Cubic Spline Calculators - Pipeng Toolbox

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Maths Cubic Spline

Calculate a cubic spline to fit the data points.

The cubic spline is calculated so that the slope and curvature match at each data point. The end points are assumed to have zero curvature. Extrapolated values should be used carefully.

For vector data calculators enter the data as X,Z pairs separated by a comma or tab, with each pair on a new line. Or copy and paste the data points from a spreadsheet. For array data calculators, enter the X and Z values as separate comma or tab separated lists. Use the data plot option on the plot b(u, m)ar to display the data points and the cubic spline.

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CALCULATOR : Cubic Spline Interpolation With Natural End Conditions (Vector Data) [FREE] ±

Calculate cubic spline interpolation with natural end conditions (zero bending moment at the end points) from vector data points.

Enter data as comma separated pairs (X,Z), with each pair on a new line (or copy and past cells from a spreadsheet).

Tool Input

OOR : Out Of Range Type
Xdata : X Data
Zdata : Z Data
X : X Input Value

Tool Output

Z : Z Output Value

CALCULATOR : Two Axis Linear Cubic Spline And Polynomial Interpolation (Vector Data) [FREE] ±

Calculate two axis bi-linear, bi-cubic spline, or bi-polynomial curve fitting to data points on a surface.

Enter the data (Z data) as comma separted rows, with each row on a new line (or copy and past cells from a spreadsheet). Enter the I row values (Idata) and J column values (Jdata) as comma separated lists. The value Zij is the Z value from the ith row and the jth column.

Tool Input

ntype : Number Of Polynomial Terms
oor : Out Of Range Type
optype : Surface Type
Zdata : Surface Data
X : X Input Value
Y : Y Input Value

Tool Output

Z : Z Output Value

Maths Cubic Spline

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