HP Prime: Unexpected "poly1" after cross product

03042022, 07:18 AM
Post: #2




RE: HP Prime: Unexpected "poly1" after cross product
poly1[ is a delimiter for a list representing a univariate polynomial (with coefficients in decreasing order). If you add lists that have different sizes, then they can not be considered as vectors (at least in the same vector space), and addition will mean univariate polynomials addition.
Using poly1[ instead of [ as a list left delimiter is a way to disambiguate some operations like *, if you multiply [1,2]*[3,4] by default dot product is used and it returns a real, if you multiply poly1[1,2]*[3,4] polynomial multiplication will be used. 

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HP Prime: Unexpected "poly1" after cross product  RickyFlips  03032022, 10:57 PM
RE: HP Prime: Unexpected "poly1" after cross product  parisse  03042022 07:18 AM
RE: HP Prime: Unexpected "poly1" after cross product  RickyFlips  03042022, 07:05 PM

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