How to handle symbolic polynomials?

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lorenzo donadio
lorenzo donadio 2016-11-8
回答： Walter Roberson 2016-11-8
Hi, im looking for a way to create a function that takes an integer (k) and a simple but large symbolic polynomial like this :
1+x²+x³+x⁴.......
and returns only the part of the polynomial with a degree lower or equal to the integer k, can this be done?
for example
p= (syms) 1+x²+x³+x⁴+x⁶+x⁹
return=function(p,5)
return= (syms) 1+x²+x³+x⁴

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Walter Roberson
Walter Roberson 2016-11-8
sym2poly(), take the last k+1 entries, poly2sym()
Or use coeffs('all') with two outputs, and take the last k+1 entries of the two outputs, dot product the two (that is, sum of the element-wise multiplications)

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