       Re: Solving Polynomial equation

• To: mathgroup at smc.vnet.net
• Subject: [mg100968] Re: [mg100901] Solving Polynomial equation
• From: Murray Eisenberg <murray at math.umass.edu>
• Date: Thu, 18 Jun 2009 20:49:00 -0400 (EDT)
• Organization: Mathematics & Statistics, Univ. of Mass./Amherst
• References: <200906180850.EAA19763@smc.vnet.net>

```Let's say your Excel spreadsheet is abc.xls and it's in directory
e:\temp.  Assume it has column headers a, b, c in row 1 and then the
data in columns below. (You didn't mention values of the constant c in
your quadratic, but I'll assume you have those, too; if not, you can

(* say where file is *)
SetDirectory[e:/temp]

abc = Import["abc.xls",{"Data",1}]

(* strip off first element, which is column headers *)
abc = Rest[abc]

(* set up form of quadratic eq'n in pure function... *)
(* ... and map onto the abc values *)
Solve[#[] x^2+#[] x + #[]==0,x]&/@abc

As usual in Mathematica, you'll get the solutions in the form of lists
of rules, one list for each {a,b,c} triple.

kosal lee wrote:
> Hello
>
> I need help and I am new to Mathematica.
>
> Suppose I want to solve for the equation:  aX^2 + bx +c ==0, however
> I have a list of parameters a and b in my microsoft excel where a and b are columns and its value are in rows.
>
> I dont want to key every a and b each time to find the root of above equation.
>
> Are there anyway to tell Mathematica to import each a and b value from excel, put it in the above equation, and find its root
> and it export the list of results back to excel?
>
>
> Thank you.
> Best Regards,
> Kosal
>
>

--
Murray Eisenberg                     murray at math.umass.edu
Mathematics & Statistics Dept.
Lederle Graduate Research Tower      phone 413 549-1020 (H)
University of Massachusetts                413 545-2859 (W)
710 North Pleasant Street            fax   413 545-1801
Amherst, MA 01003-9305

```

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