Topographic map with gradient vector

The fig shown below is an example for surface of apple with 224 points (14 x 16 with 5 mm spacing).

How do I get this figure with my own 100 points using Matlab to generate a plot of the surface using your measurements of z(x; y).

Answer 1

[Asad (Mehrzad) Khoddam]

You can look at this:

https://www.mathworks.com/help/matlab/creating_plots/display-quiver-plot-over-contour-plot.html

[SZ N]

I referred this link before but I am not getting the right plot like the one i posted in the question above.

I used this equation/code to generate but I have no idea how to get the above graph.

[Asad (Mehrzad) Khoddam]

The contour is for yhe given function. Do have 100 points as z? What is the range of x and y?

[SZ N]

Yes, I have 120 points for the base=x and height=y.

x= 0.1- 1.5

y= 0.5 - 4.5

[SZ N]

So I took an apple and cut into half from top to bottom. Then took one half an apple and cut into 12 slices with almost equal measurements (i.e, base and height) . Now with 120 data points I have to use Matlab to generate a plot of the surface using your measurements of z(x; y).

Instructions that was given:

The surface height is denoted by both the shaded regions and the contour

lines. These were plotted in Matlab using the surf and contour functions,

respectively. Note that to use these plotting tools, the Matlab function

meshgrid is used to generate matrices for the x- and y-dimensions. Note

that the shaded hue of surf can be adjusted using the `FaceAlpha' prop-

erty, and the standard grid lines applied may be removed (as shown) by

setting the `EdgeColor' property to `none'. Additionally, the line thick-

ness of the contour function may be adjusted by setting the `LineWidth'

property. Finally, the color bar shown on the right-hand-side of the gure

may enabled using the `colorbar' command.

[Asad (Mehrzad) Khoddam]

what is the dimensions of a, y, and z?

[SZ N]

what matlab function do i use to get this contour lines that I have shown above?

[Asad (Mehrzad) Khoddam]

a combination of meshgrid and contour