Problem with *txt File Format conversion using Matlab

Question

Dung Tran 2021-3-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/777142-problem-with-txt-file-format-conversion-using-matlab

评论： Dung Tran 2021-3-19

Hi everyone, I have a question.

I want to re-write a format *txt into another format *txt.

Here is an example (1):

12:20:30.12345 1111 1112 1113 1114 1115 1116 1117 1118 1119 2000

I want to convert it into (2):

12:20:30 1111 1112 1113 1114 1115 1116 1117 1118

How can I read the file (1) and then convert it into the format as (2) .

NOTE: 12:20:30.12345 mean the time with second detail. 12hr 20 mins and 30.12345 second. I want the second to be rounded, example : 30.4s will 30s and 30.6s is 31s

The file with 11 columns and row is about over 5000 lines

Thank you very much.

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Answer 1

ANKUR KUMAR 2021-3-18

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https://ww2.mathworks.cn/matlabcentral/answers/777142-problem-with-txt-file-format-conversion-using-matlab#answer_651932

编辑：ANKUR KUMAR 2021-3-18

在 MATLAB Online 中打开

sample_file.txt

I have used a sample file just like yours (attached). Hope it helps.

clc
clear
formatSpec = '%14s%5s%5s%5s%5s%5s%5s%5s%5s%5s%s%[^\n\r]';
fileID = fopen('sample_file.txt','r');
dataArray = textscan(fileID, formatSpec, 'Delimiter', '', 'WhiteSpace', '',  'ReturnOnError', false);
dataArray{1} = strtrim(dataArray{1});
raw = repmat({''},length(dataArray{1}),length(dataArray)-1);
for col=1:length(dataArray)-1
    raw(1:length(dataArray{col}),col) = dataArray{col};
end
for kk=1:size(raw,1)
    first_col=round(str2double(raw{kk}(7:end)),1)
    output{kk}=[num2str(first_col) raw(2:end)]
end
output_var=cat(1,output{:});
dlmcell('sample_ouput.txt',output_var)

You can get the dlmcell from file exchange.

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Answer 2

Cris LaPierre 2021-3-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/777142-problem-with-txt-file-format-conversion-using-matlab#answer_651947

在 MATLAB Online 中打开

rawData.txt

I would use readtable to load your text file. In newer releases, this will automatically read in the first column as a duration.

Use the hms function to extract the time components, and use round to round your seconds, assigning the result back into the table.

Once complete, use writetable to create a new text file.

d=readtable("rawData.txt","ReadVariableNames",false,"Delimiter"," ")
d = 1×11 table
         Var1          Var2    Var3    Var4    Var5    Var6    Var7    Var8    Var9    Var10    Var11
    _______________    ____    ____    ____    ____    ____    ____    ____    ____    _____    _____

    12:20:30.123450    1111    1112    1113    1114    1115    1116    1117    1118    1119     2000 
[h,m,s]=hms(d.Var1);
d.Var1 = duration(h,m,round(s))
d = 1×11 table
      Var1      Var2    Var3    Var4    Var5    Var6    Var7    Var8    Var9    Var10    Var11
    ________    ____    ____    ____    ____    ____    ____    ____    ____    _____    _____

    12:20:30    1111    1112    1113    1114    1115    1116    1117    1118    1119     2000 
writetable(d,"roundData.txt","WriteVariableNames",false,"Delimiter"," ")