来自列的值的平均值/跳过行（textscan） [英] Average of values from a column/ Skip lines (textscan)

问题描述

  ****** text ***** ** 
（30行包含文本和*）
 ******文本******* 
 
abc 
abc 
abc 
abc 
abc 
abc 
abc 
  

与一个as x和b和c作为y1和y2）

如何跳过这30行textscan？

$ p $ [x y1 y2] = textscan（'file_name.txt'，'％ f％f％f'，30）;


更多：如何使第三列的值平均值？ b $ b

解决方案

如何跳过某些行被处理？

关于跳行：

• 如果行数始终是静态的，并且始终在文件的开头：
  
  

  传递 HeaderLines 的值为N，N代表您不希望的数字
  
  

  [x y1 y2] = textscan（'file_name.txt'，'％f％f％f'，'HeaderLines' ，30 + 2）;




• 如果所有行都以相同的字符串开头

  
  
  

  *通过 CommentStyle ，其中 ABC 如果所有行都跳过以 * 开始，则传递'*' 到 textscan 。

  
  
  

  [x y1 y2] = textscan（'file_name.txt'，'％f％f％f'，'CommentStyle'，'*'）;




---

如何获得某个数组的平均值？

一些数组，使用 mean ：

  y1_average = mean（y1）; 
  

---

textscan ：

• 从文本文件或字符串读取格式化的数据 - MATLAB
  

的平均值
$ b

• 一个数组的平均值或平均值 - MATLAB

I have a .txt file which looks like this:

******text*******
(30 lines containing text and *)
******text*******

a b c
a b c
a b c
a b c
a b c
a b c
a b c

(I'm creating a plot with a as x and b and c as y1 and y2)

How do I skip those 30 lines with textscan? I had this but it didn't work:

[x y1 y2] = textscan('file_name.txt', '%f %f %f', 30);

And more: how to I make the average of the values of third column?

解决方案

How do I skip certain lines from being processed?

You have a few options regarding line skipping:

• If the number of lines are always static, and always in the beginning of the file:

  Pass HeaderLines with a value of N, with N being the numbers you'd like not to process.

  [x y1 y2] = textscan ('file_name.txt', '%f %f %f', 'HeaderLines', 30 + 2);

• If all lines start with the same character string

  *Pass CommentStyle with a value of ABC where ABC is the comment style.

  If all lines to skip start with *, pass '*' to textscan.

  [x y1 y2] = textscan ('file_name.txt', '%f %f %f', 'CommentStyle', '*');

---

How do I get the average of some array?

To get the average of some array, use mean:

y1_average = mean (y1);

---

Documentation of textscan:

• Read formatted data from text file or string - MATLAB

Documentation of mean

• Average or mean value of array - MATLAB

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