On 02/12/2013 06:23 PM, Jori Mantysalo wrote:
I'm writing about resolvents and want to show some numerical results,
kind of simulating hand-made calculations.
I can do this manually:
def n4(x): return x.n(digits=4);
f=x^4 - x^3 - 3*x^2 + x + 1;
map(n4, f.roots(ring = CC, multiplicities=false));
--> [-1.356, -0.4773, 0.7376, 2.095]
-1.356*0.7376+-0.4773*2.095
--> -2.00012910000000
However, if I say r[0]*r[2]+r[1]*r[3] I got exactly -2.000. This time
Sage is too good for me... Is there easy way to do this? There is CDF
and CC, but how to calculate and/or show results with given presicion?
Check these pages out:
http://www.sagemath.org/doc/reference/sage/rings/real_mpfr.html
http://www.sagemath.org/doc/reference/sage/rings/complex_number.html
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