Value associate to a parameter in a text
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So I have a text file similar to the following:
DELZZ 3301.23
KUTY 4.32 SERI -0.023
I want Matlab to read the file and return values associate to each parameter (DELZZ, KUTY,SERI,...) Any suggestion?
采纳的回答
data = fileread('mytextfile.txt');
val = regexp(data,'(?<=\s)(-?\d*\.?\d*)(?=\s|$)','match');
7 个评论
Jack
2018-7-9
- -? Matches a negative sign optionally.
- \d+ Matches digits.
- \. Matches a decimal point optionally.
- \d+ Matches more digits.
The output is:
val:
{'3301.23'} {'4.32'} {'-0.023'}
If you need to perform numerical calculations you need to convert the character vectors to doubles:
val = cellfun(@str2double,val);
Does that help you?
Paolo
2018-7-9
If you wanted the result for a specific case, i.e. KUTY01, you can use:
(?<=KUTY01\s)-?\d+\.?\d+
The first part of the regular expression (?<=KUTY01\s) is a positive lookbehind.
As you can see here, it checks backwards to see if pattern KUTY01, followed by whitespace, is found. If it is, it matches the sequence of digits, decimal point and digits as explained in the previous comment. As you can see, only 33.02 is now matched.
If you found the answer useful consider accepting it/voting :)
Jack
2018-7-9
Paolo
2018-7-9
That's right, you will need to use the greedy * quantifier rather than the + quantifier. Since you need to match those values too, use:
(?<=KUTY01\s)-?\d*\.?\d*
I'll update my answer.
Jack
2018-7-9
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