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How to see the implementation of print function for a class from a package?
4 messages · Majid Einian, R. Michael Weylandt
I presume your problem is that you are looking for non-exported methods in some unstated package. Generally the pattern is something like this methods(plot) # shows all plot.* methods methods(class = "lm") # shows all *.lm methods Those marked with a star are not exported but you can get at them with the getAnywhere() function [you can also use three colons instead of two, but that requires you to know the function at hand] Incidentally, you might also want to download the package source from CRAN and browse it to see the author's commented code. Michael
On Sat, Jun 9, 2012 at 10:53 PM, Majid Einian <einian85 at gmail.com> wrote:
Dear R-helpers, I want to see the code used when printing (using print(object) or by just typing the object name) for a class from a package. I can see the summary code using packagename::summary.classname but nothing for print method and also plot methods. In general, how can I see the COMPLETE code for a package? not just the function defs? -- Majid Einian, PhD Candidate in "Economics", Graduate School of Management and Economics, Sharif University of Technology, Tehran, IRAN ? ? ? ?[[alternative HTML version deleted]]
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
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Perhaps it's an S4 object? You can test that with isS4() and, if it is, try
showMethods("show")
showMethods(class = "datation")
getMethod("show", "datation")
Note that it's also entirely possible that your object doesn't have a
print method and instead falls back on print.default or some other
inherited method, though that doesn't seem to be the case here. E.g.,
x <- 1:5
class(x) <- "flub"
print(x) # Uses print.default b/c there's no print.flub
It would be helpful if you could say where the package is from so the
rest of us could look at it and help you more effectively.
Michael
On Sun, Jun 10, 2012 at 12:49 AM, Majid Einian <einian85 at gmail.com> wrote:
I am working on the package "datation" and it is not on CRAN. On Sun, Jun 10, 2012 at 8:28 AM, R. Michael Weylandt <michael.weylandt at gmail.com> wrote:
I presume your problem is that you are looking for non-exported methods in some unstated package. Generally the pattern is something like this methods(plot) # shows all plot.* methods methods(class = "lm") # shows all *.lm methods
methods(class="datation")
[1] summary.datation ?so there I can see only summary. but I know that there should be a print function too:
CEPR
Datation name : CEPR Business Cycle Dating Committee Peaks Troughs Duration 1 1974Q3 1975Q1 2 2 1980Q1 1982Q3 10 3 1992Q1 1993Q3 6
class(CEPR)
[1] "datation" attr(,"package") [1] "datation"
Those marked with a star are not exported but you can get at them with the getAnywhere() function [you can also use three colons instead of two, but that requires you to know the function at hand]
getAnywhere shows me that there are methods for plot in this package, but I cannot see the implementation e.g. plot.datation
Incidentally, you might also want to download the package source from CRAN and browse it to see the author's commented code.
Well, the package is not on CRAN, and the author has not answered my last email!
Michael On Sat, Jun 9, 2012 at 10:53 PM, Majid Einian <einian85 at gmail.com> wrote:
Dear R-helpers, I want to see the code used when printing (using print(object) or by just typing the object name) for a class from a package. I can see the summary code using packagename::summary.classname but nothing for print method and also plot methods. In general, how can I see the COMPLETE code for a package? not just the function defs? -- Majid Einian, PhD Candidate in "Economics", Graduate School of Management and Economics, Sharif University of Technology, Tehran, IRAN ? ? ? ?[[alternative HTML version deleted]]
______________________________________________ R-help at r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
-- Majid Einian, PhD Candidate in "Economics", Graduate School of Management and Economics, Sharif University of Technology, Tehran, IRAN