[rrd-users] Re: Clipping data with sequences of IFs in a CDEF. Can it be done ?

[H. D. Lee]

On 2002.10.15_22:59:22_+0000, Stanley Hopcroft wrote:
> 
> Dear Ladies and Gentlemen,
> 

Hi Stanley,

> I am writing to say that I'd hoped to clip data before graphing it with
> something like
> 
> CDEF:clipped=x,UpperBound,GT,UpperBound,x,IF,LowerBound,LT,LowerBound,x,IF
> 
> (the intent is that clipped is x:  LowerBound <= x <= UpperBound. I
> thought the CDEF would evaluate to
> min(x,UpperBound),LowerBound,LT,LowerBound,x,IF. Perhaps this is what I 
> should have done in the first place.)
> 

You might want something like:

CDEF:clipped=x,LowerBound,LE,LowerBound,x,UpperBound,LE,x,UpperBound,IF,IF

I haven't tested it yet, CMIIW. Notice that LE was used instead of LT.

> The pair of CDEFs
> 
> CDEF:cliptop=x,UpperBound,GT,UpperBound,x,IF
> CDEF:clipped=cupper,LowerBound,LT,LowerBound,cliptop,IF
> 
> work quite happily.

May be you mean:

CDEF:cliptop=x,UpperBound,GE,UpperBound,x,IF
CDEF:clipped=cliptop,LowerBound,LE,LowerBound,cliptop,IF

It improves the readability, IMHO.

> Yours sincerely.
> 
> -- 
> ------------------------------------------------------------------------
> Stanley Hopcroft
> ------------------------------------------------------------------------
> 
> '...No man is an island, entire of itself; every man is a piece of the
> continent, a part of the main. If a clod be washed away by the sea,
> Europe is the less, as well as if a promontory were, as well as if a
> manor of thy friend's or of thine own were. Any man's death diminishes
> me, because I am involved in mankind; and therefore never send to know
> for whom the bell tolls; it tolls for thee...'
> 
> from Meditation 17, J Donne.
> 

-- 
H. D. Lee

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