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matlab struct array initialize 在 Re: [討論] structure array 初始化大小- 看板MATLAB 的推薦與評價


作者celestialgod (天)
看板MATLAB
標題Re: [討論] structure array 初始化大小
時間Fri Dec 25 14:42:40 2015

※ 引述《qazzzzz (:D)》之銘言：
: 第一次在這發言，請多多指教...><
: 我是想要建一個 structure array，
: 而且想要一開始就設定好他有多大，
: 可是看到網路上的範例都是依序把資料加上去，
: 雖然這樣也是可以寫得出來啦...
: 可是就覺得不太習慣，
: 覺得在一開始 create variable 的時候就定義好它大小會比較舒服...><
: 例如，我已經知道我有 100 個學生，
: 每個學生都有一個名字、和許多個 email (每個學生有不同數目的 email)
: 目前都是用 for loop 寫:
: for i = 1 : 100
: student(i).name = '他的名字';
: student(i).email = [email1 email2 ...]
: end
: 想問問大家有沒有可以在一開始定義 student 是 100 個的寫法?
: 謝謝大家><

回一下舊文，最近發現struct其實可以當成array處理

也可以用arrayfun處理struct array

更重要的事情是，initialize的事情也迎刃而解了，用repmat即可

student = repmat(struct('name', [], 'email', []), 100, 1)

這種應用，像是plot時，回傳的是struct也可以這樣做~~

最近遇到，順便分享一下


arrayfun + struct應用：

ex:

1. 取得每一個struct的內容 (字串可以變成cell，數字可為array)
arrayfun(@(x) x.name, dir(), 'uni', false)
% 得到當前目錄下全部檔案名稱(以cell儲存)，ls是字串，而且在mac跟windows行為不同

arrayfun(@(x) x.bytes, dir())

2. 透過struct array去對每一個struct的資料做處理
datas = repmat(struct('x', [], 'y', []), 100, 1);
for i = 1:100
numData = randsample(10:100, 1);
datas(i).x = randn(numData, 1);
datas(i).y = 1 + datas(i).x * 2 + randn(numData, 1);
end
lmModels = arrayfun(@(d) fitlm(d.y, d.x), datas, 'uni', false);

--
R資料整理套件系列文：
magrittr #1LhSWhpH (R_Language) https://tinyurl.com/1LhSWhpH
data.table #1LhW7Tvj (R_Language) https://tinyurl.com/1LhW7Tvj
dplyr(上) #1LhpJCfB (R_Language) https://tinyurl.com/1LhpJCfB
dplyr(下) #1Lhw8b-s (R_Language)
tidyr #1Liqls1R (R_Language) https://tinyurl.com/1Liqls1R
--
※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 140.109.74.87
※ 文章網址: https://www.ptt.cc/bbs/MATLAB/M.1451025763.A.697.html
※ 編輯: celestialgod (140.109.74.87), 12/25/2015 16:53:47
推 s4300026: 推薦這篇文章 12/27 14:24
推 kusoer1017: 推薦這篇文章 01/19 20:09






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matlab struct array initialize 在 An example using structure arrays in MATLAB. - YouTube 的推薦與評價

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An example using structure arrays in MATLAB. Tutorials by MATLAB Marina. For more information, please visit: ... ... <看更多>

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