Error handling

ruby-talk
1

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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