fscanf question when ignoring header

7 次查看（过去 30 天）
m j
m j 2020-1-22
编辑： m j 2020-1-23
Hello,
I have a text file that im having issues with. Ive been able to read my others files but this one for some reason isnt working properly when trying to us fscanf.
The file has 5 headers then data of 2k samples:
SAMPLES: 2000
BITSPERSAMPLE: 32
CHANNELS: 1
SAMPLERATE: 96000
NORMALIZED: FALSE
50
45
30
etc...till 2k values
My code: for convience lets say this file is file # 4.
formatSpec = '%*s %f'; %ignore strings and keep integers
myCell = {}; %create cell to put data into after uigetfile
[file,path] = uigetfile('*.rnd','MultiSelect', 'on');
%creates file{1,X}
%open file # 4
pathname = file{1,4};
%use current pathname to open file
fileID = fopen(pathname,'r');
%read file with formatSpec set to ignore strings and read only numbers
myCell{1,1} = fscanf(fileID,formatSpec);
Pretty straightforward. And my code for opening all of my other files that have different headers/footers works fine,and they all use this same setup for formatSpec and fscanf. But when opening this file it just returns [2000,32,1,96000] in myCell.

请先登录，再回答此问题。

采纳的回答

Walter Roberson
Walter Roberson 2020-1-22
'%*s %f' does not mean to skip all strings and then look for a number. It means to skip one string and then look for a number. So it will skip 'NORMALIZED' and then try to read a number but will fail because FALSE is not a number.
  3 个评论
显示 1更早的评论
Walter Roberson
Walter Roberson 2020-1-23
In the case where the header starts with a known string and ends with a known string then you can use textscan CommentStyle parameter to skip the content.
Otherwise you need to know something more about the pattern that indicates end of header.
A lot of the time it can make sense to read everything in as a single string and then manipulate it with regexp or regexprep.
m j
m j 2020-1-23
编辑：m j 2020-1-23
Thanks, ill look into making it into and single string a manipulating it. I would just like the freedom to be able to open up multiple files that have different headers/footers and extract the data,regardless if I know how they are set up.

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Characters and Strings 的更多信息

标签

Community Treasure Hunt

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

Start Hunting!

Translated by