The horizontal key displays in vertical in GNUPLOT

Question

In gnuplot, I used the horizontal key, but it shows me vertical on the output screen. I tried every alternative but found difficult to do that.

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Answer 1

You can force the legend to consist of a single row by specifying set key vertical maxrows 1:

set xlabel "X-Axis"
set ylabel "Y-Axis"
set multiplot layout 2,3
set key at screen 0.5, 0.40 center vertical height 1 box maxrows 1
set title "1st"
set xrange [0:20]
plot    tan((pi/180)*x)   title "Analytical"   w l  ls 1,\
    tan(2*(pi/180)*x) title "Observed"     w lp ls 2,\
    tan(3*(pi/180)*x) title "Experimental" w lp ls 3

set title "2nd"
set xrange [0:20]
plot    tan((pi/180)*x)   title "Analytical"   w l  ls 1,\
    tan(2*(pi/180)*x) title "Observed"     w lp ls 2,\
    tan(3*(pi/180)*x) title "Experimental" w lp ls 3

set title "3rd"
set xrange [0:20]
plot    tan((pi/180)*x)   title "Analytical"   w l  ls 1,\
    tan(2*(pi/180)*x) title "Observed"     w lp ls 2,\
    tan(3*(pi/180)*x) title "Experimental" w lp ls 3

unset multiplot