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Re: problem writing debugging utility function

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  • Subject: [mg100307] Re: [mg100248] problem writing debugging utility function
  • From: Ken Levasseur <klevasseur at>
  • Date: Sun, 31 May 2009 06:37:24 -0400 (EDT)
  • References: <>

I use this function:
peek = (Print[#1]; #1) &
My programming style is to pipe functions:
so sticking in a //peek is easy.

Ken Levasseur

On May 29, 2009, at 8:57 PM, dabrowsa at wrote:

> This matter is pretty unimportant, but perhaps of interest in laying
> out a persistent source confusion for me with Mathematica: evaluation
> control.
> I'm skeptical of the built-in debugger because it seems to crash the
> kernel often, so I do most of my debugging by inserting print
> statements like
>    Print["variableOne = ",variableOne].
> Being extraordinarily lazy I soon thought it might be nice to have a
> little function, say dbgv, which takes a variable or name of a
> variable as an argument, and produces the same result as the print
> statement above.
> At first I assumed this would be easy, since almost every programming
> problem turns out to be pretty easy with Mathematica.  But after an  
> hour
> or so I began to wonder whether it would be possible at all.  I did
> eventually find a solution, a function dbgv such that  
> dbgv[variableOne]
> produces exactly the effect of the print statement, but it's really  
> ugly.
> I'll post it later.
> Granted this is not an important problem since it's not too much
> trouble to just type in the whole print statement.  But it's worth
> noting that this would trivial to solve with a Lisp macro, and despite
> the fantastic expressibility of Mathematica it doesn't seem to have a
> good replacement for macros.  The closest equivalents are $Pre(Read),
> which I used in my solution, but they're not nearly as nice to work  
> with.
> Can anyone think of an elegant solution?

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