Gnuplot iteration and autorun

Question

I am a little new to gnuplot iteration . Its feature is geat, but I'm trying to find a good way to enter several titles into the plot.

My data is in the form;

 xdata data1 data2 data3 data4 1 1.1 2.2 3.3 4.4 2 0.1 1.1 2.2 3.3 3 4.2 5.2 6.4 3.7 

If i type

 set key autotitle columnhead plot "./mydata.txt" u 1:2 wl 

then gnuplot prints a graph with a headline, great!

But I want to build all the data on the same chart, so I type

 plot for [i=2:4] "./mydata.txt" u 1:(column(i)) wl 

This displays the data, but not the header.

Does anyone know a way to make these functions work together, or do I need to go back to the old way of entering each plot explicitly (That is)

 plot "./mydata.txt" u 1:2 wl, \ "./mydata.txt" u 1:3 wl, \ "./mydata.txt" u 1:4 wl 

Answer 1

I could not figure it out until I accidentally fooled with the syntax, this

 plot for [i=2:4] "./mydata.txt" u 1:iwl 

works.
I did not find a link to this behavior in the documentation, so this could be a problem with the message ...!?