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dewittpe / cpr

Control Polygon Reduction: Methods for quick and efficient placement of internal knots for B-splines and tensor products of B-splines.
http://www.peteredewitt.com/cpr/
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cnr needs an option to control which marginals will be considered for reduction. #16

Closed dewittpe closed 8 years ago

dewittpe commented 8 years ago

Default behavior should be that cnr looks for the smallest influence weighted knot from all marginals and removes that knot.

However, the user should be able to specify which marginals are to be considered for the reduction. Say a 3D tensor surface, built on x1, x2, and x3, is given and the user knows/wants to retain the knots specified for x2. cnr needs an option so that the algorithm will only run on x1 and x3.

Possible API: cnr(a_cpr_cn_object, margin = c(1, 3))