how to select columns of data (.dat)

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Soni huu 2012-6-25

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https://ww2.mathworks.cn/matlabcentral/answers/42024-how-to-select-columns-of-data-dat

i have data in 732 file (.dat ) n this sample my data..

05:00      .000 065.501 01** 4864 0086 0074 +19 
06:00       .000 065.501 01** 4862 0095 0074 +19
07:00 R- .026 065.501 01** 4862 0105 0074 +19
08:00 R- .180 065.504 01** 4864 0105 0074 +19

now i want to plot column 1 (time) with (column 3) divide 60 (rain) ..

1. how i can do that, because i think sometimes matlab read my data just have 8 column (when no rain (R-)). n sometimes matlab read 9 column.

when no rain R- replace with 2 space

2. how i can read all file.

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per isakson 2012-6-25

A loop, "fgetl Read line from file, removing newline characters", and test for "R-" is one possibility.

Soni huu 2012-6-26

write the scrip please.. i don know what do u mind..

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采纳的回答

Walter Roberson 2012-6-26

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https://ww2.mathworks.cn/matlabcentral/answers/42024-how-to-select-columns-of-data-dat#answer_51778

You can use textscan(), and at the place where you might have the R- or might not, use %2c as the format. %c does not skip blanks. (Experiment: there is a chance you might need to use %*c%2c instead, to eat the space between fields.)

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Soni huu 2012-6-27

please... help me..

Soni huu 2012-6-28

编辑：Soni huu 2012-6-28

i read this to delimited the data, but the data just show in 1 culoumn..

fid = fopen('09-25-2010.dat','r'); InputText=textscan(fid,'%8c%*c%2c%*c%4c%*c%7c%*c%4c%*c%4c%*c%4c%*c%3c'); Intro=InputText{1}; disp(Intro);

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