Symbolic math problem

symbolic-expression

asked 2015-01-11 18:18:01 +0100

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I need find in sage numberic value of expression like

s=cos(99.9500000000000*pi + 199.900000000000*pi*real_part(sgn(sin(49.9750000000000*pi))))*e^(-199.900000000000*pi*imag_part(sgn(sin(49.9750000000000*pi)))) + 1

but s.n() gives error "TypeError: cannot evaluate symbolic expression numerically". How to resolve this problem?

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answered 2015-01-11 18:36:53 +0100

slelievre
17704 ●22 ●160 ●350 http://carva.org/samue...

updated 2015-01-11 18:38:23 +0100

Use RDF.pi() instead of pi.

sage: pi = RDF.pi()
sage: s = cos(99.9500000000000*pi + 199.900000000000*pi*real_part(sgn(sin(49.9750000000000*pi))))*e^(-199.900000000000*pi*imag_part(sgn(sin(49.9750000000000*pi)))) + 1
sage: s
1.98768834059514

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Thanks. Now it works

gmind ( 2015-01-11 18:44:49 +0100 )edit

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Asked: 2015-01-11 18:18:01 +0100

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Last updated: Jan 11 '15

Symbolic math problem edit

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