[R] Plotting numbers at a specified decimal length on a plot()

[P Ehlers]

I find sprintf() useful for this.

Compare
lab <- rnorm(8)
plot(1:10)
text(2:9, 2:9, lab)

with
lab2 <- sprintf("%4.2f", lab)
plot(1:10)
text(2:9, 2:9, lab2)

  - Peter Ehlers

Matthew Dubins wrote:
> Hi there,
> 
> I want to figure out how to plot means, with 2 decimal places, of any Y 
> variable on a scatterplot according to any X variable (which obviously 
> should have limited scope).  I already figured out how to plot the 
> means, but without limiting their precision to 2 decimal places.  This 
> is the code I used once I had the scatterplot drawn:
> 
> text(c(1990, 1992, 1994, 1996, 1998, 1999, 2000, 2001, 2002, 2003), 25, 
> mean.yrly.closures$values, cex=.7)
> 
> 
> It's a plot of school closures by Year.  The closures variable is 
> labeled "values" in the "mean.yrly.closures" data set.  I managed to 
> *display* the mean.yrly.closures data set with a precision of 2 decimal 
> places (options(digits=2)), but then once I plotted the numbers, they 
> showed up with many decimal places. 
> 
> It would be nice to figure this out so that I don't have to rely on 
> Excel to make changes to the precision!
> 
> Thanks,
> Matthew Dubins
> 
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