Re: Mathematica- Use a previous equation into the function Function

*To*: mathgroup at smc.vnet.net*Subject*: [mg111537] Re: Mathematica- Use a previous equation into the function Function*From*: David Bailey <dave at removedbailey.co.uk>*Date*: Wed, 4 Aug 2010 05:56:53 -0400 (EDT)*References*: <i33cvi$87q$1@smc.vnet.net>

On 01/08/10 09:58, Camille wrote: > Dear All, > > I am fairly new to mathematica. I am stuck with a problem I cannot solve. I would like to call a previous equation into the function Function. If a type directly the expression or copy paste it, it works. However, when I call the expression by its name it does not. > Here is the code for a more precise explanation: > > In: ll > Out: d + a x + h x^2 + b y + e x y + c z + j z^2 > > In: Function[##, a x + b y + c z + d + e x y + h x^2 + j z^2]& @@ {Listp} > Out: Function[{a, b, c, d, e, h, j}, > a x + b y + c z + d + e x y + h x^2 + j z^2] > > It works well and I can use it to generate as many equations I want by replacing the variables a,b,c,d,e,h,j. > But if I do: > > In:Function[##, ll]& @@ {Listp} > Out:Function[{a, b, c, d, e, h, j}, ll] > > And I cannot use it. > > Any suggestions? > > Thanks in advance. Do not hesitate to post if you need some further information. Sorry for my bad english. > > Camille > Since you say you are fairly new to Mathematica, I am wondering if you are adopting the above, rather obscure style from choice. I would simply define a named function to do what you want: In[2]:= buildExpression[a_,b_,c_,d_,e_,h_,j_]:=a x+b y+c z+d+e x y+h x^2+j z^2; In[5]:= buildExpression[1,2,3,4,5,6,7] Out[5]= 4+x+6 x^2+2 y+5 x y+3 z+7 z^2 In[6]:= buildExpression[q+1,q+2,q+3,q+4,q+5,q+6,q+7] Out[6]= 4+q+(1+q) x+(6+q) x^2+(2+q) y+(5+q) x y+(3+q) z+(7+q) z^2 David Bailey http://www.dbaileyconsultancy.co.uk