How can open and read .dat file?

SM
2020 9 8
1 个回答
更新时间：2020 11 4
142 次查看（30 天）

0 个投票

A=[3 4 4 NaN NaN NaN NaN NaN;
36 46 4 4 1 3 NaN NaN;
24 32 3 3 1 3 2 3;
25 32 3 3 1 3 2 NaN];
I have stored this matrix as a .dat file using following code:
filename = sprintf('output.dat');
dlmwrite(filename, A, ' ' );
Now I want to open (fopen) this "output.dat" file in read mode and want to read data from this open file using fscanf. How can I do that?
any help would be greatly appreciated.
Thank you!

2 个评论
显示 无 隐藏 无

Rik
Rik 2020-9-8
What did you try?
SM
SM 2020-9-8
The matrix A has been stored in output.dat file in my computer. Now I want to read data from the output.dat file using fopen and fscanf. I have used the following code:
fileID = fopen('output.dat','r');
result = fscanf(fileID,'%f')
It results single column array but I need the output in the following format:
result=[3 4 4 NaN NaN NaN NaN NaN;
36 46 4 4 1 3 NaN NaN;
24 32 3 3 1 3 2 3;
25 32 3 3 1 3 2 NaN];
or,
result=result={[3 4 4]; [36 46 4 4 1 3]; [24 32 3 3 1 3 2 3]; [25 32 3 3 1 3 2]};

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Walter Roberson
Walter Roberson 2020-9-8

0 个投票

result = load('output.dat');

4 个评论
显示 2更早的评论 隐藏 2更早的评论

SM
SM 2020-9-9
Appreciated! but I want in different way. I have explained in my comment about how I have tried to solve it. Could you proceed that way?
Walter Roberson
Walter Roberson 2020-9-9
You cannot solve the problem using fscanf() unless you already know the number of columns in advance.
You can solve the problem by looking with fgets() or fgetl() to pull in one line at a time, and sscanf() that line, and check the lines for consistency of lengths.
You can also solve the problem with dlmread() or with textscan(). If you use textscan then you can pass in '' (empty string) as the format, which is an undocumented option that will figure out how many columns there are for numeric use.
You can also use readmatrix() for R2019b or later.
Huy Le Van
Huy Le Van 2020-11-4
编辑：Rik 2020-11-4
I can not read file.dat.
Do you replay follow email []@gamil.com
Walter Roberson
Walter Roberson 2020-11-4
dat is not a fixed file format. It is used by many different programs for whatever data they have handy. You would need to know which program created the file to try to figure out what the file format is.

请先登录，再进行评论。

类别

在 帮助中心 和 File Exchange 中查找有关 Large Files and Big Data 的更多信息

标签

提问:

SM
SM
2020-9-8

评论：

Walter Roberson
Walter Roberson
2020-11-4

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by