Make gnuplot column as a variable

Consider a case where there is a complicated manipulation of the columns which you wish to do before final plotting. The expression can be made into a variable

a = ‘column(4)/column(3)’
but this will not work if you just put the system as

pl … u 1:a ..

One needs to use this

pl[][] filename1 u 1:(@a) ..

 

courtesy:

https://stackoverflow.com/questions/19003717/gnuplot-using-a-string-variable-to-define-columns

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