I am looking for a graphing/plotting program that is capable of making a 3D and/or contour plots. I usually use xmgrace, but it cannot handle 3D plots. I have a file that contains a lot of x, y, z ...

plot "weather.dat" using 1:2 title "Temperature" If you want to get the pressure graph, you would use: plot "weather.dat" using 1:3 title "Pressure" If you want to plot all three columns, you can use: ...