-5 5 setxrange
-7 5 setyrange
-5 5 setyrange
30 setxunit
gsave
masque
quadrillage
/f {
2 dict begin
/y exch def
/x exch def
%% x -2 x mul y mul add
#rpn# x - 2*x*y
end
} def
.5 setlinewidth
/arrowscale {.5 dup} def
.4 setgray
{f} .25 .25 .1 champvecteur
/arrowscale {.75 dup} def
.7 setlinewidth
noir
tracerepere
1 setlinewidth
%% on represente quelques solutions
-3 1 7 {
/i exch def
bleu
[{f} 1 i 4 div .1 euler] ligne
} for
grestore
#tex# $y' + 2xy = x$
0 -6 [2 dup] cctexlabel
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