Typesetting of R objects is problematic

[gvol]

Typesetting of R objects requires the R package Hmisc. Unfortunately, even after this is installed things are a bit weird. Calling latex the first time fails, but succeeds thereafter.

+--------------------------------------------------------------------+
| Sage Version 5.10, Release Date: 2013-06-17                        |
| Type "notebook()" for the browser-based notebook interface.        |
| Type "help()" for help.                                            |
+--------------------------------------------------------------------+
sage: latex(r("1+2"))
---------------------------------------------------------------------------
RuntimeError                              Traceback (most recent call last)
<ipython-input-1-0a8044ad4f2e> in <module>()
----> 1 latex(r("1+2"))

/Users/ivanandres/SageStuff/sage-5.10/local/lib/python2.7/site-packages/sage/misc/latex.pyc in __call__(self, x, combine_all)
    934         """
    935         if has_latex_attr(x):
--> 936             return LatexExpr(x._latex_())
    937         try:
    938             f = latex_table[type(x)]

/Users/ivanandres/SageStuff/sage-5.10/local/lib/python2.7/site-packages/sage/interfaces/r.pyc in _latex_(self)
   1851             P.library('Hmisc')
   1852         except ImportError:
-> 1853             raise RuntimeError, "The R package 'Hmisc' is required for R to LaTeX conversion, but it is not available."
   1854         return LatexExpr(P.eval('latex(%s, file="");'%self.name()))
   1855

RuntimeError: The R package 'Hmisc' is required for R to LaTeX conversion, but it is not available.
sage: latex(r("1+2"))
% latex.default(sage1, file = "")
%
\begin{table}[!tbp]
\begin{center}
\begin{tabular}{r}
\hline\hline
\multicolumn{1}{c}{}\tabularnewline
\hline
$3$\tabularnewline
\hline
\end{tabular}
\end{center}
\end{table}

This seems to be because of how the output from R is parsed. When Hmisc is first loaded it prints a "banner" which is misparsed as failing. After that, things work fine since no banner is printed. I don't know anything about R, but perhaps we could pass quietly=TRUE to require to avoid the banner?

sage: r.library('Hmisc')
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-9e4e08408e41> in <module>()
----> 1 r.library('Hmisc')

/Users/ivanandres/SageStuff/sage-5.10/local/lib/python2.7/site-packages/sage/interfaces/r.pyc in library(self, library_name)
    592         # try hard to parse the message string in a locale-independent way
    593         if ' library(' in ret:       # locale-independent key-word
--> 594             raise ImportError, "%s"%ret
    595         else:
    596             try:

ImportError: Loading required package: Hmisc
Loading required package: survival
Loading required package: splines
Loading required package: Formula
Hmisc library by Frank E Harrell Jr

Type library(help='Hmisc'), ?Overview, or ?Hmisc.Overview')
to see overall documentation.


Attaching package: ‘Hmisc’

The following object(s) are masked from ‘package:survival’:

    untangle.specials

The following object(s) are masked from ‘package:base’:

    format.pval, round.POSIXt, trunc.POSIXt, units

Component: interfaces

Keywords: R, latex

Issue created by migration from https://trac.sagemath.org/ticket/15068