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error in plot(table(c('a','a')))

3 messages · Ludo Pagie, R. Michael Weylandt, Rui Barradas

Original
Ludo Pagie
# 
Hi all,

there appears to be something strange with the plotting of tables of 1
dimension; if I attempt to make a plot of a table of characters with only
1 value I get an error (Error in xy.coords(x, y, xlabel, ylabel, log) :
  'x' and 'y' lengths differ). With more than one value I don't get
errors, neither with integers (even if only 1 value):

tbl.char1 <- table(c('a','a'))
tbl.char2 <- table(c('a','a','b'))
tbl.int1 <- table(c(1,1))

# error:
plot(tbl.char1)

# no errors:
plot(tbl.char2)
plot(tbl.int1)


sessionInfo()


R version 2.14.0 (2011-10-31)
Platform: i686-pc-linux-gnu (32-bit)

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
 [5] LC_MONETARY=en_US.UTF-8    LC_MESSAGES=en_US.UTF-8
 [7] LC_PAPER=C                 LC_NAME=C
 [9] LC_ADDRESS=C               LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C

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



Thanks, Ludo
R. Michael Weylandt
#
On Mon, Nov 26, 2012 at 2:41 PM, Ludo Pagie <l.pagie at nki.nl> wrote:
Confirmed in current R-devel. It seems to arise from plot.table's use
of seq.int(x) when the dimnames of the table are not integers. I'm not
sure if this shouldn't be seq_along(x) instead, but I'm not sure I
totally follow the internal logic, so perhaps someone can offer second
opinion?

Michael
Rui Barradas
# 
Hello,

Also gives an error in R 2.15.2 on Windows 7. I'd change "when the 
dimnames of the table are not integers " to not numeric as that's what 
the code for plot.table tests. And it seems to come from seq.int, since 
with table value of 2, seq.int produces a vector of length 2 but the 
table length is 1:

 > seq.int(tbl.char1)
[1] 1 2
 > seq_along(tbl.char1)
[1] 1


So the plot command will have 2 values for the x axis but just one for 
the y axis.
seq_along seems to solve the matter.

Hope this helps,

Rui Barradas
Em 26-11-2012 21:39, R. Michael Weylandt escreveu: