[scilab-Users] what am I doing wrong

[Maso RICCI]

try this into the console:

help ^

/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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>
>

-- 
----------------------------------------
Maso RICCI PhD
Dipartimento Farmaco Chimico Tecnologico
Università degli Studi di Siena
Via Aldo Moro,2
Siena

phone: +390577234367
email: ricci2 at unisi.it
----------------------------------------