[R] Show only header of str() function

[Luigi Marongiu]

Thanks, that is perfect!

On Thu, Sep 2, 2021 at 7:02 PM Deepayan Sarkar
<deepayan.sarkar using gmail.com> wrote:
>
> On Thu, Sep 2, 2021 at 9:26 PM Enrico Schumann <es using enricoschumann.net> wrote:
> >
> > On Thu, 02 Sep 2021, Luigi Marongiu writes:
> >
> > > Hello, is it possible to show only the header (that is: `'data.frame':
> > > x obs. of  y variables:` part) of the str function?
> > > Thank you
> >
> > Perhaps one more solution. You could limit the number
> > of list components to be printed, though it will leave
> > a "truncated" message.
> >
> >     str(iris, list.len = 0)
> >     ## 'data.frame':    150 obs. of  5 variables:
> >     ##   [list output truncated]
>
> Or use 'max.level', which is also generally useful for nested lists:
>
> str(iris, max.level=0)
> ## 'data.frame':    150 obs. of  5 variables:
>
> Best,
> -Deepayan
>
> > Since 'str' is a generic function, you could also
> > define a new 'str' method. Perhaps something among
> > those lines:
> >
> >     str.data.frame.oneline <- function (object, ...) {
> >         cat("'data.frame':\t", nrow(object), " obs. of  ",
> >             (p <- length(object)),
> >             " variable", if (p != 1) "s", "\n", sep = "")
> >         invisible(NULL)
> >     }
> >
> > (which is essentially taken from 'str.data.frame').
> >
> > Then:
> >
> >     class(iris) <- c("data.frame.oneline", class(iris))
> >
> >     str(iris)
> >     ## 'data.frame':  150 obs. of  5 variables
> >
> >     str(list(a = 1,
> >              list(b = 2,
> >                   c = iris)))
> >     ## List of 2
> >     ##  $ a: num 1
> >     ##  $  :List of 2
> >     ##   ..$ b: num 2
> >     ##   ..$ c:'data.frame':   150 obs. of  5 variables
> >
> >
> >
> >
> > --
> > Enrico Schumann
> > Lucerne, Switzerland
> > http://enricoschumann.net
> >
> > ______________________________________________
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> > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.



-- 
Best regards,
Luigi