Re: evaluating functions and displaying results numerically

*To*: mathgroup at smc.vnet.net*Subject*: [mg126171] Re: evaluating functions and displaying results numerically*From*: Bob Hanlon <hanlonr357 at gmail.com>*Date*: Sun, 22 Apr 2012 06:08:46 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <201204210433.AAA29272@smc.vnet.net>

If you give Mathematica an exact input, it will only provide an exact output even if that requires maintaining the input form x1 = Sin[1] Sin[1] Compare with what happens with an inexact input x2 = Sin[1.] 0.841471 An exact result can be converted with N x3 = Sin[1] // N 0.841471 x1 == x2 == x3 True Some exact results are immediately available Sin[Pi/4] 1/Sqrt[2] Bob Hanlon On Sat, Apr 21, 2012 at 12:33 AM, Eduardo Fontana <prof.eduardofontana at gmail.com> 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 >

**References**:**evaluating functions and displaying results numerically***From:*Eduardo Fontana <prof.eduardofontana@gmail.com>