9.2.15 Grad sample

C++ code

mglData a(50,40);
a.Modify("0.6*sin(2*pi*x)*sin(3*pi*y) + 0.4*cos(3*pi*(x*y))");
gr->Box();  gr->Alpha(true);    gr->Dens(a);
gr->Grad(a);

MGL code

new a 50 40
modify a '0.6*sin(2*pi*x)*sin(3*pi*y) + 0.4*cos(3*pi*(x*y))'
box:alpha on:dens a
grad a

Pure C code

HMDT a = mgl_create_data_size(50,40,1);
mgl_data_modify(a,"0.6*sin(2*pi*x)*sin(3*pi*y) + 0.4*cos(3*pi*(x*y))",0);
mgl_box(gr,1);
mgl_set_alpha(gr,1);
mgl_dens(gr,a,0,0);
mgl_grad(gr,a,0,0);
mgl_delete_data(a);

Fortran code

integer a, mgl_create_data_size
a = mgl_create_data_size(50,40,1);
call mgl_data_modify(a,"0.6*sin(2*pi*x)*sin(3*pi*y) + 0.4*cos(3*pi*(x*y))",0);
call mgl_box(gr,1)
call mgl_set_alpha(gr,1)
call mgl_dens(gr,a,'',0)
call mgl_grad(gr,a,'',0)
call mgl_delete_data(a)

Python

a = mglData(50,40);
a.Modify("0.6*sin(2*pi*x)*sin(3*pi*y)+0.4*cos(3*pi*(x*y))");
gr.Box();   gr.Alpha(1);    gr.Dens(a);
gr.Colorbar();