How to write a condition ?
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Hi, i have to write this condition in my code but i don't know how
moyenne <= '(-inf-6.95]'
1 个评论
Jan
2017-5-23
Are you aware that the notation, you have invented, is not clear or unique? What exactly does the smaller than operator do with a string? What exactly is (-inf-6.95] ?
Do you mean: Moyenne is > -Inf and small or equal -6.95?
回答（2 个）
Can't. Comparison operations always return logical 0 (false) where A or B have NaN elements.
Best you can do is test if result isfinite or not. See
doc isfinite % and friends for more information
ADDENDUM
OK, w/ the additional background try
Ayup...
moyenne<=-6.95
would give everything <= the breakpoint into that region, up to as large a negative value as can be represented. If the model can/does generate -Inf, that will have to be special-cased.
Jan's guess wasn't too far off, looks like
if sign(moyenne)*isinf(moyenne)==-1 | moyenne<=-6.95 % handle -Inf, too...
should do it. The first tests for -Inf and the other takes the case is finite but < than the breakpoint.
Do the similar thing on an unbounded upper bin as well.
Jan
2017-5-23
A bold guess:
isfinite(moyenne) & moyenne <= -6.95
9 个评论
afef
2017-5-23
Torsten
2017-5-23
???
dpb
2017-5-23
If it is finite it's smaller; the interval including -Inf is, well, "infinite", at least to the best representation can make digitally.
As noted above, you can't do anything with Inf computationally other that test whether a value is/is not finite. As soon as you bring Inf into any construct, the result is another Inf or perhaps NaN which is of no real benefit either.
Jan
2017-5-23
@afef: What does "smaller or equal to an interval" mean? What is the contents of "moyenne"? Is it a scalar number or two numbers to repesent an interval? You still let us guess, what you want to achieve. Please explain it in a clear sentence: "Moyenne has [e.g.] the value [...] and I want to get the result [true/false] it is [larger than -Inf and smaller than -6.95]".
I have suggested some code. Did you try it? Does it work? If not, what is the difference between the result and what you want?
dpb
2017-5-23
"moyenne is smaller or equal to the interval from minis infinite to 6.95"
Is this a cumulative distribution function or the like, mayhaps???
Tell us what the context is and maybe we can figure out something...as a standalone, it's likely what you've gotten is best can do...
afef
2017-5-24
dpb
2017-5-24
Then it's simply binning and everything <-6.95 goes to the first bin; you don't need to describe the lower limit at all.
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