Khan Academy Static

The gradient is like the king of all partial derivatives. Or perhaps it's more like the country they all live it. It stores all partial derivative information in a single vector-valued function, and as such it is a central tool for analyzing rates of change in multivariable functions.

6662_Gradient.html

6663_Gradient_and_graphs.html

6667_Directional_derivatives_and_slope.html

6664_Gradient_and_contour_maps.html

6668_Why_the_gradient_is_the_direction_of_steepest_ascent.html

6666_Directional_derivative_formal_definition.html

6665_Directional_derivative.html