String parsing

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skyimager 2012-5-30

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input string s='Temp : 34, Altitude : 35, Pressure : 45' . I now want to store Temp, Alt and Pressure value in three different Strings. How to do the parsing in this case..??? Pls help.

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Answer 1

Geoff 2012-5-30

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It kinda depends on how flexible you need to be. Are the tags ever in a different order? Is the format EXACTLY as given? Are the numbers always integers?

Something as simple as this could work:

sscanf(s, 'Temp : %f, Altitude : %f, Pressure : %f')

[EDIT] Oh, sorry, you said "strings":

regexp(s, ':\s*(\d+),.*:\s*(\d+),.*:\s*(\d+)', 'tokens')

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skyimager 2012-5-30

Thanks alot Sir. The actual data format is tragya$567$67$678$789$tragya , the first set of no should be stored as pressure value then the next set as temperature and so on. The order never changes.

Also can u please explain me how to from regular expressions for regexp function ? I mean what does s* (\d+) mean..???

Geoff 2012-5-30

\s* matches 0 or more whitespace characters. \d+ matches 1 or more digits (note that if you want to accept non-integers or negative values, you can probably get away with using \w+ which matches 1 or more non-whitespace characters) . The parentheses means I want to specifically extract the stuff inside. Read the help for regexp, or find regular expression tutorials on the internet. These things are not just confined to MatLab.

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