sequence of color on a surf plot

I wanted a sequence of colour for my Z axis from min to max.

The plot is still plain black after the code below. How can i fix this?

surf(value)
colormap hsv

Answer 1

[John D'Errico]

Surf plots each grid line, as a BLACK line. The black lines are useful, and help you to see the shape of the surface for smaller grids. But they are a problem if you have too many lines. If you have a LARGE array to plot, then the black lines dominate what you see, and you see nothing but black. For example:

Z = rand(500,500);
surf(Z)

But we also can plot it without the grid lines.

surf(Z,'edgecolor','none')

[OLUWAFEMI AKINMOLAYAN]

What are the gridlines. Are they the highest values of Z?

[John D'Errico]

NO. Why would they be? Look at the examples in the help docs for surf. Or try a smaller example yourself.

Z = reshape(1:12,3,4)

Z = 3×4

1 4 7 10 2 5 8 11 3 6 9 12

surf(Z)
colormap pink

The black lines are now visible. As you can see, they connect the vertices in the lattice as drawn. Z was a 3x4 array.

mesh(Z)

The problem is when you have a huge surface, then the black lines dominate as I showed in my answer.

[OLUWAFEMI AKINMOLAYAN]

Thanks