Subject: assign numerical value from a previous line
From: Zbigniew Komarnicki
Date: Thu, 15 Jul 2010 18:00:36 +0200
On Wednesday 14 of July 2010 18:39:22 William Porter wrote:
> Hello,
>
>
>
> I am a new user and having difficulty finding a method to assign a value
> from a previous line.
(%i1) e1: x^2+d*y*4+d^2*(-4);
2 2
(%o1) 4 d y + x - 4 d
(%i2) e2: subst([y=0,d=5], e1);
2
(%o2) x - 100
(%i3) e3: solve(e2, x);
(%o3) [x = - 10, x = 10]
(%i4) %phi[1] : -x/(2*d);
x
(%o4) - ---
2 d
(%i5) %phi[2] : -x/(2*d);
x
(%o5) - ---
2 d
(%i6) subst([e3[1], d=5],%phi[1]);
(%o6) 1
(%i7) subst([e3[2], d=5],%phi[2]);
(%o7) - 1
Zbigniew