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pchipmthd()
Description:
Piecewise cubic Hermite interpolating polynomial.
Syntax:
pchipmthd(x,y,newx)
Note:
x,y are a coordinate vector of an existing point, and newx is a query point vector. The function returns the interpolation vector corresponding to the query point specified by newx; the vector’s value is determined by x and y’s shape preserving piecewise cubic interpolation values.
Parameter requirements:
1. The range of newx must not exceed the original boundaries of x;
2. x should be strictly monotonic increasing, but no requirements for y; x and y should have same length;
3. Null values and infinite values are not allowed.
Parameter:
|
x/y/newx |
A matrix |
Return value:
Sequence
Example:
|
|
A |
|
|
1 |
=[1, 3, 4, 8, 12, 19, 40, 100] |
|
|
2 |
=[3, 10, 7, 15, 21, 19, 10, 30] |
|
|
3 |
=[2, 3, 4, 5, 6, 7, 10, 14, 16, 20, 30, 50, 60, 70, 80, 90, 100] |
|
|
4 |
=pchipmthd(A1,A2,A3) |
|
