title: How to set ',' as decimal separator with R
body: <p>Even though my Windows 7 locale settings specify using "," as a decimal separator, R and RStudio give me a "." separator. Is there any way to change this? Note the "LC_NUMERIC=C" setting in the locale below: this seems to be forced by R or RStudio.  </p>
  
  <p>As I am in the middle of a long project, I am unwilling to change right away to R 3.0 and the last RStudio version. Does anybody know is there is any change regarding the decimal separator issue in these versions?</p>
  
  <p>I am using prettyNum to solve the problem for single numbers, but I don't know how to use it on a table.  </p>
  
  <p>sessionInfo()
      R version 2.15.3 (2013-03-01)
      Platform: x86_64-w64-mingw32/x64 (64-bit)</p>
  
  <pre><code>locale:
  [1] LC_COLLATE=Spanish_Argentina.1252  LC_CTYPE=Spanish_Argentina.1252   
  [3] LC_MONETARY=Spanish_Argentina.1252 LC_NUMERIC=C                      
  [5] LC_TIME=Spanish_Argentina.1252    
  
  attached base packages:
  [1] grid      splines   stats     graphics  grDevices utils     datasets  methods  
  [9] base     
  
  other attached packages:
   [1] ascii_2.1          randomForest_4.6-7 pander_0.3.3       fpc_2.1-5         
   [5] flexmix_2.3-10     mclust_4.0         cluster_1.14.3     MASS_7.3-23       
   [9] Gmisc_0.5.0.0      testthat_0.7       boot_1.3-7         rms_3.6-3         
  [13] miscTools_0.6-16   stringr_0.6.2      Hmisc_3.10-1       survival_2.37-2   
  [17] lattice_0.20-13    xtable_1.7-1       pixmap_0.4-11      RColorBrewer_1.0-5
  [21] ade4_1.5-1        
  
  loaded via a namespace (and not attached):
  [1] digest_0.6.3      evaluate_0.4.3    modeltools_0.2-19 stats4_2.15.3    
  [5] tools_2.15.3  
  </code></pre>