I hit send button too fast.
Thanks for this alternative solution,
Naresh
From: R-help <r-help-boun...@r-project.org> on behalf of Naresh Gurbuxani
<naresh_gurbux...@hotmail.com>
Sent: Wednesday, March 23, 2022 6:16 PM
To: David Carlson <dcarl...@tamu.edu>
Cc: r-help mailing list <r-help@r-project.org>; John Fox <j...@mcmaster.ca>
Subject: Re: [R] print only a few lines of an object
Sent from my iPhone
> On Mar 23, 2022, at 5:37 PM, David Carlson via R-help <r-help@r-project.org>
> wrote:
>
> You can set the "max.print" option to something other than the default
> value of 99999, e.g. options(max.print=50). The number is not lines,
> or characters as far as I can tell. For example setting max.print=50
> causes print(iris) to display the first 10 lines followed by a
> warning. On a list object it seems to apply to each part of the list,
> (e.g. split(iris, iris$Species) prints 10 lines of each species. This
> is a crude tool that is mostly useful if you are working with large
> objects and have a bad tendency to type the object name without
> thinking.
>
> David L Carlson
>
>
>> On Wed, Mar 23, 2022 at 3:32 PM John Fox <j...@mcmaster.ca> wrote:
>>
>> Dear Jeff, On 2022-03-23 3:36 p.m., Jeff Newmiller wrote: > After-thought...
>> > > Why not just use head() and tail() like normal R users do? head() and
>> tail() are reasonable choices if there are many rows, but not if there are
>> many ZjQcmQRYFpfptBannerStart
>> This Message Is From an External Sender
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>>
>> Dear Jeff,
>>
>>> On 2022-03-23 3:36 p.m., Jeff Newmiller wrote:
>>> After-thought...
>>>
>>> Why not just use head() and tail() like normal R users do?
>>
>> head() and tail() are reasonable choices if there are many rows, but not
>> if there are many columns.
>>
>> My first thought was your previous suggestion to redefine print()
>> methods (although I agree with you that this isn't a good idea), but
>> though I could get that to work for data frames, I couldn't for matrices.
>>
>> Adapting my preceding examples using car::brief():
>>
>>> X <- matrix(rnorm(20000*200), nrow = 20000)
>>
>>> library("car")
>> Loading required package: carData
>>
>>> print.data.frame <- function(x, ...){ # not recommended!
>> + brief(x, ...)
>> + invisible(x)
>> + }
>>
>>> as.data.frame(X)
>> 20000 x 200 data.frame (19995 rows and 195 columns omitted)
>> V1 V2 V3 . . . V199 V200
>> [n] [n] [n] [n] [n]
>> 1 -1.1810658 -0.6090037 1.0057908 1.23860428 0.6265465
>> 2 -1.6395909 -0.2828005 -0.6418150 1.12875894 -0.7594760
>> 3 0.2751099 0.2268473 0.2267713 0.64305445 1.1951732
>> . . .
>> 19999 1.2744054 1.0170934 -1.0172511 -0.02997537 0.7645707
>> 20000 -0.4798590 -1.8248293 -1.4664622 -0.06359483 0.7671203
>>
>>
>>> print.matrix <- function(x, ...){ # not recommended (and doesn't work)!
>> + brief(x, ...)
>> + invisible(x)
>> + }
>>
>>> X
>> [,1] [,2] [,3] [,4]
>> [,5]
>> [1,] -1.181066e+00 -6.090037e-01 1.005791e+00 3.738742e+00
>> -6.986169e-01
>> [2,] -1.639591e+00 -2.828005e-01 -6.418150e-01 -7.424275e-01
>> -1.415092e-01
>> [3,] 2.751099e-01 2.268473e-01 2.267713e-01 -6.308073e-01
>> 7.042624e-01
>> [4,] -9.210181e-01 -4.617637e-01 1.523291e+00 4.003071e-01
>> -2.792705e-01
>> [5,] -6.047414e-01 1.976075e-01 6.065795e-01 -8.074581e-01
>> -4.089352e-01
>>
>> . . . [many lines elided]
>>
>> [,196] [,197] [,198] [,199]
>> [,200]
>> [1,] -1.453015e+00 1.347678e+00 1.189217e+00 1.238604e+00
>> 0.6265465033
>> [2,] -1.693822e+00 2.689917e-01 -1.703176e-01 1.128759e+00
>> -0.7594760299
>> [3,] 1.260585e-01 6.589839e-01 -7.928987e-01 6.430545e-01
>> 1.1951731814
>> [4,] -1.890582e+00 7.614779e-01 -5.726204e-01 1.090881e+00
>> 0.9570510645
>> [5,] -8.667687e-01 5.365750e-01 -2.079445e+00 1.209543e+00
>> -0.2697400234
>> [ reached getOption("max.print") -- omitted 19995 rows ]
>>
>> So, something more complicated that I don't understand is going on with
>> matrices.
>>
>> Best,
>> John
>>
>>>
>>>> On March 23, 2022 12:31:46 PM PDT, Jeff Newmiller
>>>> <jdnew...@dcn.davis.ca.us> wrote:
>>>> Sure. Re-define the print method for those objects. Can't say I recommend
>>>> this, but it can be done.
>>>>
>>>>> On March 23, 2022 11:44:01 AM PDT, Naresh Gurbuxani
>>>>> <naresh_gurbux...@hotmail.com> wrote:
>>>>> In an R session, when I type the name of an object, R prints the entire
>>>>> object (for example, a 20000 x 5 data.frame). Is it possible to change
>>>>> the default behavior so that only the first five and last five rows are
>>>>> printed?
>>>>>
>>>>> Similarly, if the object is a 20000 x 200 matrix, the default behavior
>>>>> will be to print first five and last five columns, combined with first
>>>>> five and last five rows.
>>>>>
>>>>> Thanks,
>>>>> Naresh
>>>>> ______________________________________________
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>>>>> and provide commented, minimal, self-contained, reproducible code.
>>>>
>>>
>>
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>
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______________________________________________
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______________________________________________
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