On 29/01/2017 12:05 AM, Jim Lemon wrote:
Hi Richard,
I think there may be something amiss in the plot.table function. As
you note, changing the class of fr to array produces a more sensible
plot, as does Bert's "as.vector". Yet inside plot.table we find:
plot(x0, unclass(x), ...
and that should produce an array:
class(unclass(fr))
[1] "array"
The plot.table function looks like it should produce the plot you
want, but it doesn't. I think (therefore I am probably wrong) that a
1D table is handled in the same way as multiD table rather than being
squeezed into a vector.
I think the issue is that Axis() is called without removing the class.
Axis.table sets ticks based on the names of the table.
Duncan Murdoch
Jim
On Sun, Jan 29, 2017 at 11:19 AM, Bert Gunter <bgunter.4...@gmail.com> wrote:
Rich:
Simpler: Just lose the "table" class.
plot(as.numeric(names(fr)), as.vector(fr), type="h",
xlab="Determinant", ylab="Frequency")
However, I'm no less puzzled by the "strange" behavior than you.
In addition, it's probably worth noting that xyplot in lattice (and no
doubt ggplot,too) does not have this problem (as I'm sure you know):
xyplot(fr ~ as.numeric(names(fr)), type="h",
xlab="Determinant", ylab="Frequency")
Cheers,
Bert
Bert Gunter
"The trouble with having an open mind is that people keep coming along
and sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
On Sat, Jan 28, 2017 at 3:03 PM, Richard M. Heiberger <r...@temple.edu> wrote:
## This example is from R-intro.pdf page 21 (R-3.3.2)
d <- outer(0:9, 0:9)
fr <- table(outer(d, d, "-"))
plot(as.numeric(names(fr)), fr, type="h",
xlab="Determinant", ylab="Frequency")
## The y-axis tick marks are at c(-21,24,65).
## This seems to be because class(fr) == "table"
## Switching the class to array gives the more appropriate
## y-axis ticks at seq(0,500,100) .
fr.array <- fr
class(fr.array) <- "array"
plot(as.numeric(names(fr)), fr.array, type="h",
xlab="Determinant", ylab="Frequency")
## I have a question and a recommendation.
## Question:
## Why are the y-axis ticks for the table defaulted to c(-21,24,65).
##
## Recommendation:
## Changed the example on page 21 to show the ticks at seq(0,500,100)?
## Rich
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