This question is about making a simple bar (column) chart using ggplot2 in R. When I try to shift the x positions of the bars, everything falls apart. Here's what I've done: I have loaded up ggplot2 and have created the following data frame.
library(ggplot2)
df_SNR <-
structure(list(
SNR = c(-3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26),
count = c(16L, 27L, 174L, 448L, 1582L, 1715L, 1639L, 1304L,
853L, 778L, 612L, 473L, 374L, 275L, 210L, 168L, 140L, 101L,
101L, 85L, 82L, 61L, 63L, 44L, 41L, 36L, 26L, 23L, 20L, 60L
)),
row.names = c(NA, -30L), class = c("tbl_df", "tbl", "data.frame"))
I can make a decent bar chart with this data frame, as follows:
ggplot(df_SNR)+
aes(x = SNR, y = count)+
geom_col()
But I actually need to shift the x positions over by 0.5. So I do this:
ggplot(df_SNR)+
aes(x = SNR+0.5, y = count)+
geom_col()
The plot is wrecked.
First troubleshooting: adjust the x position by 1 instead of 0.5:
ggplot(df_SNR)+
aes(x = SNR+1, y = count)+
geom_col()
It works!
What about adjusting by 1.5?
ggplot(df_SNR)+
aes(x = SNR+1.5, y = count)+
geom_col()
Wrecked. it doesn't like non-integer x positions.
Is it failing because the x position is changed in the ggplot code? I tried to change the x position variable (SNR) in the actual data frame, so that it wouldn't require any adjustment in the code.
df_SNR2 <- df_SNR
df_SNR2$SNR <- df_SNR2$SNR + 0.5
ggplot(df_SNR2)+
aes(x = SNR, y = count)+
geom_col()
Still wrecked.
The code with the +0.5 adjustment worked before I updated R to 4.0.0. Is anyone having this problem? Does anyone know how to fix it? is it a bug?
Here's my session info:
R version 4.0.0 (2020-04-24)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)
Matrix products: default
locale:
[6] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[6] stats graphics grDevices utils datasets methods base
other attached packages:
[6] ggplot2_3.3.1
loaded via a namespace (and not attached):
[6] rstudioapi_0.11 magrittr_1.5 tidyselect_1.1.0 munsell_0.5.0 colorspace_1.4-1
[6] R6_2.4.1 rlang_0.4.6 fansi_0.4.1 dplyr_1.0.0 tools_4.0.0
[11] grid_4.0.0 gtable_0.3.0 cli_2.0.2 withr_2.2.0 ellipsis_0.3.1
[16] digest_0.6.25 assertthat_0.2.1 tibble_3.0.1 lifecycle_0.2.0 crayon_1.3.4
[21] purrr_0.3.4 farver_2.0.3 vctrs_0.3.0 glue_1.4.1 labeling_0.3
[26] compiler_4.0.0 pillar_1.4.4 generics_0.0.2 scales_1.1.1 pkgconfig_2.0.3