COMPVAR	Project selected components and compute the variance of the original signal they account for.
Usage:	>> [proj, variance] = compvar( rawdata, ica_act, winv, components);
Inputs:
rawdata	2D(channels x points) or 3D(channels x frames x trials) data array.
ica_act	2D(channels x points) or 3D(channels x frames x trials) ica activity array. It can also be a cell array with the sphere and the weight matrix { sphere weight } that will be used to recompute the ICA activity.
frames	number of points per epoch.
winv	inverse of (weights*sphere) matrices returned by the ica function. It represent the component distribution of activity across the electrodes.
components	array of components to project.
Outputs:
proj	projection of the components
variance	variance of the original signal that the selected components account for.
Author:	Arnaud Delorme, CNL / Salk Institute, 2001

See the matlab file compvar.m (may require other functions)

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