plotting the diffrence of a user define function from two data sets

[OMAR Akkou]

you should make variable1.1+ variable2.2 which means varible 1 of the
first file.ctl opened plus the variable 2 of the second file opened
                                        thanks


2007/7/31, Ilukpitiya Mudi S P Jayawardena <imspj at hawaii.edu>:
> Hi
>
> I need to plot the difference of a defined variable from two data sets. when
> I open the two ctl files of respective data sets and defined the function
> from 2nd data set as 'define x2=var1.2 + var2.2' a error shows. It mentioned
> as  'data request warning : request beyond file limits ' . but when I
> defined the function for 1st data, such as 'define x1=var1.1 + var2.1', it
> works.
>
>
> Please help me
>
> Thanks
>
> Ilukpitiya
>