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My graph has a data-point-sized gap before and after the trend line. I already factored the data to include only the days that I want- the days are put in as character data to prevent it from using days on the x axis that I don't want, as I'm using only Days 0, 1, 3, 7, 10 (not consistent spacing). see photo.

plot <- ggplot(N2O_Methylocella[!is.na(N2O_Methylocella$Day), ], aes(x = Day, y = N2O, colour = Amendment)) + 
  geom_point(size = 1, alpha = 1) +
  geom_smooth(aes(group="Amendment"), method = lm, level = 0.95) +
  facet_grid("Amendment", switch = "both") +
  xlab("Day") +
  ylab(expression(phantom()*"Total "*N[2]*"O Production (%)")) +
  ggtitle(my_title) +
  scale_fill_npg(alpha = 0.8) +
  guides(colour = FALSE, size = FALSE) +
  theme(text=element_text(size=24), panel.grid.minor = element_blank())

results in the photo above.

Trying to add scale_x_discrete(c("1", "10")) results in no change, and expand(c(0,0)) as recommended for scale_x_continuous doesn't work for discrete.

I just want to cut out the weird gaps.

stefan
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hank00000
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1 Answers1

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You may add the following to ggplot (change to manual/ discrete from continuous when needed):

scale_x_discrete(expand = c(0, 0))

scale_y_discrete(expand = c(0, 0))
William Wong
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