plotting many lines - simplification

[Troels Ring]

Hi friends - I managed to simplify my question very much: I have a plot which works just fine, MPH and fpH each 76, predicts is a data.frame length 1000 of x and y

pp <- ggplot(FH0,aes(x=MPH,y= fpH))+geom_line(linetype=1,size=3,colour="blue")+

ylab("Fitted pH")+xlab("Measured pH")+xlim(c(6.9,7.7)) +ylim(c(6.9,7.7))

ppp <- pp + theme_bw()+ geom_line(data=predicts,size=3,col="red") 

ppp

and then I have the desire to add a line specified in the data.frame slines

> slines

       x        y

1  7.220 7.349371

2  7.290 7.413105

3  7.290 7.413105

4  7.300 7.422209

5  7.315 7.435867

6  7.320 7.440419

7  7.400 7.513257

8  7.410 7.522362

9  7.430 7.540571

10 7.440 7.549676

when I do naively

ppp + geom_line(data=slines,size=0.1)

I get the message

error: Aesthetics must either be length one, or the same length as the dataProblems:fpH - what goes wrong here?

[Doug Mitarotonda]

It would be easier to help if you had a fully working example, but my guess is that you would need to do `ppp + geom_line(aes(x = x, y = y), data = slines, size = 0.1)` because you are no longer using the “default” aesthetics you put in the ggplot call.

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[Troels Ring]

I'm sorry, but the start is complicated, so I thought it might work to translate the problem to the simpler, i.e. having one plot which is as wanted - and then just adding this simple line as specified with slines - and your suggestion did just that - thanks a lot!!!
Troels

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