Dear All,

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On Thu, 7 Apr 2016 17:30:52 +0200, Ricardo Buring <ricardo.buring@gmail.com> said: RB> Now, I would like to obtain the list [0, 0, RB> 0, 1, 1] from the above expression. RB> Could an accessor or some such be implemented RB> so this (basic) operation becomes possible?

I am attaching a patch which returns the list of indices of the partial derivatives as op(nops()-1). Best wishes, Vladimir -- Vladimir V. Kisil http://www.maths.leeds.ac.uk/~kisilv/ Book: Geometry of Mobius Transformations http://goo.gl/EaG2Vu Software: Geometry of cycles http://moebinv.sourceforge.net/