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tomaslibal/tangent_in_3d.m

Created November 5, 2015 22:49
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Tangent plane to f(x, y) in GNU Octave
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tangent_in_3d.m
#{
f = x^2 + yx^3 + 2y
tangent plane at (-1, 2, f(x, y)) is:
4x - 6y - z + 19
#}
tx = ty = linspace(-5, 5, 100);
[xx, yy] = meshgrid(tx, ty);
tz = (xx.^2) + (yy*xx.^3) + (2*yy);
meshc(tx, ty, tz);
hold on;
tangz = 4*xx - 6*yy - 19;
meshc(tx, ty, tangz);
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