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interp — interpolation
[f0 [,f1 [,f2 [,f3]]]]=interp(xd,x,f,d)
given three vectors (x,f,d) defining a spline function (see splin) with fi=S(xi), di = S'(xi) this function evaluates S (resp. S', S'', S''') at xd(i).
| x | : vector of xi (x(1) < x(2) < ...) |
| f | : vector of S(xi) |
| d | : vector of S'(xi) |
| f0 | : vector [S(xd(1),S(xd(2)),S(xd(3)),...] |
| f(1 2 3) | : vector of first, second, third derivative of S at xd=[xd(1),xd(2),...] i.e. |
f1 = [S'(xd(1)),S'(xd(2)),...]
f2 = [S''(xd(1)),S''(xd(2)),...]
f0, f1, f2, f3 matrices have the same shape as xd. In versions 2.7 and earlier f1, f2, f3 were transposed.
| << interpln | intersect >> |