gnuplot也能画
set border 4095 front linetype -1 linewidth 1.000
set view 130, 10, 1, 1
set samples 50, 50
set isosamples 50, 50
unset surface
set title "set pm3d scansbackward: correctly looking surface"
set pm3d implicit at s
set pm3d scansbackward
splot sin(sqrt(x**2+y**2))/sqrt(x**2+y**2)
	
		
			
        
				
				
					
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