— Function File: pp = csape (x, y, cond, valc)

cubic spline interpolation with various end conditions. creates the pp-form of the cubic spline.

the following end conditions as given in cond are possible.

'complete'

match slopes at first and last point as given in valc

'not-a-knot'

third derivatives are continuous at the second and second last point

'periodic'

match first and second derivative of first and last point

'second'

match second derivative at first and last point as given in valc

'variational'

set second derivative at first and last point to zero (natural cubic spline)

See also: ppval, spline