[Octave-bug-tracker] [bug #31733] error: ppval: expects a pp structure

[Rik]

Update of bug #31733 (project octave):

                  Status:                    None => Invalid                
             Open/Closed:                    Open => Closed                 

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Follow-up Comment #1:

Use 'help ppval' to get this


-- Function File: YI = ppval (PP, XI)
     Evaluate piece-wise polynomial PP at the points XI.


So, you need to reverse your argument list.

yy=ppval(p1,xx);


Matlab uses the same convention so I'm not sure what it was actually
calculating.  It would be better for Matlab to throw an error as well if the
function is not used correctly.

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