoder rather than rsenc if you want to evaluate F...

4 months ago | 1

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Answered
How to quickly find out the repeat integers in an array?
I believe it's time to use accumarray function! How about the following? A = [4 20 5 4 7 5 9 5 31]; B = accumarray(A',1); ...

5 months ago | 0

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Answered
8 - bit linear feedback shift register
How about using comm.PNSequence in Communications Toolbox?

6 months ago | 0

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