PROCEDURE: deriv_data, n1,n2 PURPOSE: Creates a tplot variable that is the derivative of a tplot variable. INPUT: n1 tplot variable names (strings) Keywords: newname = the name of the tplot variable in which output should be stored. This will produce an error if you use this option with globbing. nsmooth = If this keyword is set smoothing will be performed. The number you set this keyword equal to is the width of the smoothing to be applied to the data. It is the same as the width argument to the idl smooth procedure. To get an explanation of how this keyword works please see the idl documentation for the 'width' keyword to the idl 'smooth' procedure. suffix = the suffix to be applied to the input data. Use this if you want to call this procedure on multiple tplot variables simultaneously. replace = set this keyword if you want to replace the original variables with the new values display_object = Object reference to be passed to dprint for output. Examples: deriv_data,'thb_fgs_dsl' deriv_data,'th?_fgs_dsl',suffix='_fgsderiv' deriv_data,'thb_fgs_dsl thb_state_pos',nsmth=2 deriv_data,'thb_fgs_dsl',newname='fgs_derivd' deriv_data,'the_*',/replace $LastChangedBy: jimm $ $LastChangedDate: 2008-04-28 13:27:07 -0700 (Mon, 28 Apr 2008) $ $LastChangedRevision: 2851 $ $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/thmsoc/branches/tdas_4_00/idl/themis/common/thm_config.pro $