I meant - even if 0 = 0.004
D.
On Tue, Mar 30, 2010 at 12:47 PM, Dimitri Liakhovitski wrote:
> Dear Charles, thank you so much!
> On my example data frame you code takes 0 sec and mine - 0.05 sec - a
> huge difference even if 0 = 0.04 sec.
> Dimitri
>
>
> On Tue, Mar 30, 2010 at 12:30 PM, Dimitri
Dear Charles, thank you so much!
On my example data frame you code takes 0 sec and mine - 0.05 sec - a
huge difference even if 0 = 0.04 sec.
Dimitri
On Tue, Mar 30, 2010 at 12:30 PM, Dimitri Liakhovitski wrote:
> Thanks a lot, Charles - I'll try your approach.
> Yes - don't worry about dividing
Thanks a lot, Charles - I'll try your approach.
Yes - don't worry about dividing by negative means - in real data all
values are positive.
Dimitri
On Tue, Mar 30, 2010 at 12:24 PM, Charles C. Berry wrote:
> On Tue, 30 Mar 2010, Dimitri Liakhovitski wrote:
>
>> Dear R-ers,
>>
>> I have a large da
I posted a similar problem last week (but with an uninformative subject
header) See if this
http://n4.nabble.com/a-vectorized-solution-to-some-simple-dataframe-math-td1692810.html#a1710410
this helps.
--
View this message in context:
http://n4.nabble.com/Code-is-too-slow-mean-centering-variab
On Tue, 30 Mar 2010, Dimitri Liakhovitski wrote:
Dear R-ers,
I have a large data frame (several thousands of rows and about 2.5
thousand columns). One variable ("group") is a grouping variable with
over 30 levels. And I have a lot of NAs.
For each variable, I need to divide each value by varia
I wrote a different code - but it takes twice as long as my original code. :(
However, I thought I should share it as well - because the second part
of the code is fast - it's the first part that's slow. Maybe there is
a way to fix the first part...
Thank you!
group.var<-"group"
subgroups<-levels
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