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    <p>You've received some good solutions to your immediate problem, but I thought I'd answer the "Why?" portion. R's documentation in this instance is correct, but perhaps not as transparent as it could be.</p> <p>If you examine the section of <code>?par</code> describing <code>xaxp</code>, you'll find:</p> <blockquote> <p>This parameter is reset when a user coordinate system is set up, for example by starting a new page or by calling plot.window or setting par("usr"): n is taken from par("lab").</p> </blockquote> <p>Under <code>yaxp</code>, the same warning is not given, but instead it says simple 'See <code>xaxp</code>'. There is no similar warning for the <code>usr</code> parameter in <code>?par</code>, but the same is probably the case, since if we look up <code>?plot.window</code> we see:</p> <blockquote> <p>A side-effect of the call is to set up the usr, xaxp and yaxp</p> </blockquote> <p>So what's happening is that a call to <code>plot</code> eventually leads to calling <code>plot.window</code>, a side effect of which is to actually <em>reset</em> the settings for <code>usr</code>, <code>xaxp</code> and <code>yaxp</code>. Unless, of course, you have passed those arguments directly to a higher level function like <code>plot</code> that in turn hands them off down the line to <code>plot.window</code>.</p> <p>Personally, I think this deserves mention in the Details section of <code>?par</code> along with the list of parameters that can <em>only</em> be set by using <code>par()</code> rather than passing them to high level plotting functions.</p>
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    1. COHi joran, that's a really interessting information! But If I understood correctly what you found out, it does NERVER make sense to use one of the arguments usr, xaxp and yaxp in par, because they will be resetted from the polt function. Or can you think of a case, where it does make sense??
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