converter - Can gnuplot convert my temperature data on the fly? -

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i have column of numeric data temperature in fahrenheit. how can gnuplot display on y axis celsius? can gnuplot recalculate values me? can plot display temperature nicely in fahrenheit.

instead of 

plot 'temps.dat' using 1:2

i entered 

plot 'temps.dat' using 1:(($2-32)*.55)

and y-axis , values in celsius.


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