Re: Divide by zero or how to overload a function

[Brett Viren]

Keith Wright writes:
 > The users are just a little confused.  The proper thing to do is to
 > catch the error just before plotting, and plot a vertical line.

This would also be okay, and even a preferable solution, but how?
Currently I evaluate the user functions via this method:

SCM EOS::Guile::EvalCatch(SCM& proc) 
{ 
    return scm_catch(SCM_BOOL_T, proc, fErrorHandlerProc); 
} 

where:

fErrorHandlerProc = gh_eval_str("(lambda (key . args) "
    "(display (list \"Error in proc:\" key \" args: \" args)) (newline))"); 

Maybe this isn't the best way to do things, but how might I catch just
divide-by-zero in order to plot the vertical line but have all other
errors handled with this generical warning?

-Brett.