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ses: Standard formula functions

 
 4.4 Standard formula functions
 ==============================
 
 Oftentimes you want a calculation to exclude the blank cells.  Here are
 some useful functions to call from your formulas:
 
 ‘(ses-delete-blanks &rest ARGS)’
      Returns a list from which all blank cells (value is either ‘nil’ or
      ’*skip*) have been deleted.
 
 ‘(ses+ &rest ARGS)’
      Sum of non-blank arguments.
 
 ‘(ses-average LIST)’
      Average of non-blank elements in LIST.  Here the list is passed as
      a single argument, since you’ll probably use it with ‘ses-range’.
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