How to select a specific line from text file

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Ebtesam Farid
Ebtesam Farid 2020-11-21
评论： Ameer Hamza 2020-11-21
please, I have a text file of Radiosonde data, and I want to select a specific value from the first coulmn of the data.
I tried textscan function, but by using specific number of the header, it removes all the wanted headerlines and still give me all the rest of data.
this is a sample of my data, I want to select the first temperature record (here is -34.9) only from the whole text.
<HTML>
<TITLE>University of Wyoming - Radiosonde Data</TITLE>
<BODY BGCOLOR="white">
<H2>71081 YUX Hall Beach Observations at 12Z 13 Dec 2016</H2>
<PRE>
-----------------------------------------------------------------------------
PRES HGHT TEMP DWPT RELH MIXR DRCT SKNT THTA THTE THTV
hPa m C C % g/kg deg knot K K K
-----------------------------------------------------------------------------
1008.0 6 -31.7 -34.9 73 0.20 300 8 240.9 241.5 240.9
1000.0 61 -28.3 -31.4 75 0.28 310 16 244.8 245.6 244.9
995.0 97 -25.7 -29.5 70 0.34 314 16 247.8 248.8 247.9
967.0 305 -22.6 -29.8 52 0.34 340 16 253.0 253.9 253.0
961.0 350 -21.9 -29.9 48 0.34 336 15 254.1 255.1 254.2
927.6 610 -21.3 -31.2 41 0.31 315 12 257.3 258.2 257.3
925.0 631 -21.3 -31.3 40 0.30 295 11 257.5 258.4 257.6
901.0 825 -21.9 -29.9 48 0.36 312 10 258.9 259.9 258.9
any advice, please.
Thanks

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Ameer Hamza
Ameer Hamza 2020-11-21
If the file have fixed number of header lines, then try this
f = fopen('data.txt');
data = textscan(f, '%f', 'HeaderLines', 9);
fclose(f);
val = data{1}(3)

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