From: Daniel Sheppard <daniels@...>
Date: 2004-04-02T09:25:09+09:00
Subject: Re: error handling

You might want to upgrade to ruby 1.8. I don't believe sqrt is a
recursive function any more in 1.8 (but I don't have ruby on the machine
I'm writing from at the moment, so I couldn't tell you for sure).

> -----Original Message-----
> From: Phidippus [mailto:mopthisandthat@hotmail.com] 
> Sent: Friday, 2 April 2004 2:29 AM
> To: ruby-talk ML
> Subject: error handling
> 
> 
> I'm evaluating a function at various values in a for loop. 
> The function works most of the times (99% of parameter range 
> I am investigating), but at some values, it gives error like 
> below and crushes. I guess something wrong with sqrt 
> function. I'm not going to attempt to show the function here 
> because it is 1.5Mb. If I evaluate the exact same function in 
> Maple at the value it crushed in Ruby, it behaves fine.
> 
> Is there any way that when the (sqrt) function crushes, it 
> gives some sort of error value and go on to evaluating at the 
> next value without crushing the program? I don't want to 
> manually restart the program at the next value each time the 
> program crushes. In R, there is "try" function that can used 
> for this kind of situation.
> 
> Thank you.
> 
> #####
> /usr/lib/ruby/1.6/complex.rb:82:in `initialize': stack level too deep
> (SystemStackError)
>         from /usr/lib/ruby/1.6/complex.rb:63:in `new'
>         from /usr/lib/ruby/1.6/complex.rb:63:in `Complex'
>         from /usr/lib/ruby/1.6/complex.rb:130:in `/'
>         from /usr/lib/ruby/1.6/mathn.rb:244:in `sqrt'
>         from /usr/lib/ruby/1.6/mathn.rb:244:in `sqrt'
>         from /usr/lib/ruby/1.6/mathn.rb:244:in `sqrt'
>         from /usr/lib/ruby/1.6/mathn.rb:244:in `sqrt'
>         from /usr/lib/ruby/1.6/mathn.rb:244:in `sqrt'
>          ... 1461 levels...
>         from rubyHopf0.rb:17:in `each'
>         from rubyHopf0.rb:17
>         from rubyHopf0.rb:16:in `each'
>         from rubyHopf0.rb:16
> 
> 
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