Contour lines on a imagesc plot

Hi,

I am plotting a imagesc with (x, y, Z). On top of that I would like to plot the contour lines with constant values of z. Could you please help me with it? Thanks a lot in advance.

Answer 1

[Star Strider]

There is not enough information in your Question to provide a definite Answer.

Two possibilities:

1. Use imagesc, hold, and contour;
2. Use the contourf (fills the contours) function only on (x,y,z).

[Auryn_]

Hi, thanks for your reply. In the resulting plot using imagesc i see the shaded plot of the variable z. Let's imagine that z is going from 0 to 100. I would like to see additional lines indicating where I have a specific and constant value of z (e.g. z=0.1, z=0.2..). Can you help me?

[Star Strider]

You can specify the contour line locations in contour and contourf:

contour(x, y, z, [0.1  0.2  0.3  0.4])

Extend the vector (or use the colon operator or linspace to create an equally-spaced vector) to as many contour lines as you want,at whatever level you want. Contour lines that are out-of-range will of course not be plotted, but they will not throw an error.

See the contour documentation for details.