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Retrieve number of elements in object
# S4 method for gpuVector length(x)# S4 method for vclMatrix length(x)# S4 method for vclVector length(x)# S4 method for gpuMatrix length(x)
# S4 method for vclMatrix length(x)
# S4 method for vclVector length(x)
# S4 method for gpuMatrix length(x)
A gpuMatrix/vclMatrix object
A numeric value