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MathGroup Archive 2007

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Re: plot error messages are completelly missing

  • To: mathgroup at smc.vnet.net
  • Subject: [mg81068] Re: plot error messages are completelly missing
  • From: Szabolcs <szhorvat at gmail.com>
  • Date: Mon, 10 Sep 2007 18:54:17 -0400 (EDT)
  • Organization: University of Bergen
  • References: <fbojp5$jbs$1@smc.vnet.net> <fbqqoe$7c5$1@smc.vnet.net> <fc0grq$bcb$1@smc.vnet.net>

Helen Read wrote:
> I for one am glad that I no longer see those annoying "not a machine 
> size real number" messages. It's no longer a problem to plot a function 
> across an interval where it is not real.

It was possible to (permanently) turn that message off in previous versions.

> For example, I can now plot 
> ArcSec[x] for {x,-5,5} and get a nice looking plot, or plot Sqrt[x] 
> together with Sqrt[x+5] on {x,-5,5} without having to plot them 
> separately and Show. To me this is an improvement.

I agree that it is an improvement that Plot::plnr is not shown for 
complex numbers (only for symbolic expressions), but why wasn't a new, 
separate message added for complex numbers/infinity (it could be off by 
default)?  And why isn't the new Plot::plnr on by default?  Trying to 
plot a symbolic expression is almost always an (unintentional) mistake.

Szabolcs


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