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3 results for “from:Mark Novak”

Permanent of a matrix
Mark Novak · May 31, 2007 · r-help

Hello all, Does anyone know of a function for calculating the permanent of a matrix? I have found only the function for calculating a matrix's determinant, and my beginner attempts to figure out a working script (see below) have...

zoo:rollapply by multiple grouping factors
Mark Novak · Apr 4, 2011 · r-help

Thank you very much Gabor! It looks like that's gonna work wonderfully. I didn't even know 'ave' existed. For others out there: I only needed to add a comma: dat[,c("Site", "Plot", "Sp")] Small follow up Q...

zoo:rollapply by multiple grouping factors
Mark Novak · Apr 3, 2011 · r-help

# Hi there, # I am trying to apply a function over a moving-window for a large number of multivariate time-series that are grouped in a nested set of factors. I have spent a few days searching for solutions with...

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