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--- status: TODO
--- author(s): MES
--- notes:
document {
Key => {someTerms,(someTerms,RingElement,ZZ,ZZ)},
Headline => "select some terms of a polynomial",
Usage => "someTerms(f,i,n)",
Inputs => {
"f" => RingElement => "in a polynomial ring",
"i" => ZZ => "the starting index",
"n" => ZZ => "the number of terms to select"
},
Outputs => {
RingElement => {"the ", TT "n", " terms of the polynomial ", TT "f", " starting with the
", TT "i", "-th one"}
},
"The index i is 0-based, and a negative number refers to location from the end of the polynomial.",
EXAMPLE {
"R = ZZ[a..d];",
"f = (a+2*b-3)^2",
"someTerms(f,0,1) -- the lead term",
"someTerms(f,-1,1) -- the last term",
"someTerms(f,-2,2) -- the last 2 terms"
},
"Here is an example where the coefficient ring is also a polynomial ring.",
EXAMPLE {
"S = R[x,y,z];",
"f = (x*(a-b)+y^2+a-1)^2",
"someTerms(f,-1,1) -- the last term",
"someTerms(f,-2,2) -- the last 2 terms"
},
SeeAlso => {monomials, coefficients, terms, leadTerm}
}
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