Chapter 3: error executing ggsave to create final plot of results

[DanBuchan]

The following command in email_classify.R fails

ggsave(plot = class.plot,
filename = file.path("images", "03_final_classification.pdf"),
height = 10,
width = 10)

Throws this error:
Error in seq.default(min, max, by = by) :
invalid (to - from)/by in seq(.)

This is using R version 2.15.0 and OSX 10.7.3

[johnmyleswhite]

Does just calling print(class.plot) produce the same error?

[DanBuchan]

Yes, print(class.plot) returns the same error too.

I notice also that print(class.res) outputs complete different figures than are printed in the book. Although I assuming this is because the data in the data dir is different atm.

[johnmyleswhite]

Hmmm. This is quite hard to debug since the error message is so vague. I'll try the code again.

[drewconway]

What version of ggplot2 are you running?

[DanBuchan]

My installation reports that I'm using ggplot2_0.9.1

[hanfeisun]

I also has this bug..

Error in seq.default(min, max, by = by) :
invalid (to - from)/by in seq(.)

[hanfeisun]

I think that's caused by the "scale_x_log10" function, in the result of easyham2.class, there are some zero-value caused by precison

[pcp135]

I had the same problem and agree with hanfelsun that its related to the scale_x_log_10 functions. I was able to get around this by plotting the log of the values for pr.Spam & pr.Ham so avoiding the need to use these functions. ie try this code for your plot instead:

class.plot <- ggplot(class.df, aes(x = log(pr.Ham), log(pr.Spam))) +
geom_point(aes(shape = Type, alpha = 0.5)) +
stat_abline(yintercept = 0, slope = 1) +
scale_shape_manual(values = c("EASYHAM" = 1, "HARDHAM" = 2, "SPAM" = 3), name = "Email Type") +
scale_alpha(guide="none") +
xlab("log[Pr(HAM)]") +
ylab("log[Pr(SPAM)]") +
theme_bw() +
theme(axis.text.x = element_blank(), axis.text.y = element_blank())