[R] How to store histogram plots

Ott Toomet otoomet at econ.dk
Mon Mar 10 09:46:35 CET 2003

Dear Hong,

Why do you want to save the histogram on the disk?  Is it not enough
just to draw them one-by-one and read in only the data necessary for
the current one?

However, you may consider:

1) look what the hist() returns.  In particular, it has $counts
   component which you may use in order to draw a pre-calculated
   histogram later (using barplot()).  Now save the returned list
   either in a list or to the disk (using save()).  Later plot all the
   histograms.  In fact, here you are not limited with different
   histograms on different panels, you may e.g. put color-coded bars
   from different histograms on the same plot, fit a surface
   etc.  This is the flexible way.

2) Divide the graphic screen (e.g. using par(mfrow)), read the
   datasets one-by-one and plot corresponding histograms.  This is a
   simpler way.



 | From: "hongqin" <hongqin at uchicago.edu>
 | Date: Sat, 8 Mar 2003 11:01:20 -0600
 | Hello all,
 | Is there any way to save histogram results to a file and then read it
 | back later? I am dealing with several sets of data that are too large to
 | be loaded in the same R process, but I want to plot their histogram side
 | by side for comparison. I am also considering how to use the 'wireframe'
 | function to plot these histograms in the same figure. Any suggestions
 | will be greatly appreciated. 
 | Thanks,
 | Hong

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