Hello everone,
           Anyone who knows how to force a cubic smoothing spline to pass through a particular point?
           I found on website  someone said that we can use "cobs package" to force the spline pass through certain points or impose shape           constraints (increasing, decreasing). However,  this package is using  B-spline and can only do linear and quadratic B-spline.
           In my research, I need to force a cubic smoothing spline to pass a point. 
           Thanks!

          Victor

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