AW: [R] x[x > y] and more conditions

[Christian Schulz]

Thanks for the hint's, and sorry
for my confusing, which come from my
sql activity which need &&  or AND.

regards,christian




-----Ursprungliche Nachricht-----
Von: Uwe Ligges [mailto:ligges at statistik.uni-dortmund.de]
Gesendet: Dienstag, 18. November 2003 11:29
An: Christian Schulz
Cc: R-Help
Betreff: Re: [R] x[x > y] and more conditions




On Tue, 18 Nov 2003, Christian Schulz wrote:

> ...and  i'm getting all cases which
> are true for above condition and get the information
> how many cases match, too. The vector's are in a attached data.frame.
>
> FAKTOR30[FAKTOR30 > 0.234]
> ...................
> [102193] 0.352 0.352 0.288 0.354 0.352 0.358 0.352 0.352 0.311 0.370 0.352
> 0.336
> [102205] 0.352 0.274 0.352 0.405 0.354 0.352 0.352 0.352 0.352 0.352 0.352
> 0.340
> [102217] 0.352 0.352
>
>
> But if i use more than one "index" term
> UMSATZ30[UMSATZ30 > 10] && FAKTOR30[FAKTOR30 = 0.234]
>
> [1] NA

See ?"&&" which tells you to use "&" instead os "&&" for vectorized
logical operations like this one.

Using "&&" only evaluates the first elements of those logical vectors, so
there seems to be an NA in UMSATZ30[1] or FAKTOR30[1]....

Uwe Ligges


> I get  true, false  or NA  and the latter i think this mean there isn't
any
> case with this condition!?
> But, how can i check cases with more than one condition like the single
> example, i trial some but getting no success?
>
> Many thanks for help,
> christian
>
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