[R] add segments from other data ggplot

[PIKAL Petr]

Dear all

I want to put arrows from other data to ggplot and get strange behaviour.

The 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")))

results to following error

Error in eval(expr, envir, enclos) : object 'mereni' not found

The working code (with bad legend)

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, colour="black"), arrow = arrow(length = unit(1,"cm")))

I know how to improve legend manually but I wonder why the first code results in error, why in the second code black colour is ignored but results in no error.

Data:

ram.ag <- structure(list(vzorek = c("1.5 1:00", "1.5 11:00", "1.6 19:00",
"12.5 21:00", "16.5 17:00", "17.4 19:00", "17.5 9:00", "18.5 15:00",
"18.5 17:00", "27.5 7:00", "30.4 13:00", "4.6 17:00", "8.4 5:00",
"1.5 1:00", "1.5 11:00", "1.6 19:00", "12.5 21:00", "16.5 17:00",
"17.4 19:00", "17.5 9:00", "18.5 15:00", "18.5 17:00", "27.5 7:00",
"30.4 13:00", "4.6 17:00", "8.4 5:00"), mereni = structure(c(1L,
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 2L, 2L, 2L, 2L,
2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L), .Label = c("nove", "puvodni"
), class = "factor"), Raman = c(98.2333333333333, 98.5, 99.9,
97.5333333333333, 92.375, 97.9666666666667, 98.225, 95.3, 90.5,
99.6, 97.45, 92.1, 98.45, 95.1, 99.1, 99.9, 97.9, 95.7, 97.6,
94.8, 97, 93.1, 99.3, 91.5, 88.9, 99.2), XRD = c(99.4, 99.4666666666667,
99.88, 99.6666666666667, 96.025, 99.5666666666667, 99.5, 98.75,
96.3333333333333, 99.725, 98.75, 97.425, 99.55, 98.9, 98.9, 99.3,
98.9, 94.7, 98.9, 98.9, 96.2, 96.2, 98.9, 97.4, 94.7, 97.4)), .Names = c("vzorek",
"mereni", "Raman", "XRD"), row.names = c(NA, -26L), class = "data.frame")

dat <- structure(list(Ramanpuv = c(95.1, 99.1, 99.9, 97.9, 95.7, 97.6,
94.8, 97, 93.1, 99.3, 91.5, 88.9, 99.2), XRDpuv = c(98.9, 98.9,
99.3, 98.9, 94.7, 98.9, 98.9, 96.2, 96.2, 98.9, 97.4, 94.7, 97.4
), Ramannov = c(98.2333333333333, 98.5, 99.9, 97.5333333333333,
92.375, 97.9666666666667, 98.225, 95.3, 90.5, 99.6, 97.45, 92.1,
98.45), XRDnov = c(99.4, 99.4666666666667, 99.88, 99.6666666666667,
96.025, 99.5666666666667, 99.5, 98.75, 96.3333333333333, 99.725,
98.75, 97.425, 99.55)), .Names = c("Ramanpuv", "XRDpuv", "Ramannov",
"XRDnov"), row.names = 14:26, class = "data.frame")

sessionInfo()
R Under development (unstable) (2016-03-15 r70334)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 10 x64 (build 10586)

locale:
[1] LC_COLLATE=Czech_Czech Republic.1250  LC_CTYPE=Czech_Czech Republic.1250
[3] LC_MONETARY=Czech_Czech Republic.1250 LC_NUMERIC=C
[5] LC_TIME=Czech_Czech Republic.1250

attached base packages:
[1] stats     datasets  utils     grDevices graphics  methods   base

other attached packages:
[1] devEMF_2.0      ggplot2_2.1.0   lattice_0.20-33 fun_0.1

loaded via a namespace (and not attached):
 [1] labeling_0.3     colorspace_1.2-6 scales_0.4.0     plyr_1.8.3
 [5] tools_3.3.0      gtable_0.2.0     Rcpp_0.12.4      nlme_3.1-126
 [9] grid_3.3.0       digest_0.6.9     munsell_0.4.3
>

Maybe it is version specific so I will try to check but I do not want to reinstall everything just now without a reason.

Best regards
Petr Pikal
Precheza a.s
724008364

"Kdo vždy myslí, že se učí,
bude vlasti chlouba.
Kdo si myslí, že dost umí,
začíná být trouba."
Karel Havlíček Borovský


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