MathGroup Archive 2011

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: plot error messages are completelly missing

  • To: mathgroup at
  • Subject: [mg116901] Re: plot error messages are completelly missing
  • From: Helen Read <readhpr at>
  • Date: Fri, 4 Mar 2011 03:37:33 -0500 (EST)
  • References: <iknsm2$kd1$>

On 3/3/2011 6:05 AM, john wrote:
> Hello,
> Apologies if this isn't the proper way to submit, it seemed to be from
> This is a late reply on the subject which came up Sep 10 2007!
> Using Mathematica 8 recently, I was working with a complicated function, which
> I'd Plot[]ted.  None of the results I was getting made sense.  Eventually, I
> discovered that where the function appeared to be zero in the plot it was
> actually imaginary, and everything fell into place.  I hadn't considered this
> possibility because I've been used to the Plot[] behaviour of version 5.2 (and
> previous versions) where error messages reported the function not being real.
> So, I strongly agree with Szabolcs comment that there should be a message for
> complex numbers/infinity.  Personally, I think error messages should be on by
> default.  I want to know when things are going wrong, and not be left believing
> misleading information.

I completely disagree on that. In the old days, something like 
Plot[{x^2,Sqrt[x]},{x,-5,5}] generated error messages. It was utterly 
annoying, and served no useful purpose IMHO. I'm very glad those 
messages are long gone.

Helen Read
University of Vermont

  • Prev by Date: Re: Alternative to DumpSave
  • Next by Date: Re: Patterns with conditions
  • Previous by thread: plot error messages are completelly missing
  • Next by thread: Re: plot error messages are completelly missing