25 setxunit
7.5 setborder
90 setangle_repere
-3 3 setxrange
-1.5 2 setyrange
/quadrillagegray 0.4 def
.5 setquadrillagexstep
.5 setquadrillageystep
quadrillage
1 1 settkstep
.5 .5 setsubtkstep
1 1 setmkstep
ticks
subticks
marks
traceaxes
axesarrow
/f {setxvar
#rpn# x-((x+1)/4)*e^(-x))
} def
/g {setxvar
#rpn# x
} def
gsave
bleu
.75 setlinewidth
continu
{f} courbe
grestore
gsave
rouge
.75 setlinewidth
mixte
{g} courbe
grestore
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