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5.10 OEGridHasNonZeroValue 

bool OEGridHasNonZeroValue(const OESystem::OEScalarGrid &g)
bool OEGridHasNonZeroValue(const OESystem::OESkewGrid &g)
Returns whether the data in the grid g is zerod out.

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C++ Programming Manual
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Documentation released on June 4, 2008.