On Wed, Dec 17, 2003 at 07:47:22AM -0700, Paul E Condon wrote: > On Wed, Dec 17, 2003 at 01:57:22PM +0100, David Fokkema wrote: > > > > I was not entirely sure what to put in the subject line... > > Sorry I missed your original post. > > I did a very simple physics experiment involving two strings, two > > weights and one pulley. I'll spare you the details, but by varying one > > of the two masses, I measured the angle one of the strings made with the > > vertical. I got these results: > > > > # m2 alpha > > 0 0 > > 10 12 > > 20 23 > > 30 32 > > 15 18 > > 25 27 > > 12 14 > > 22 24 > > 27 29 > > 17 20 > > > > where the first column is the mass of the second weight and alpha is the > > angle, in which I made an error of ±1 degree. So far, so good. > > > > Now, I want to plot in gnuplot the following: m2 along the x-axis, but > > the tangent of alpha with errorbars along the y-axis. So, I have to > > process this data somewhat further to obtain a second data file with > > three columns: m2, tan alpha-low, tan alpha-high. > > Gnuplot itself can handle these things: I just copied your data into a file test.dat, ran gnuplot and issued this command:
gnuplot> plot "test.dat" using ($1):(tan($2)
Plots m2 vs tan(alpha). Play around these and you can do most of things
from within gnuplot itself.
Regards,
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