Why does fit(..., 'lowess') return zero?
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When using fit() to model a surface, I get a zero value at a seemingly random location. Why is this?
x = [-4, -3, -3, -3, -2, -1, -1, 0, 1, 2, 3, 3, 4]';
y = [0, -3, 1, 3, 0, -3, -1, 4, 1, -4, 1, 3, 0]';
z = [1.8449, 2.0116, 2.2877, 1.6313, 1.9229, 1.9516, 1.9282, 1.9436, 2.7744, 2.6486, 2.5890, 2.8023, 3.1996]';
fitType = 'lowess';
fitobject = fit([x, y], z, fitType);
fitobject(-0.9, 1.9) % Returns 2.1479
fitobject(-1, 2) % Returns 0?
fitobject(-1.1, 2.1) % Returns 2.1963
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