MATLAB 中怎么求N维向量函数的梯度，求完怎么赋值？
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[FX,FY] = gradient(F) returns the numerical gradient of the
matrix F. FX corresponds to dF/dx, the differences in x (horizontal)
direction. FY corresponds to dF/dy, the differences in y (vertical)
direction.
When F is a vector, DF = gradient(F) is the 1-D gradient.
matrix F. FX corresponds to dF/dx, the differences in x (horizontal)
direction. FY corresponds to dF/dy, the differences in y (vertical)
direction.
When F is a vector, DF = gradient(F) is the 1-D gradient.
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