> -Original Message-
> From: Ian Willems [mailto:ian.will...@uz.kuleuven.ac.be]
> Sent: Tuesday, October 20, 2009 6:46 AM
> To: William Dunlap; r-help@r-project.org
> Subject: RE: [R] how to get rid of 2 for-loops and optimize runtime
>
> Hi William,
>
> Your
erent rows?
Thank u for your help
regards,
Ian
-Oorspronkelijk bericht-
Van: William Dunlap [mailto:wdun...@tibco.com]
Verzonden: maandag 19 oktober 2009 18:08
Aan: Ian Willems; r-help@r-project.org
Onderwerp: RE: [R] how to get rid of 2 for-loops and optimize runtime
> -Original
nk u for your time
Greetings,
Ian
-Oorspronkelijk bericht-
Van: joris meys [mailto:jorism...@gmail.com]
Verzonden: maandag 19 oktober 2009 16:12
Aan: Ian Willems
CC: r-help@r-project.org
Onderwerp: Re: [R] how to get rid of 2 for-loops and optimize runtime
Hi Ian,
first of all, take
> -Original Message-
> From: r-help-boun...@r-project.org
> [mailto:r-help-boun...@r-project.org] On Behalf Of Ian Willems
> Sent: Monday, October 19, 2009 6:50 AM
> To: 'r-help@r-project.org'
> Subject: [R] how to get rid of 2 for-loops and optimize runtim
Hi Ian,
first of all, take a look at the functions sapply, mapply, lapply,
tapply, ... : they are the more efficient way of implementing loops.
Second, could you elaborate a bit further on the data set : the amount
of the month ago, is that one value from another row, or the sum of
all values in
Short: get rid of the loops I use and optimize runtime
Dear all,
I want to calculate for each row the amount of the month ago. I use a matrix
with 2100 rows and 22 colums (which is still a very small matrix. nrows of
other matrixes can easily be more then 10)
Table before
Year month quart
6 matches
Mail list logo
