Hello
Let us consider this piece of code
var('x,y')
px=(x,-1,1)
py=(y,-1,1)
def V(x,y) :
if (x2+y2 <1) :
return(x+y+(abs(1-x2-y2))(1/2))
else:
return(20)
W(x,y)=x+y+(abs(1-x2-y2))(1/2)
r=Graphics()
r+=contour_plot(W(x,y),px,py,contours=[1.70],fill=false,cmap=["red"])
r+=contour_plot(V(x,y),px,py,contours=[1.50],fill=false,cmap=["magenta"])
plot(r)
In 4.7, the level lines in magenta and red are displayed, but in 4.8 only the red one appears.
- is this change expected ?
- how to let sage knowing the definition of the V function ?
