calculate the gradient at a point

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bilal javed
bilal javed 2018-12-17
编辑： Walter Roberson 2018-12-22
I have a situation something like this
potential gradient field f (400*600)
[gx, gy] = gradient(f);
I have to find gradient at a point say (590,50). How can I calculate it?Untitled.png

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Walter Roberson
Walter Roberson 2018-12-17
[gx(590,50), gy(590,50)]
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Walter Roberson
Walter Roberson 2018-12-18
编辑：Walter Roberson 2018-12-22
x is a column number .y is a row number . Column 590 row 50 is gx(50,590) because rows are listed first in MATLAB as I explained earlier .
bilal javed
bilal javed 2018-12-22
Thank you Walter Roberson, it really worked

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Mark Sherstan
Mark Sherstan 2018-12-17
Refer to the post here.
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bilal javed
bilal javed 2018-12-17
Thank you!
but my case is little bit different, the matrix f has all numerical values

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