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Math - Differentiation and Integration

DERIV Performs differentiation using 3-point Langrangian interpolation.
DERIVSIG Computes standard deviation of derivative found by DERIV.
INT_2D Computes the double integral of a bivariate function.
INT_3D Computes the triple integral of a trivariate function.
INT_TABULATED Integrates a tabulated set of data.
LSODE Advances a solution to a system of ordinary differential equations one time-step H.
QROMB Evaluates integral over a closed interval.
QROMO Evaluates integral over an open interval.
QSIMP Evaluates integral using Simpson's rule.
RK4 Solves differential equations using fourth-order Runge-Kutta method.

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