Quiver

plot the direction field for dy/dt=(y^2)-ty.

so heres my script:

[T,Y]= meshgrid (-2:.2:2 -2:.2:2); 
S= (Y.^2)-(T*Y); L= (??); 
quiver(T,Y, ??, ??, ??), axis tight  
xlabel 't', ylabel 'y'
title 'Direction Field for dy/dt=y^2-ty'

now, looking up help quiver, the example they used a gradient for the "L" and then used those value(s?) to plug into the third and fourth terms for "quiver". What do I do for the "??"s?

Answer 1

[Walter Roberson]

[FX, FY] = gradient(S);
quiver(T, Y, FX, FY);