Reading in text file using textscan.

Question

Andrew Czeizler 2019-3-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/448941-reading-in-text-file-using-textscan

评论： Andrew Czeizler 2019-3-11

采纳的回答： Stephen23

testdata1.txt

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Hi All, I need to read a text file into four row vectors named bottleID, date, ph and pressure using textscan.

The file has the following format -

I have made an attempt but I am finding the function textscan quite difficult to use.

My attempt is below -

fileID = fopen('hots_data.txt','r');
format_string = '%n %[{dd-MMM-yyyy}D]%q %d %d';
C = textscan(fileID, format_string, 'delimiter', ' ', 'whitespace', ' ');
fclose(fileID);

Any help would be very much appreciated.

Many thanks,

Best,

Andrew

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Andrew Czeizler 2019-3-8

I have uploaded the file. Tried a loop technique with no success ......

Totally lost on this one.

Best,

Andrew

Andrew Czeizler 2019-3-10

编辑：Andrew Czeizler 2019-3-10

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Hi All,

I was able to get textscan to work, but I cant read it into rows?

Is there a method that I am missing?

Best.

Andrew

fileID = fopen('testdata1.txt','r');
C = textscan(fileID, '%d %{dd-MMM-yyyy}D %f %f', 'Delimiter', ' ');
fclose(fileID);

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Answer 1

Stephen23 2019-3-10

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/448941-reading-in-text-file-using-textscan#answer_364671

编辑：Stephen23 2019-3-11

在 MATLAB Online 中打开

textscan imports file data into one cell array, the contents of which are one or more arrays (numeric, cell, datetime, etc), where their number of rows depends on the rows imported from the file and their columns depends on the format specifier and options that you used.

textscan does not import into separate variables, or transpose imported data.

"I need to read a text file into four row vectors named bottleID, date, ph and pressure using textscan."

[fid,msg] = fopen('testdata1.txt','rt');
assert(fid>=3,msg)
C = textscan(fid, '%d%{dd-MMM-yyyy}D%f%f', 'Delimiter',' ');
fclose(fid);
bottleID = C{1}.';
date     = C{2}.';
ph       = C{3}.';
pressure = C{4}.';