gradient issue for matlab

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ABDULLA RAHIL
ABDULLA RAHIL 2019-4-24
评论： ABDULLA RAHIL 2019-4-24
Hi
I am trying to use the gradient function to have dq/dv and dv /dq . The martix has one direction is q and one is v but without titles for each one. My matrix size is 47 rows and 2 column.

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KSSV
KSSV 2019-4-24
编辑：KSSV 2019-4-24
Let A be your 47X2 matrix.
q = A(:,1) ;
v = A(:,2) ;
dq_dv = diff(q)./diff(v) ; % dq/dv
dv_dq = diff(v)./diff(q) ; % dv/dq
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ABDULLA RAHIL
ABDULLA RAHIL 2019-4-24
Hi KSSV,
Thanks for your answer, is it possible by using the equations belwo
FX = gradient(F)
[FX,FY] = gradient(F)
[FX,FY,FZ,...,FN] = gradient(F)

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更多回答（1 个）

Image Analyst
Image Analyst 2019-4-24
If M is your matrix, have you tried imgradientxy()?
[gx, gy] = imgradientxy(M); % Requires Image Processing Toolbox.

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