[英]Read formatted text in MATLAB
I have some text files that I want to access them in MATLAB workspace. 我有一些文本文件,我想在MATLAB工作区中访问它们。 MATLAB help says that I can use fscanf
, fgetl
, and textscan
. MATLAB帮助说我可以使用fscanf
, fgetl
和textscan
。 I chose the last one due to the formatted text. 由于文本的格式,我选择了最后一个。 I wrote the below scripts: 我写了以下脚本:
filename = 'myFile.txt';
fid = fopen(filename);
myData = textscan(fid, '%u64 %{dd/MM/yyyy}D %{hh:mm:ss.SSS}T %f64 %f64 %u64 %f64 %f64 %f64\r\n', 'HeaderLines', 3)
fclose(fid);
but I get the error: 但是我得到了错误:
Error using textscan 使用textscan时出错
Unable to parse the format character vector at position 21 ==> %{HH:mm:ss.SSS}T %f64 %f64 %u64 %f64 %f64 %f64 无法解析位置21 ==>%{HH:mm:ss.SSS} T的格式字符向量%f64%f64%u64%f64%f64%f64
Date formats must be of the form %T or %{...}T. 日期格式必须为%T或%{...} T格式。
The formatted texts are as: 格式文本为:
--------------------------------------------------------------------------------------------------
Row Var1 Var2 Var3 Var4 Var5 Var6 Var7 Var8
--------------------------------------------------------------------------------------------------
1 08/04/2018 09:56:52.790 020.00 019.999570 1999690178 055.00 010.020000 000.00000
2 08/04/2018 09:56:52.821 020.00 019.999602 1999690178 055.00 010.020000 000.00000
3 08/04/2018 09:56:52.852 020.00 019.999580 1999690178 055.00 010.020000 000.00000
4 08/04/2018 09:56:52.883 020.00 019.999623 1999690179 055.00 010.020000 000.00000
5 08/04/2018 09:56:52.915 020.00 019.999548 1999690179 055.00 010.020000 000.00000
6 08/04/2018 09:56:52.946 020.00 019.999602 1999690179 055.00 010.020000 000.00000
7 08/04/2018 09:56:52.993 020.00 019.999548 1999690179 055.00 010.020000 000.00000
8 08/04/2018 09:56:53.024 020.00 019.999602 1999690179 055.00 010.020000 000.00000
9 08/04/2018 09:56:53.055 020.00 019.999548 1999690179 055.00 010.020000 000.00000
Use 采用
myData = textscan(fid, '%u64 %{dd/MM/yyyy}D %{hh:mm:ss.SSS}D %f64 %f64 %u64 %f64 %f64 %f64\r\n', 'HeaderLines', 3);
I don't think there is a %T
. 我认为这里没有%T
。 %D
is datetime (for date and time). %D
是日期时间(用于日期和时间)。
I always tend to avoid using fscanf
, importdata
, textscan
and such functions because they can be tricky to deal with and I think their output sometimes is not easy to manipulate. 我总是倾向于避免使用fscanf
, importdata
, textscan
和类似的函数,因为它们可能很难处理,而且我认为它们的输出有时不容易操纵。 On the top of that, your file format looks very similar to the one that Matlab uses for displaying tables data... I think that this is nicenly pointing you to the right direction. 最重要的是,您的文件格式看起来与Matlab用于显示表格数据的格式非常相似...我认为这很好地为您指明了正确的方向。
I recommend you to use readtable , not only because of the aforementioned reasons but also because tables are very versatile in Matlab: 我建议您使用readtable ,这不仅是因为上述原因,还因为表在Matlab中用途非常广泛:
T = readtable('data.txt', ...
'Format', '%d %{dd/MM/yyyy}D %{HH:mm:ss.SSS}D %f %f %f %f %f %f', ...
'HeaderLines', 3)
The final output is: 最终输出为:
T =
9×9 table
Var1 Var2 Var3 Var4 Var5 Var6 Var7 Var8 Var9
____ __________ ____________ ____ _________ __________ ____ _____ ____
1 08/04/2018 09:56:52.790 20 19.99957 1999690178 55 10.02 0
2 08/04/2018 09:56:52.821 20 19.999602 1999690178 55 10.02 0
3 08/04/2018 09:56:52.852 20 19.99958 1999690178 55 10.02 0
4 08/04/2018 09:56:52.883 20 19.999623 1999690179 55 10.02 0
5 08/04/2018 09:56:52.915 20 19.999548 1999690179 55 10.02 0
6 08/04/2018 09:56:52.946 20 19.999602 1999690179 55 10.02 0
7 08/04/2018 09:56:52.993 20 19.999548 1999690179 55 10.02 0
8 08/04/2018 09:56:53.024 20 19.999602 1999690179 55 10.02 0
9 08/04/2018 09:56:53.055 20 19.999548 1999690179 55 10.02 0
PS = the %{...}T
format is probably due to a misleading way of handling format error messages from the part of Matlab, only %{...}D
is a valid datetime literal format until at least Matlab 2017A. PS = %{...}T
格式可能是由于从Matlab部门处理格式错误消息的方式具有误导性,只有%{...}D
是有效的日期时间文字格式,至少在Matlab 2017A之前有效。
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