** Cubic Interpolation of a 1-D function. **

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** YI=ICUBIC(Y,XI) returns the value of the 1-D function Y at the **

** points XI using cubic interpolation. length(YI)=length(XI). XI is **

** an index into the vector Y. Y is the value of the function **

** evaluated uniformly on a interval. If Y is a matrix, then **

** the interpolation is performed for each column of Y. **

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** If Y is of length N then XI must contain values between 1 and N. **

** The value NaN is returned if this is not the case. **

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** YI = ICUBIC(X,Y,XI) uses the vector X to specify the coordinates **

** of the underlying interval. X must be equally spaced and **

** monotonic. XI must lie within the coordinates in X. **

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