Plotting the inverse of the numbers in columns in gnuplot with for loop

Question

I want to plot the inverse of the numbers in a number of columns against the first column:

plot for [i=1:30] 'file' using 1:(1/i) w lp

which results in all the y values to be zero. It works when I remove the for loop and just pick a column to plot: p 'file' u 1:(1/$4). What am I doing incorrectly?

Christoph · Accepted Answer · 2015-06-05 07:57:55Z

4

Inside the parentheses the i is only an integer number, and you get always zero. To access the value of a column inside an expression, use column(i):

plot for [i=1:30] 'file' using 1:(1/column(i)) w lp

The $4 is a shortcut for column(4). To understand this better, have a look at

i = 2
plot 'file' u 1:i, '' u 1:(i)

edited Jun 5, 2015 at 7:57

answered Jun 5, 2015 at 7:47

Christoph

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