Glossary · Phase 2 · Math, when you need it
Gradient
The list of all the partial derivatives: it points in the direction that makes a result rise fastest.
Try it now
The purple arrow is −∇f, the steepest way down from the current point. Click to move the start and press Step: each step follows the arrow. Notice it doesn't point at the center. It points straight across the contours.
Learn it properly
Gradients · The vector of all partial derivatives: which way is uphill. About 25 minutes.
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