Undefined function 'diff' for input arguments of type 'table'

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Dear Members,

I am facing following error when running my MATLAB code. Please advice the solution for this.

>> ind1=find( diff(daily_stk(:,2)) ~= 0 ); % row number
Undefined function 'diff' for input arguments of type 'table'.
 
daily_stk.Properties
 
ans = 
  TableProperties with properties:
                  Description    :     ''
                  UserData       :     []
          DimensionNames  :     {'Row'  'Variables'}
           VariableNames    :     {'yyyy'  'mm'  'dd'  'vwretd'}
    VariableDescriptions    :     {}
           VariableUnits        :     {}
      VariableContinuity    :     []
                RowNames    :     {}
        CustomProperties    :     No custom properties are set.
      Use addprop and rmprop to modify CustomProperties.