Warn When Print Runs Out of Screen Room

[brodieG]

Scan for:

 [ reached getOption("max.print") -- omitted 900001 entries ]

at end of inputs.

[chambm]

Is there a way to avoid the truncation (output the full diff), other than the obvious one of changing max.print?

edit: Actually it seems even changing max.print before calling diffPrint() doesn't prevent the truncation. Why is that?

[brodieG]

If you're diffing character vectors (which you seem to be based on your prior comments), and you're not married to seeing them displayed the way R prints them (i.e.: [1] "a" "b" "c" etc.), then you can just use diffChr. That should be faster too.

Re max.print, not sure why it isn't working for you. I haven't tried printing something really large, but if I do:

> options(max.print=10)
> diffPrint(iris, iris)
No visible differences between objects.
< iris
> iris
@@ 1,4 / 1,4 @@
      Sepal.Length Sepal.Width Petal.Length Petal.Width    Species
  1            5.1         3.5          1.4         0.2     setosa
  2            4.9         3.0          1.4         0.2     setosa
   [ reached getOption("max.print") -- omitted 148 rows ]

It looks like max.print is having an effect.

---

EDIT:
Actually, I just did

options(max.print=999999)
diffPrint(as.data.frame(diamonds), as.data.frame(diamonds))

and I got the whole data.frame.

[chambm]

In this case I am diffing data.frames. I am trying to set max.print to the number of rows. It does have an effect but not what I'd expect. Is it applying the limit to the number of cells rather than rows?

Yeah, using your simple test case illustrates it's based on the number of elements/cells, even though it talks about omitting rows. That's confusing! I'll complain to base. ;)

[brodieG]

That would line up with the iris example above (two rows of five elements each shown with max.print=10).

Also, as a side note since you are diffing data.frames, you might want to set the disp.width value to be large enough such that your data.frames don't wrap as that causes some problems right now.

[chambm]

Yeah that's set to 2000, arbitrarily (I imagine that's based on number of characters, right?

[brodieG]

It's the number of characters that you want to make available for print:

disp.width: integer(1L) number of display columns to take up; note that
in "sidebyside" 'mode' the effective display width is half
this number (set to 0L to use default widths which are
'getOption("width")' for normal styles and '80L' for HTML
styles.