[R] Competing with SPSS and SAS: improving code that loops throughrows (data manipulation)

Sharpie chuck at sharpsteen.net
Sat Mar 27 22:50:36 CET 2010



hadley wickham wrote:
> 
>>  exp1^(a[case] * l * 10)
>>
>> would be better written out of the loop as
>>
>>  b <- exp1^(a * l * 10)
> 
> And even better as
> 
> b <- exp(a * l * 10)
> 
> Hadley
> 

Aye, exp() functions tend to be heavily optimized compared to general
functions such as `^` even if e is used as the base of the exponent.

-Charlie

-----
Charlie Sharpsteen
Undergraduate-- Environmental Resources Engineering
Humboldt State University
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