正确设置textscan返回空单元格数组 [英] Properly set textscan returns empty cell array

问题描述

我有一个.txt文件，格式为:

I have a .txt file in the format of:

123123  4
123234  4
515511  4
157888  4
854634  4
345661  4

我希望能够将每一列导入不同的变量.我尝试过:

I want to be able to import each column into a different variable. I've tried:

data = textscan(fid, '%f %*[^\n]','HeaderLines',0);   
test = textscan(fid, '%*f %f %*[^\n]','HeaderLines',0);

成功导入数字的第一列，但是test返回[].

Which successfully imports the first column of numbers however test returns [].

是什么原因造成的?

推荐答案

此刻您正在扫描整个文件两次 -这不是一个好主意.

At the moment you're scanning the whole file two times - that's not a good idea.

那 导入 在一个变量中然后将其拆分?

So how about importing everything in one variable and splitting it up afterwards?

DATA = importdata('myFile.txt',' ',0)

data = DATA(:,1);
test = DATA(:,2);

clear DATA

请注意，如果您有标题行，则代码会有所不同:

Be aware that if you have headerlines, the code varies a little:

headerlines = 5
DATA = importdata('myData.txt',' ',headerlines)

data = DATA.data(:,1);
test = DATA.data(:,2);

如果空白分隔符' '不起作用，请尝试制表符'/t'.

If the white space delimiter ' ' is not working, try tabulator '/t'.

您的方法不起作用的原因是文件ID fid.想象fid是一包美味的奶酪.通过textscan读取的文件的每一行就像您已经吃了一片奶酪.因此，在您执行命令之后:

The reason why your approach is not working is the file-ID fid. Imagine fid is a pack of tasty cheese. Every line of the file which got read by textscan is like you have eaten one slice of cheese. So after your command:

data = textscan(fid, '%f %*[^\n]','HeaderLines',0); 

没有奶酪了.而且您的第二个textscan通话没有任何操作.要使其正常工作，您需要打开另一包类似的奶酪:

there is no cheese left. And your second textscan call is left without any cheese. To make it work you would need to open another similar pack of cheese:

fid = fopen('myData.txt');
data = textscan(fid, '%f %*f %*[^\n]','HeaderLines',0);   
fclose(fid)

fid = fopen('myData.txt');
test = textscan(fid, '%*f %f %*[^\n]','HeaderLines',0);
fclose(fid)

但是我告诉你，你会发胖.但是，如果您真的想吃奶酪，请按照以下步骤操作:

But I tell you, you will get fat. But if you really want to eat cheese, do it as follows:

fid = fopen('myData.txt');
DATA = textscan(fid, '%f %f %*[^\n]','HeaderLines',0);   
fclose(fid)

data = DATA(1);
test = DATA(2);

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