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Vector field: how to make arrows fine? (plot2d)

asked 2018-12-18 05:45:20 -0500

Jawaka gravatar image

I'm using the function arrow and I'm trying to have arrows fine like the one you can find on the wikipedia page of vector field, because the normal arrows in Sage are not enough fine for me. I looked at the manual and at the properties of arrows but I found nothing.

Thank you for any help :)

here is my code:

def champs_vecteur(f,L,n):
P = point((0,0))

for k in [-n..n]:
    for l in [-n..n]:
        i = L*k
        j = L*l
        (u,v) = f(i,j) 
        nor = sqrt(u*u+v*v)/L
        if nor != 0:
            u = u/nor
            v = v/nor
        P += arrow( (i-u/2,j-v/2) , (i+u/2,j+v/2) ,color="black", arrowsize=3,width=1)
show(P,aspect_ratio=1)

I use it like that

var('y')
h(x,y) = (-x-y,-y+x)
champs_vecteur(h,0.1,10)
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answered 2018-12-20 14:47:35 -0500

tmonteil gravatar image

If you change the arrowsize to 1.5, the picture looks close to what can be seen on wikipedia.

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Asked: 2018-12-18 05:45:20 -0500

Seen: 57 times

Last updated: Dec 20 '18