[scilab-Users] what am I doing wrong

[Mathieu Dubois]

On 09/14/2011 03:54 PM, Maso RICCI wrote:
> try this into the console:
>
> help ^
I can't see the precedence of operators here...
>
> /maso
>
> Il 14/09/2011 15.44, Mathieu Dubois ha scritto:
>> Hello,
>>
>> I haven't found a list of operator's precedence in the documentation. 
>> Is that normal?
>>
>> I have found this website (warning it refers to an old version of 
>> scilab):
>> http://kiwi.emse.fr/SCILAB/sci-bot/c727.htm#SECT-OPERATOR-PRECEDENCE
>>
>> Mathieu
>> On 09/14/2011 03:36 PM, A. Ismael F. Vaz 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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>>
>>
>