2011-01-02 13 views

risposta

4

Sympy ha intervals, numeri razionali e infinito. La classe Intervallo è una sottoclasse della classe Set.

# oo is the symbol for infinity 
from sympy import Interval, oo, Rational 

i1 = Interval(10, 15) 
i2 = Interval(0, oo) 
i3 = Interval(-5, -1) 
# adding intervals 
i4 = i1 + i3 
i5 = i1 + i2 
# interval with open end 
i6 = Interval(Rational(1, 2), Rational(45, 3), left_open=True) 

print 11 in i1 # True 
print -1 in i1 # False 
print 0 in i4 # False 
print Rational(3, 2) in i6 # True 
print oo in i2 # False 
print i2.sup # oo (infinity) 
print Rational(1, 2) in i6 # False 
print i6.inf # 1/2