set term pdf fontscale 0.5 size 3in,3in
outfile='rotating_field.pdf'
set output outfile
unset border
unset xtics
unset ytics
unset ztics

set parametric

 set samples 100000
set zrange [0:1]
set xrange [-1.0:1.0]; set yrange [-1.0:1.0]

set arrow from 0,0,0 to 0,0,1.4 ; set label 'z' at 0.05,0.05,1.1 
set arrow from 0,0,0 to 0,1,0 ; set label 'y' at 0,0.9,-0.05 
set arrow from 0,0,0 to 1.3,0,0 ; set label 'x' at 1.5,0,0 
set label at 0.05,0.05,-0.05 '0' 
#set xlabel 'x'; set ylabel 'y'; set zlabel 'z'
#set arrow from 0,0,-1 to 0,0,20; set label 'B_z' at 0.5,0.5,18 
theta = pi/4
radius = 1
set arrow from 0,0,0 to radius*cos(theta)+0.1,radius*sin(theta)+0.1, 1 lw 2
x1=-3*pi/8
x2=4*pi/8
set arrow from 0,0,0 to radius*cos(x1),radius*sin(x1), 1 lw 1 nohead
set arrow from 0,0,0 to radius*cos(x2),radius*sin(x2), 1 lw 1 nohead

set label at radius*cos(theta)/2-0.1,radius*sin(theta)/2-0.1, 0.55 'B'
t3=pi/4; delta =pi/20
#set arrow from radius*cos(t3),radius*sin(t3),1 to radius*cos(t3+delta),radius*sin(t3+delta),1 lt -1 lw 1 size 0.5,4,60
set arrow from radius*cos(t3+delta),radius*sin(t3+delta),1 to  radius*cos(t3),radius*sin(t3),1  lt -1 lw 1 size 0.5,4,60
set label at radius*cos(t3),radius*sin(t3),1.1 '{/Symbol w}'
#set arrow from 1,0,1 to 0.1,0.1, 1 lt 2
set view 70,110,1,1
set timestamp offset  2.0,1.8,-0.1 font ',8'
set label 'examples/example10/fixed_pitch/rotating_field.gnu' at  0.9,-1.4,-0.4 left font ',8' noenhance

splot [t=0:10] radius*cos(t), radius*sin(t), t/t not
print 'write '.outfile