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evaluating functions and displaying results numerically

• To: mathgroup at smc.vnet.net
• Subject: [mg126159] evaluating functions and displaying results numerically
• From: Eduardo Fontana <prof.eduardofontana at gmail.com>
• Date: Sat, 21 Apr 2012 00:33:05 -0400 (EDT)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

Once in a while a face a problem with Mathematica in which I cannot
get a straightforward numerical output.
I have a function defined in mathematica, I try to evaluate the
function with numerical arguments and mathematica returns a replica of
my function with the same arguments. It must be something I set
without noticing. I cannot get numerical results at all.
In another instance, I have a summation of about 1000 terms defined as
a function of 3 arguments. When I use numerical arguments, instead of
Mathematica calculating a numerical result it generates a symbolic
output with all 1000 terms. Even if a try something very simple such
as
In[1]: Sin[1]
the output is
Out[1]: Sin[1]
Could anyone give me a clue on this?
regards

• Follow-Ups:
  • Re: evaluating functions and displaying results numerically
    • From: Murray Eisenberg <murray@math.umass.edu>
  • Re: evaluating functions and displaying results
    • From: Tomas Garza <tgarza10@msn.com>
  • Re: evaluating functions and displaying results numerically
    • From: Bob Hanlon <hanlonr357@gmail.com>