s = cumtrapz(a,dim) : computes the cumulative product of iData objects elements
@iData/cumtrapz function to compute the cumulative integral (primitive) of the data set
cumtrapz(a,dim) operates along axis of rank dim. The axis is then removed.
default is to use dim=1. If dim=0, integration is done on all axes and
the total is returned as a scalar value.
cumtrapz is complementary to cumsum and camproj, but takes into account axes.
input: a: object or array (iData)
dim: dimension to integrate (int)
output: s: accumulated integral of elements, i.e. primitive (iData)
ex: c=cumtrapz(a);
Version: Aug. 22, 2017
See also iData, iData/plus, iData/sum, iData/prod, iData/cumsum