> > <\body> 本模板的目的是方便大家使用Gnuplot绘制常用的平面直角坐标系的曲线： <\wide-tabular> || > |<\cell> |<\cell> >| <\session|gnuplot|default> <\unfolded-io> png]\ <|unfolded-io> % -width 0.27par \; plot sin(x) <|unfolded-io> |png>|0.27par|||> |<\cell> <\session|gnuplot|default> <\unfolded-io> png]\ <|unfolded-io> % -width 0.27par set xtics pi; set ytics 1 plot sin(x) <|unfolded-io> |png>|0.27par|||> |<\cell> <\session|gnuplot|default> <\unfolded-io> png]\ <|unfolded-io> % -width 0.27par set xtics pi; set ytics 1 plot [-pi:pi] sin(x) <|unfolded-io> |png>|0.27par|||> \; >| 第一行开头的语法是特殊语法，用于控制Gnuplot生成的图片在墨干中的大小 |<\cell> xtics和ytics用于控制横轴和纵轴的刻度 |<\cell> 在plot的同时设置横轴的范围 >| \; |<\cell> \; |<\cell> \; >| |<\cell> |<\cell> >| <\session|gnuplot|default> <\unfolded-io> png]\ <|unfolded-io> % -width 0.27par xmin=0; xmax=6.5 ymin=-1.2; ymax=1.2 xgap=pi; ygap=1 f(x)=sin(x); g(x)=cos(x) \; set xtics xgap set ytics ygap set xrange [xmin: xmax] set yrange [ymin: ymax] \; plot f(x), g(x) <|unfolded-io> |png>|0.27par|||> 右边，为了绘制教科书上常见的样式，第二部分做了如下改进： <\enumerate> 取消边框 设置过原点的坐标轴 设置横轴和纵轴的刻度 设置横轴和纵轴的箭头 设置横轴和纵轴的范围 大家只需要复制代码片段，更改第一部分的预设的值和函数，更改最后一部分的plot绘制命令即可。 |<\cell> <\session|gnuplot|default> <\unfolded-io> png]\ <|unfolded-io> % -width 0.27par xmin=-6.5; xmax=7 ymin=-1.2; ymax=1.2 xgap=pi; ygap= 0.5 f(x)=sin(x) g(x)=cos(x) \; unset border set zeroaxis linetype -1 linewidth 1.7 set xtics axis set ytics axis set xtics xgap set ytics ygap set arrow from xmin,0 to xmax,0 set arrow from 0,ymin to 0,ymax set xrange [xmin:xmax] set yrange [ymin:ymax] \; plot f(x),g(x) <|unfolded-io> |png>|0.27par|||> 右边，当我们将椭圆方程 |4>+|9>=1> 视为函数 =|4>+|9>-1> 时，这个函数在 =0> 时描述的就是椭圆的边界。通过绘制这个函数的等高线，并且只选择 =0> 这一特定的等高线，我们就可以得到椭圆的图形。 |<\cell> <\session|gnuplot|default> <\unfolded-io> png]\ <|unfolded-io> % -width 0.27par xmin=-3; xmax=3.5 ymin=-4; ymax=4.5 xgap=1; ygap=1 f(x,y)=x**2/4 + y**2/9 - 1 \ \ set contour base unset surface set view map set isosamples 100, 100 set cntrparam levels discrete 0 unset xtics unset ytics \; unset border set zeroaxis linetype -1 linewidth 2 set xtics axis set ytics axis set xtics xgap set ytics ygap set arrow from xmin,0 to xmax,0 set arrow from 0,ymin to 0,ymax set xrange [xmin:xmax] set yrange [ymin:ymax] \; splot f(x,y) <|unfolded-io> |png>|0.27par|||> >>> \; <\initial> <\collection> <\references> <\collection> > > > <\auxiliary> <\collection> <\associate|toc> |绘制sin(x) |.>>>>|> > |设定x轴和y轴的刻度的间隔 |.>>>>|> >