Date: Nov 30, 2012 1:16 PM
Author: Steven Lord
Subject: Re: Eval and long format answer

"Nasser M. Abbasi" <nma@12000.org> wrote in message

news:k9apgr$n9d$1@speranza.aioe.org...

> On 11/30/2012 11:09 AM, Nasser M. Abbasi wrote:

>> On 11/30/2012 10:48 AM, Genevieve Masson wrote:

>>> Hi :)

>>>

>>> How to avoid that type of answer (i mean how to evaluate the fractions)

>>> :

>>>

>>>>> Vg2

>>>

>>> Vg2 =

>>>

>>> acos(5784835530832562/5514948135819145 -

>>> (18014398509481984*((3937*sin(thCerc))/20000 - AE*sin(alpha))^2)

>>>

>>

>

>> First you need numbers for those symbols you have there: thCerc,AE,alpha

>> etc...

>> use subs().

>> Then you should be able to just use double() around the whole thing.

>>

>

> Also, you can try simplify on the symbolic expression. It helped

>

> EDU>> syms thCerc AE alpha

> EDU>> VG2=... what you had above...

> EDU>> simplify(VG2)

> acos(12389/11811 - (17592186044416*(3937*sin(thCerc) -

> 20000*AE*sin(alpha))^2)/390625)

If you just want to display approximations to the numeric values without

substituting in for the symbolic variables, use VPA.

--

Steve Lord

slord@mathworks.com

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