s = trapz(a,dim) : computes the integral of iData objects elements along given dimension
@iData/trapz function to compute the integral of the data set along a given dimension
trapz(a,dim) integrates 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. In this case, a second output argument holds the error bar.
If dim='radial', the integration is done radially (R=sqrt(sum(axes^2)).
trapz is complementary to sum and camproj, but takes into account axes.
trapz(a,'radial', center) specifies the 'center' of the integration
(vector of coordinates) or a single value used as center on all axes
(for instance 0). All axes are assumed to be distances.
input: a: object or array (iData/array of)
dim: dimension to integrate (int/array of, or 'radial')
output: s: integral of elements (iData/scalar)
ex: c=trapz(a);
Version: Aug. 22, 2017
See also iData, iData/cumsum, iData/camproj, iData/sum