Dear sage developpers.
When I used the command region_plot,
I met some trouble.
I report the trouble.
After
{{{
x, y = var('x y')
ex = (x>0)
ey = (y>0)
}}}
I tried the following
{{{
sxy = region_plot( ex or ey , (x,-5,5),(y,-5,5), incol='lightgreen',
bordercol='red', borderstyle='dashed')
syx = region_plot( ey or ex , (x,-5,5),(y,-5,5), incol='lightgreen',
bordercol='red', borderstyle='dashed')
sxy.show()
syx.show()
}}}
Then I obtained two different figures.
I am not sure that my usage of "or" is correct.
But both of them are not what I want.
The result of the following is what I want.
{{{
txy = region_plot(lambda x,y: x>0 or y>0 , (-5,5),(-5,5),
incol='lightgreen', bordercol='red', borderstyle='dashed')
txy.show()
}}}
I do not uderstand of the reason.
But I tried the following:
{{{
print ex
print ey
print (ex or ey)
print (ey or ex)
}}}
Then
the result is
x > 0
y > 0
y > 0
x > 0
They seem strange at least for me.
Moreover I also tried the following.
{{{
sx = region_plot( ex, (x,-5,5),(y,-5,5), incol='lightgreen',
bordercol='red', borderstyle='dashed')
sy = region_plot( ey, (x,-5,5),(y,-5,5), incol='lightgreen',
bordercol='red', borderstyle='dashed')
sxsy = sx+sy
sysx = sy+sx
sxsy.show()
sysx.show()
}}}
{{{
tx = region_plot(lambda x,y: x>0 , (-5,5),(-5,5), incol='lightgreen',
bordercol='red', borderstyle='dashed')
ty = region_plot(lambda x,y: y>0 , (-5,5),(-5,5), incol='lightgreen',
bordercol='red', borderstyle='dashed')
txty=tx+ty
tytx=ty+tx
txty.show()
tytx.show()
}}}
All of thier result are not what I want, neither.
But the main reason in this case may be outcol.
I used the default color for outcol,
and the alpha value of the color is 100%,
so I may obtain such figures.
But I am not sure.
Best,
Yasuhide NUMATA.
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