Quiver

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John
John 2012-2-25
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?

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回答（1 个）

Walter Roberson
Walter Roberson 2012-2-25
[FX, FY] = gradient(S);
quiver(T, Y, FX, FY);

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