Why?

[zhao yacang]

 Sir ,

 I want to use CDIFF function to carry out vertical difference. But
 when I use the funtion CDIFF like:
 'define a=diff(u,z)'
 there occur errors like:

Operation Error:  Error from cdiff function
   Error ocurred at column 1
 DEFINE error:  Invalid expression.
 Error from CDIFF:  Specified dimension non varying
 Why?

 The function DIFF can not carry out vertical difference?

 Help me please!



Yours,
Zhang



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