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Re: Avoiding Null output marker from a function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg92418] Re: [mg92388] Avoiding Null output marker from a function
  • From: Curtis Osterhoudt <cfo at lanl.gov>
  • Date: Tue, 30 Sep 2008 21:49:14 -0400 (EDT)
  • Organization: LANL
  • References: <200809301135.HAA22030@smc.vnet.net>
  • Reply-to: cfo at lanl.gov

If Null always shows up as a "multiplier" (as it does in this example), then perhaps the easiest is to just say

    myList/.Null->1

which will replace all those Nulls (to any real power) with unity. 

In[641]:= {-0.00005337553998992267` Null^3, 
  5000.147261086986` Null^3} /. {Null -> 1}

Out[641]= {-0.0000533755, 5000.15}

         Hope that helps!

                           C.O.

On Tuesday 30 September 2008 05:35:30 amannuc1 wrote:
> Dear Mathematica community,
> 
> I am having difficulties that the documentation has not resolved to
> date for me. It is this:
> 
> I have defined a function in a Mathematica notebook and then saved it
> as text to include it in a package. The package currently contains two
> functions. The function of interest returns a 2-element list. The
> numbers the function computes appears to be OK, but an annoying
> "Null^3" is appended, presumably as a placeholder for supressed
> output. Something like:
> 
> \!\({\(-0.00005337553998992267`\)\ Null\^3, 5000.147261086986`\ Null
> \^3}\)
> 
> I would like to eliminate that from the output. When I run the
> function from the notebook, no such 'Null's are seen. The function
> consists of several steps, intermediate variables, a call to FindRoot,
> etc. Semicolons separate these steps, as required.
> 
> Your help is greatly appreciated.
> 
> -Tony
> 
> 



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