How to add text from name of .txt-file into string in a cell?

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Linus Dock 2016-10-6

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https://ww2.mathworks.cn/matlabcentral/answers/306074-how-to-add-text-from-name-of-txt-file-into-string-in-a-cell

评论： Linus Dock 2016-10-7

Hi! I wonder if it is possible to add the name of a textfile for example: 200807.txt into strings in a cell that looks like this:

 'METAR ESDF 010020Z AUTO 31003KT 230V350 9999NDV NCD 12/08 Q1017'
 'METAR ESDF 010050Z AUTO 24003KT 230V320 9999NDV NCD 12/08 Q1017'
 'METAR ESDF 010120Z AUTO 25003KT 230V350 9999NDV NCD 11/08 Q1017'

The strings exists in a .txt-file containing 45000 rows approximately that is imported with fread(). The only information about the year and month of the data is from the filename itself. The problem is that I would like to add the name of the file which contains the information about year and month to the part '010020Z'. That would provide a unique date and time to my strings that I could later use with datevec or datenum. Is there a way of doing this with matlab?

Thankful of your help!

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Jim Hokanson 2016-10-6

It would be helpful to provide an example of what your output should look like.

Linus Dock 2016-10-6

It should look something like this:

'METAR ESDF 200807010120Z AUTO 25003KT 230V350 9999NDV NCD 11/08 Q1017'

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Answer 1

Guillaume 2016-10-6

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https://ww2.mathworks.cn/matlabcentral/answers/306074-how-to-add-text-from-name-of-txt-file-into-string-in-a-cell#answer_237750

在 MATLAB Online 中打开

Use regexprep:

regexprep(yourcellarray, 'd{6}Z', sprintf('%s$0', stringtoadd))

The above regular expression matches exactly 6 digits followed by Z and prepend that section with whichever string you want to add.

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Linus Dock 2016-10-7

在 MATLAB Online 中打开

Thank you! This is how it worked out.

flygplatsmetarYMDHM=cell(1,length(txtFiles))
filenamestr={txtFiles.name};
YYYYMM = regexprep(filenamestr, '.txt','')
for n=1:length(txtFiles)
    flygplatsYYYYMM=Utcell{n};
    yearmonth = YYYYMM{n}
    flygplatsmetarYMDHM{n}=regexprep(flygplatsYYYYMM, '\d{6}Z', sprintf('%s$0', yearmonth))
end