# Newton's method in Maxima

I’m often surprised by maths teachers complaining, in blogs or online wholesale MLB jerseys postings, of the lack of a good freeware general purpose computer algebra system. In fact there are several. The topic of this posting is Maxima.
Maxima can do most things, and there is a small army of developers and users constantly extending and upgrading it. As a tiny introduction, here is Newton’s method, done interactively. Infinitesimals Maxima uses a singe colon for Куплю assigning a variable, and colon-equals for defining a function. First, the function:

`(%i1) f(x):=x^5+x^2-1;`

Next, Newton’s method applied to this function:

`(%i2) nr(t):=subst(t,x,x-f(x)/diff(f(x),x));`

Now, with a starting value of 0.7, we can start the iterations (as with Maple, Maxima uses the percentage sign to refer to the results of the previous command):

```(%i3) nr(0.7);
(%o3)           cheap MLB jerseys      0.8314862526437223
(%i4) nr(%);
(%o4)  wife?       cheap MLB jerseys           0.8095730086415593
(%i5) nr(%);
(%o5)              0.8087317874228543
(%i6) nr(%);
(%o6)              0.8087306004817508
(%i7) nr(%);
(%o7)              0.808730600479392
(%i8) nr(%);
(%o8)              &   0.808730600479392```

Easy!

## One thought on “Newton's method in Maxima”

1. Bill Zimmerly says:

Very cool!