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differentiation WRT a frab #69

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@RobinHankin

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@RobinHankin

thinking about the argument toderiv():

suppressMessages(library("mvp"))(p<- as.mvp("x^4*y*3*z^5"))#> mvp object algebraically equal to#> 3 x^4 y z^5deriv(p,c("x","x","y"))#> mvp object algebraically equal to#> 36 x^2 z^5aderiv(p,x=2,y=1)#> mvp object algebraically equal to#> 36 x^2 z^5

$\ldots$ but what we really want is to pass a named vector [here it would bec(x=2,y=1)], or, infinitely preferable, afrab object.

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