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5.29.24  Truncate of order n: truncate

truncate takes as argument, a polynomial and an integer n.
truncate truncates this polynomial at order n (removing all terms of order greater or equal to n+1).
truncate may be used to transform a series expansion into a polynomial or to compute a series expansion step by step.
Input:

truncate((1+x+x^2/2)^3,4)

Output:

(9*x^4+16*x^3+18*x^2+12*x+4)/4

Input:

truncate(series(sin(x)),4)

Output:

(-x^3-(-6)*x)/6

Note that the returned polynomial is normalized.


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