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Illustration Gradient of a Linear Scalar Function (Homogeneous Vector Field)

Gradient of a Linear Scalar Function (Homogeneous Vector Field)
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This is how the vector field \(\nabla \varphi \) (gradient) looks like in the range between \(x,y \in [0,1]\), where the scalar function \(\varphi\) is defined as follows:$$ \varphi(x,y) = x $$