Re: evaluating functions and displaying results numerically

*To*: mathgroup at smc.vnet.net*Subject*: [mg126165] Re: evaluating functions and displaying results numerically*From*: "Nasser M. Abbasi" <nma at 12000.org>*Date*: Sun, 22 Apr 2012 06:06:41 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <jmtdec$sjd$1@smc.vnet.net>*Reply-to*: nma at 12000.org

On 4/20/2012 11:35 PM, Eduardo Fontana wrote: > 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 > thats becuase it defaults to keeping things in symbolic form. If you want numeric result, then you need to tell it. Either use In[2]:= Sin[1.] Out[2]= 0.841471 or use N on the result In[3]:= N[Sin[1],$MachinePrecision] Out[3]= 0.8414709848078965 --Nasser