[gnuplot] 为什么这个式子画出来的是直线?

wuchuanren

plot \
-0.25*0.02*x/(1+x/400) title "theoretish" with lines linewidth 2, \
-1/4*0.02*x/(1+x/400) title "theoretish" with lines linewidth 2


:em11: 第一条是正确的，第二条沿x轴画了一条…………………………请问为什么?

Terminal的截图:

wu@UNIX ~/project/Bericht/current/EMTv4/Data/4.1.a.strom $ gnuplot

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        last modified Sep 2008
        System: Linux 2.6.28-gentoo-r1-wu-x64

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        Thomas Williams, Colin Kelley and many others

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Terminal type set to 'x11'
gnuplot> plot \
> -0.25*0.02*x/(1+x/400) title "theoretish" with lines linewidth 2, \
> -1/4*0.02*x/(1+x/400) title "theoretish" with lines linewidth 2
gnuplot>

wuchuanren

貌似是浮点的问题，
plot -1.0*1/4*0.02*x/(1+x/400) title "theoretish" with lines linewidth 2
就正常的

那个式子里有浮点数0.02，为何不按浮点数运算…………

忘江的水

我是路过的，支持下再走，都挺不容易的..

emmoblin

难道需要强制转换？