[R] Plot only a portion of a record

[David Winsemius]

On Jan 13, 2014, at 4:39 PM, Janet Choate wrote:

> Hi R community,
> i have a data frame of streamflow for 23 years, i.e.
> 
>        date year month day   wy  yd wyd      modQ
> 1 1965-10-01 1965    10   1 1966 274   1 0.3341630
> 2 1965-10-02 1965    10   2 1966 275   2 0.3223247
> 3 1965-10-03 1965    10   3 1966 276   3 0.3109057
> 
> i only want to plot 1 of the years, along with the date.
> i can accomplish this with:
> 
> plot(mod.sage$date[mod.sage$wy==1976],mod.sage$modQ[mod.sage$wy==1976],
> type="l")
> 
> however, this is a bit long and clunky. is there a way to plot just a
> portion of the full data record without creating a whole new object with
> subset?
?subset
?with

with( subset( mod.sage, wy==1976), plot(date, $modQ, type="l") )

I didn't leave a new object in the global environment, although I did create a temporary subset-object.

--

David Winsemius
Alameda, CA, USA