[scilab-Users] what am I doing wrong

[Celso Co]

Ismael, That is elegant. cco

On Wed, Sep 14, 2011 at 9:36 PM, A. Ismael F. Vaz <aivaz at dps.uminho.pt> wrote:
> Hi,
>
> This is better explained by using precedencies in mathematical expressions.
> First we solve what's in parenthesis, then potentiation, then multiplication
> and division, and in the end the summation and subtractions from left to
> right.
>
> In -10^2 the potentiation has priority over the subtraction.
>
> In (-10)^2 the parenthesis has priority over the potentiation.
>
> You obtain exactly the same behavior using a scientific calculator, in fact
> I warn my students about this when I taught Numerical Methods.
>
> Best regards,
> Ismael
>
> -----Mensagem original-----
> De: Carrico, Paul [mailto:paul.carrico at esterline.com]
> Enviada: quarta-feira, 14 de Setembro de 2011 14:28
> Para: users at lists.scilab.org
> Assunto: RE: [scilab-Users] what am I doing wrong
>
> Well
>
> Imagine you're computing a function such as : f = x(1)^2 - x(2)^2 ... The
> negative sign is not influence by the square, isn't it ?
>
> Be rigorous in using parentheses ....
>
> Paul
>
>
> -----Message d'origine-----
> De : Maso RICCI [mailto:ricci2 at unisi.it] Envoyé : mercredi 14 septembre 2011
> 15:25 À : users at lists.scilab.org Objet : Re: [scilab-Users] what am I doing
> wrong
>
> got it ...
>
> thanks for helping me
>
> but is it not a little confusing ?
>
> /maso
>
> Il 14/09/2011 15.20, Carrico, Paul ha scritto:
>> Try (-10)^2
>>
>> Different from -1*10^2 == -1*(10)^2
>>
>> Paul
>>
>>
>> Please consider the environment before printing this e-mail
>>
>>
>> -----Message d'origine-----
>> De : Maso RICCI [mailto:ricci2 at unisi.it] Envoyé : mercredi 14
>> septembre 2011 15:18 À : users at lists.scilab.org Objet : [scilab-Users]
>> what am I doing wrong
>>
>> Ehm... pretty sure I am going to place a dummy question
>>
>> but I got to do it:
>>
>> is it corret the below result from my scilab console ?
>>
>> -->-10^2
>>    ans  =
>>
>>     - 100.
>>
>> thanks
>>
>> /maso
>>
>
> --
> ----------------------------------------
> Maso RICCI PhD
> Dipartimento Farmaco Chimico Tecnologico Università degli Studi di Siena Via
> Aldo Moro,2 Siena
>
> phone: +390577234367
> email: ricci2 at unisi.it
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Eng'r Celso B. Co, PhD ECE
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