makimamthd()

Read(235) Label: vector, interpolation,

Description:

Correct Akima piecewise cubic Hermite interpolation.

Syntax:

makimamthd(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 corrected Akima 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 one-dimensional sequence

Return value:

Sequence

Example:

 

A

 

1

=[30,32,35,38,48,58,68,78,98,108,128,159,201,252,308,401,501,602]

 

2

=[7.5,9.6,12,5,4,3,2,10,3,6,12,13,18,17,16,25,33,66]

 

3

=[31,33,34,37,45,55,65,75,85,95,115,146,179,189,233,305,423,600]

 

4

=makimamthd(A1,A2,A3)