# Documentation

### This is machine translation

Translated by
Mouse over text to see original. Click the button below to return to the English verison of the page.

## Highlight Specific Contour Levels

This example shows how to highlight contours at particular levels.

Define `Z` as the matrix returned from the `peaks` function.

```Z = peaks(100); ```

Round the minimum and maximum data values in `Z` and store these values in `zmin` and `zmax`, respectively. Define `zlevs` as 40 values between `zmin` and `zmax`.

```zmin = floor(min(Z(:))); zmax = ceil(max(Z(:))); zinc = (zmax - zmin) / 40; zlevs = zmin:zinc:zmax; ```

Plot the contour lines.

```figure contour(Z,zlevs) ```

Define `zindex` as a vector of integer values between `zmin` and `zmax` indexed by 2.

```zindex = zmin:2:zmax; ```

Retain the previous contour plot. Create a second contour plot and use `zindex` to highlight contour lines at every other integer value. Set the line width to 2.

```hold on contour(Z,zindex,'LineWidth',2) hold off ```