[R] Plot only a portion of a record

[Jim Lemon]

On 01/14/2014 11:39 AM, 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?
>
Hi Janet,
I suppose you could just pass the whole data frame and use:

xlim=as.Date(c("1976-01-01","1976-31-12"),"%Y-%m-%d")

assuming that you are plotting modQ against a Date object.

Jim