[R] help: selection of data

[stephen sefick]

#is this what you want?
x <- c(-10, -5, 0, 5, 10, 15, 20)
y <- c(10, 10, 10, -5, -6, -7, 10)
data <- data.frame(x, y)
subset(data, x>0 & y==min(y))

On Sat, Oct 25, 2008 at 12:33 PM, Martin Ballaschk <qcumba at web.de> wrote:
> Hi,
>
> I'm not very experienced with R and struggle with data selection from a long
> matrix with two columns.
>
> I want to cut out the data between x > 0 and min(y).
>
>> x <- c(-10, -5, 0, 5, 10, 15, 20)
>> y <- c(10, 10, 10, -5, -6, -7, 10)
>> data <- as.matrix( cbind(x, y) )
>
>> data
>       x  y
> [1,] -10 10
> [2,]  -5 10
> [3,]   0 10 _
> [4,]   5 -5  |-- data interval
> [5,]  10 -6 _|   to be selected
> [6,]  15 -7
> [7,]  20 10
>
>
> I need that to select the interval between a time 0 and a peak that is the
> minimum here to fit that interval via nls() later.
>
> Can anybody help? I would be very thankful for general hints how to select
> data with the help of conditions.
>
> Cheers
> Martin
>
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-- 
Stephen Sefick
Research Scientist
Southeastern Natural Sciences Academy

Let's not spend our time and resources thinking about things that are
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annoying little problems of being mammals.

								-K. Mullis