t=[0:0.01:0.98];y1=sin(2*pi*4*t)plot(t,y1)
gnuplot> set terminal aqua enhanced title "Figure 1" size 560 420 font "*,6" dashlength 1^line 0: unknown or ambiguous terminal type; type just 'set terminal' for a list
https://www.cnblogs.com/luntai/p/5841504.html