Given an mvp object, replace one or more symbols with their reciprocals
mvp
invert(p, v)
Object (coerced to) mvp form
Character vector of symbols to be replaced with their reciprocal; missing interpreted as replace all symbols
Robin K. S. Hankin
subs
invert("x") (P <- as.mvp("1+a+6*a^2 -7*a*b")) invert(P,"a")
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