| Most significant digit and formatting floating point output [message #81095] |
Tue, 07 August 2012 06:33 |
Helder Marchetto
Messages: 520
Registered: November 2011
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Senior Member |
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Dear all,
well, I'm tangled up with something quite stupid, but I don't want to reinvent the wheel (for the 10th time today...).
Here are two versions of the same question:
1) Short version: given a number such as 0.003456789 how do I get the most significant digit position? I need this number to produce formatted output that would convert the number to simply 0.003. In general I can figure this out with some IFs and stuff like that, but I'm hoping there is a more "elegant" way for this.
2) Long version: I'm analyzing some images and I get results with errors. These numbers are floating point and I would like to format the output so that it looks something like this: 'My results are (0.123 +/- 0.003) units' and the source data is:
Result = 0.123456789
Error = 0.003456789
The point is that I need to find the first non-zero element in Error. Then I would use this number in the FORMAT parameter like this: MyFormat = '(f0'+STRTRIM(FirstNonZeroElement+2,2)+'.'+STRTRIM(FirstNonZ eroElement,2)+')'
and use "MyFormat" as formatting for the string conversion of both.
(in the above example FirstNonZeroElement should be 3 and MyFormat would be '(f05.3)'.
Thanks in advance for any help.
Cheers,
Helder
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