ExpIntegralEi

Converts a number from one measurement system to another.

Converts a oil specific gravity to API gravity

Converts a API gravity to oil specific gravity (water=1.0)

Derivative for data samples at point t with smoothing.

Proximal (Nearest-neighbor) Interpolation Algorithm. Interpolate at point t.

A natural cubic spline with continuous second derivative in the interior and zero second derivative at the end points. Interpolate at point t.

A natural cubic spline with continuous second derivative in the interior and zero second derivative at the end points. Differentiate at point t.

A natural cubic spline with continuous second derivative in the interior and zero second derivative at the end points. Integrate up to point t.

A natural cubic spline with continuous second derivative in the interior and zero second derivative at the end points. Integrate from point t1 up to point t2.

x value of intersection point between two cubic splines.