Mathc initiation/a179
Installer ce fichier dans votre répertoire de travail.
G_Curve_2d |
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/* --------------------------------- */
/* save as kg_curv2d.h */
/* --------------------------------- */
void G_Curve_2d(
CTRL_splot p,
double (*P_f)(double t),
double (*P_g)(double t),
tvalue t
)
{
FILE *fp = fopen("a_main.plt","w");
fprintf(fp," reset\n"
" set size ratio -1\n"
" set zeroaxis lt 8\n"
" set grid\n\n"
" plot [%0.3f:%0.3f] [%0.3f:%0.3f]\\\n"
" \"a_curve\" with linespoints lt 6,\\\n"
" \"a_point\" with linesp lt 7 ps 3\n",
p.xmin,p.xmax,p.ymin,p.ymax);
fclose(fp);
fp = fopen("a_point","w");
fprintf(fp," %6.5f %6.5f \n",
(*P_f)(t.value),(*P_g)(t.value));
fclose(fp);
fp = fopen("a_curve","w");
for(t.value=t.min; t.value<t.max; t.value+=t.step)
fprintf(fp," %6.3f %6.3f\n",
(*P_f)(t.value),(*P_g)(t.value));
fclose(fp);
}
/* --------------------------------- */
/* --------------------------------- */
Le fichier a_main.plt :
reset
set size ratio -1
set zeroaxis lt 8
set grid
plot [-2.000:2.000] [-1.000:1.000]\
"a_curve" with linespoints lt 6,\
"a_point" with linesp lt 7 ps 3