Numerically evaluate a triple integral. The function over with to integrate is defined by f, and the interval for the integration is defined by
[
xa,
xb,
ya,
yb,
za,
zb]
. The function f must accept a vector x and a scalar y, and return a vector of the same length as x.If defined, tol defines the absolute tolerance to which to which to integrate each sub-integral.
Additional arguments, are passed directly to f. To use the default value for tol one may pass an empty matrix.