Documentation of sum2

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Function Synopsis

[sx, nsum] = sum2 ( x ) ;

Help text

 function [sx, nsum] = sum2 ( x ) ;

  Similar to SUM, but ignores missing values (NaNs).
  Output also the number of the valid values summed, so 
    that an average can be calculated directly.
  
  See also: MEAN2

Cross-Reference Information

This function calls	This function is called by
zero_fillnan	corr_nan2 covar_nan3 mean2 myrunning_sum smooth

Listing of function sum2

function [sx, nsum] = sum2 ( x ) ;

  sx=sum(zero_fillnan(x));
  nsum=sum(~isnan(x));