Define polynomial function
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Published on 2012-11-14T04:32:46Z
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2012/11/14
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python
|python-2.7
How can I define a function - say, def polyToString(poly) - to return a string containing the polynomial poly in standard form?
For example: the polynomial represented by [-1, 2, -3, 4, -5] would be returned as:
"-5x**4 + 4x**3 -3x**2 + 2x**1 - 1x**0"
def polyToString(poly):
standard_form=''
n=len(poly) - 1
while n >=0:
if poly[n]>=0:
if n==len(poly)-1:
standard_form= standard_form + ' '+ str(poly[n]) + 'x**%d'%n
else:
standard_form= standard_form + ' + '+str(poly[n]) + 'x**%d'%n
else:
standard_form= standard_form + ' - ' + str(abs(poly[n])) + 'x**' + str(n)
n=n-1
return standard_form
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