9.6.1 Legend sample

C++ code

mglData f(50,3);
f.Modify("sin(2*pi*x*x)",0);
f.Modify("sin(2*pi*x)",1);
f.Modify("sin(2*pi*sqrt(x))",2);
gr->Axis(mglPoint(0,-1),mglPoint(1,1));
gr->Box(); gr->Plot(f); gr->Axis();
gr->AddLegend("sin(\\pi {x^2})","b");
gr->AddLegend("sin(\\pi x)","g*");
gr->AddLegend("sin(\\pi \\sqrt{\\a x})","r+");
gr->Legend();

MGL code

new f 50 3
modify f 'sin(2*pi*x*x)'
modify f 'sin(2*pi*x)' 1
modify f 'sin(2*pi*sqrt(x))' 2
axis 0 -1 1 1
box
plot f
axis
addlegend 'sin(\pi {x^2})' 'b'
addlegend 'sin(\pi x)' 'g*'
addlegend 'sin(\pi \sqrt{\a x})' 'r+'
legend

Pure C code

HMDT f = mgl_create_data_size(50,3,1);
mgl_data_modify(f,"sin(2*pi*x*x)",0);
mgl_data_modify(f,"sin(2*pi*x)",1);
mgl_data_modify(f,"sin(2*pi*sqrt(x))",2);
mgl_set_axis(gr, 0.,-1.,0., 1.,1.,1., 0.,0.,0.);
mgl_box(gr,1);
mgl_plot(gr,f,NULL);
mgl_axis(gr,"xy");
mgl_add_legend(gr,"sin(\\pi {x^2})","b");
mgl_add_legend(gr,"sin(\\pi x)","g*");
mgl_add_legend(gr,"sin(\\pi \\sqrt{\\a x})","r+");
mgl_legend(gr,3,"rL",-1.,0.1);
mgl_delete_data(f);

Fortran code

integer f, mgl_create_data_size
f = mgl_create_data_size(50,3,1)
call mgl_data_modify(f,'sin(2*pi*x*x)',0)
call mgl_data_modify(f,'sin(2*pi*x)',1)
call mgl_data_modify(f,'sin(2*pi*sqrt(x))',2)
call mgl_set_axis(gr, 0.,-1.,0., 1.,1.,1., 0.,0.,0.)
call mgl_box(gr,1)
call mgl_plot(gr,f,'')
call mgl_axis(gr,'xy')
call mgl_add_legend(gr,'sin(\pi {x^2})','b');
call mgl_add_legend(gr,'sin(\pi x)','g*');
call mgl_add_legend(gr,'sin(\pi \sqrt{\a x})','r+');
call mgl_legend(gr,3,'rL',-1.,0.1);
call mgl_delete_data(f)

Python

f = mglData(50,3);
f.Modify("sin(2*pi*x*x)",0);    f.Modify("sin(2*pi*x)",1);      f.Modify("sin(2*pi*sqrt(x))",2);
gr.SetRanges(0,1,-1,1);     gr.Box();   gr.Axis();  gr.Plot(f);
gr.AddLegend("sin(\\pi x^2)","b");
gr.AddLegend("sin(\\pi x)","g*");
gr.AddLegend("sin(\\pi\\sqrt{\\a x})","r+");
gr.Legend();