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  1. PO
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    <p>When you call plot on an object of class histogram (like c1), it calls the S3 method for the histogram. Namely, <code>plot.histogram</code>. You can see the code for this function if you type <code>graphics:::plot.histogram</code> and you can see its help under <code>?plot.histogram</code>. The help file for that function states:</p> <blockquote> <p>freq logical; if TRUE, the histogram graphic is to present a representation of frequencies, i.e, <code>x$counts</code>; if FALSE, relative frequencies (probabilities), i.e., x$density, are plotted. The default is true for equidistant breaks and false otherwise.</p> </blockquote> <p>So, when plot renders a histogram it doesn't use the previously specified <code>probability</code> or <code>freq</code> arguments, it tries to figure it out for itself. The reason for this is obvious if you dig around inside <code>c1</code>, it contains all of the data necessarily for the plot, but does not specify how it should be rendered.</p> <p>So, the solution is to reiterate the argument <code>freq=FALSE</code> when you run the plot functions. Notably, <code>freq=FALSE</code> works whereas <code>probability=TRUE</code> does not because <code>plot.histogram</code> does not have a probability option. So, your plot code will be:</p> <pre><code>plot(c1, col=rgb(1,0,0,1/4), xlim=c(minx,maxx), main=paste(paramlab,"Group",groupnum,sep=" "),xlab="",freq=FALSE)# first histogram plot(c2, col=rgb(0,0,1,1/4), xlim=c(minx,maxx), add=T, freq=FALSE) </code></pre> <p>This all seems like a oversight/idiosyncratic decision (or lack thereof) on the part of the R devs. To their credit it is appropriately documented and is not "unexpected behavior" (although I certainly didn't expect it). I wonder where such oddness should be reported, if it should be reported at all.</p>
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    1. COGreat! It works perfectly. Thanks.
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    2. CO@Lio: That's great to hear. Would you please mark the answer as accepted? (The checkmark).
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