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關於textscan in matlab 在 [討論] 請問textscan用法- 看板MATLAB - 批踢踢實業坊的評價
關於textscan in matlab 在 1_3a How to read data from text file in MATLAB | Facebook 的評價

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2021-10-01 13:19:08 有 9 人看過有 1 人喜歡

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textscan in matlab 在 [討論] 請問textscan用法- 看板MATLAB - 批踢踢實業坊的必吃

作者profyang (prof)

看板MATLAB

標題[討論] 請問textscan用法

時間Sun Mar 24 18:52:03 2019

本來matlab讀檔都寫得很隨意(用fgetl之類的一行行讀)

據說大檔案但有規律的用textscan讀起來蠻快的

但我的檔案內容類似這樣:

0: 0
1.55853637077072
1.55853643267316
1.55853630886829
1.55853624696587
-0.00134146529463404
1
1: 1e-13
1.55853637077072
1.55853643267316
1.55853630886829
1.55853624696587
-0.00134146529463405
1
2: 2e-13
1.55853637077072
1.55853643267316
1.55853630886829
1.55853624696587
-0.00134146529463405
2

總之應該可以看出就是0:開頭到1:前一行是一組

1:到2:前一行又是一組以上共是3組

而我面對的檔案總共有至少上萬組甚至十萬組要讀

這樣要怎麼寫比較好?直接textscan(fid,'%f')的話卡了個0:和1:這種東西

想把':'和'\n'換行符號都當成delimiter好像也不讓我這樣寫:

textscan(fid,'%f','delimiter',{':','\n'})

又不想一行行fgetl之類的判斷然後讀有沒有比較好的寫法呢?謝謝!

--

※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 118.166.216.213
※ 文章網址: https://www.ptt.cc/bbs/MATLAB/M.1553424727.A.0B3.html

→ book5601: 你的檔案來源如果是自己寫的程式跑出來的值，就直接該改 03/24 23:26

→ book5601: 程式碼變成好讀不就好了。 03/24 23:26

→ book5601: 如果不是，我可能會直接Ctrl+H取代不要的符號哈哈哈(趕 03/24 23:29

→ book5601: 時間的做法 03/24 23:29

推 physbook: 法1. 先用文字編輯器把換行符號取代成自訂的分隔符號 03/25 08:00

→ physbook: 法2. 搭配迴圈讀各組的值 03/25 08:01

取代是也可以

但是我這個是一個加密檔轉出來的ASCII文字檔

等於我要加密轉檔ASCII=>ASCII讀進matlab(這篇問的部分)

這過程我希望可以是全自動的不然加密轉檔等半天也不知道好了沒

然後才又手動取代再用matlab讀好麻煩

當然用matlab取代也可行但這樣效率是不是不會比我直接用迴圈讀快?
※ 編輯: profyang (114.37.132.205), 03/25/2019 08:42:49

... <看更多>

textscan in matlab 在 1_3a How to read data from text file in MATLAB | Facebook 的必吃

How to read data from text files in MATLAB, using textscan and fopen functions. Resource/material used in this video is available here:... ... <看更多>

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C = textscan( fileID , formatSpec ) reads data from an open text file into a cell array, C . The text file is indicated by the file identifier, fileID .

#2. 从文本文件或字符串读取格式化数据- MATLAB textscan

C = textscan( fileID , formatSpec ) 将已打开的文本文件中的数据读取到元胞数组 C 。该文本文件由文件标识符 fileID 指示。使用 fopen 可打开文件并获取 fileID 值。

#3. textscan (MATLAB Functions)

The textscan function regards a text file as consisting of blocks. Each block consists of a number of internally consistent fields. Each field consists of a ...

#4. matlab 中的textscan - 台部落

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#5. MATLAB Language Tutorial => textscan

MATLAB Language Reading large files textscan. Example#. Assume you have formatted data in a large text file or string, ...

#6. matlab中textscan和textread函数的比较使用 - CSDN博客

原文地址：matlab中textscan和textread函数的比较使用作者：sylvain通过看其他热心网友的总结帖以及自己一点实践，简单说一下使用这个两个函数时需要 ...

#7. textread (MATLAB Functions)

[A,B,C,...] = textread('filename','format') reads data from the file 'filename' into the variables A,B,C, ...

#8. how to use textscan in matlab - Stack Overflow

fileID = fopen('Uz10.txt'); % Uz10=textscan(fileID,'%d:%d'); Uz10=textscan(fileID,'%s'); fclose(fileID);. Output: >> Uz10{1} ans = '0:00' '0:10' ...

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新增的textscan 函式方便您存取任何格式的大型文字檔案。此函式之功能類似於textread 函式，但加入了指定檔案尋找工具(file identifier) 之功能，方便使用者在檔案中 ...

#11. CS 211 Lesson 24 Text (formatted) File Input/Output

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Textread is a function which handles many of the problems/tasks of file input for you. The syntax for textread is : "array_variable = textread( file_name );".

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#19. Matlab文件讀取總結- 碼上快樂

textscan 與textread的區別：. textread不用先fopen那個文件，適用於格式統一的txt文件的一次性大批量讀取。而使用textscan函數之前需要 ...

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【转】matlab的textscan与textread区别. 小新新的蜡笔 2019-03-13 原文. 1、基本语法 textscan的基本语法是： C = textscan(fid, 'format')

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#23. [討論] 請問textscan用法- 看板MATLAB - 批踢踢實業坊

本來matlab讀檔都寫得很隨意(用fgetl之類的一行行讀) 據說大檔案但有規律的用textscan讀起來蠻快的但我的檔案內容類似這樣: 0: 0 1.55853637077072.

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matlab 中的textscan 下面开始textscan函数,其实基本和textread差不多, ... C= textscan(fileID,formatSpec)将已打开的文本文件中的数据读取到元胞数组C。该文本文件由 ...

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#75. Textscan mit verschiedenen Formatdaten - Matlab - Living Sun

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#83. 如何使用textscan在Matlab中讀取多行？ - 優文庫

我用這個： weights=fopen('indices.txt'); weights=textscan(weights, '%d %d %d %d %d %d %d') 但這只是我的讀取文件的第一行。我的文件看起來像這樣： 0 90 100 5 ...

#84. Comparison of textscan and textread functions in matlab

Original Address: Comparison of the use of matlab textscan and textread ... must be strictly in accordance with the usage of data=textread(filename,format,N).

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