[R] add segments from other data ggplot

[PIKAL Petr]

Thanks Ron.

Your explanation is clear, at least to me. I did not use the approach of start with plain ggplot call following some geom calls before.

However I must say I finally turned back to standard graphics which seems to me easier in this case and I can easily add other values without many problems. But I keep your solution for future.

Thanks again

Petr

> -----Original Message-----
> From: Crump, Ron [mailto:R.E.Crump at warwick.ac.uk]
> Sent: Monday, August 15, 2016 12:57 PM
> To: PIKAL Petr <petr.pikal at precheza.cz>
> Cc: r-help at r-project.org
> Subject: Re: [R] add segments from other data ggplot
>
> Dear Petr,
>
> In your code:
>
> p<-ggplot(ram.ag, aes(Raman, XRD, colour=mereni))
> p+geom_point(size=5)+geom_segment(data=dat, aes(x=Ramanpuv,
> y=XRDpuv,xend=Ramannov,
> yend=XRDnov), arrow = arrow(length = unit(1,"cm")))
>
> you have set mereni to control the colour aesthetic in the call to ggplot.
> This will be used in all subsequent calls to geoms, unless you make a local call
> to aes to override it. So both ram.ag and dat would require mereni columns
> for this to work.
>
> In the second piece of code you use a call to aes to override colour in the call
> to geom_segment, which gets you past the error, but do not set it to a
> variable in dat. You shouldn't set an aesthetic to a constant ("black"), use
> colour="black" outside of the aes() if you want it set (although it is redundant
> in this case, black being the default).
>
> If you are using multiple data sources it is probably safer to refer to them and
> set the appropriate aesthetics where they are used, e.g.
>
> p <-
> ggplot()+geom_point(data=ram.ag,aes(x=Raman,y=XRD,colour=mereni))+
> geom_segment(data=dat,aes(x=Ramanpuv,y=XRDpuv,xend=Ramannov,yen
> d=XRDnov),ar
> row=arrow(length=unit(1,"cm")))
>
>
> Hope this helps, I apologise if it isn't very clear.
>
> Regards,
> Ron.


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