[R-sig-Geo] Question on histograms from Raster and RasterVIS packages

[Thomas Adams]

Nuno,

Possibly having a reproducible example would help. I do all my spatial
analysis work starting from GRASS GIS and calling R from the GRASS prompt —
this works very well.

Tom

On Tue, Nov 18, 2014 at 11:35 AM, Greg Snow <538280 at gmail.com> wrote:

> Nuno,
>
> Does rasterVIS use base or grid graphics?
>
> The place I usually see the error that plot.new has not been called yet is
> when trying to use a base graphics function to augment a plot created using
> grid graphics.  I suspect that the plot created used grid graphics and that
> is why abline is not working for you.
>
> There is a 'grid.abline' function in the grid package, though it does not
> look like it would work easily for a vertical line, so you may need to dive
> into the details of using grid in more detail, probably using the
> grid.lines function.  There is also the gridBase package which helps grid
> and base graphics play nicely together, though it could be a bit of
> overkill for just adding a vertical line.
>
> On Tue, Nov 18, 2014 at 11:21 AM, Nuno Sá <nunocesardesa at gmail.com> wrote:
>
>> Hey Thomas!
>>
>> Yes thanks, I know it works for the normal hist function which uses 3% of
>> all data (mind I am talking about rasters) which I am not sure that is a
>> good enough sample, I leave that question in the air
>>
>> The problem is it does not work in rasterVIS (which does use all the
>> raster). The error it gives me is the following:
>>
>> > abline(v=m.rst,col="blue",lwd=2)
>> Error in int_abline(a = a, b = b, h = h, v = v, untf = untf, ...) :
>>   plot.new has not been called yet
>>
>> Regards!!
>> Thank you once again!
>> Nuno
>>
>> On 18 November 2014 18:04, Thomas Adams <tea3rd at gmail.com> wrote:
>>
>> > Nuno,
>> >
>> > This works for me:
>> >
>> > > require(stats)
>> > > set.seed(14)
>> > > x <- rchisq(100, df = 4)
>> > >
>> > >
>> > > hist(x)
>> > > meanx<-mean(x)
>> > > meanx
>> > [1] 3.734162
>> > > abline(v=meanx, col="red")
>> >
>> > Cheers!
>> > Tom
>> >
>> > On Tue, Nov 18, 2014 at 10:56 AM, Nuno Sá <nunocesardesa at gmail.com>
>> wrote:
>> >
>> >> Hello!
>> >>
>> >> My aim is to add a "Median" or a "Mean" line to an histogram plot in R.
>> >>
>> >> The problem is the following:
>> >>
>> >> The "hist" function from the raster package uses a maximum of 100 000
>> >> values for generating the histogram but allows me to edit the plot, so
>> I
>> >> can easily add a line within the plot using abline.
>> >>
>> >> The "histogram" function in rasterVIS uses all my dataset but does not
>> >> allow editing of the plot area, so I cannot use the abline function to
>> add
>> >> this line (or I do not know how to do it).
>> >>
>> >> If you have an alternative or a solution to work around this, I am all
>> >> hears
>> >>
>> >> Thank you for any help in advance!
>> >> Ciao!
>> >> --
>> >>
>> >> Nuno César de Sá
>> >> +351 91 961 90 37
>> >>
>> >>         [[alternative HTML version deleted]]
>> >>
>> >> _______________________________________________
>> >> R-sig-Geo mailing list
>> >> R-sig-Geo at r-project.org
>> >> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>> >>
>> >
>> >
>> >
>> >
>> >
>>
>>
>> --
>>
>> Nuno César de Sá
>> +351 91 961 90 37
>>
>>         [[alternative HTML version deleted]]
>>
>> _______________________________________________
>> R-sig-Geo mailing list
>> R-sig-Geo at r-project.org
>> https://stat.ethz.ch/mailman/listinfo/r-sig-geo
>>
>
>
>
> --
> Gregory (Greg) L. Snow Ph.D.
> 538280 at gmail.com
>

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