# TDDD34 Programming with Applications in Engineering

### Figures, plots and graphs in Matlab

This document describes how to draw and plot in a separate figure window. The figure window frequently appear below other windows, be prepared to bring it to top manually.

### Functions and operators

plot Plots (graphically) data in a separate figure window. plot3 Plots in 3D. axis Configures range and relative scale of the axes in the figure window. hold Decide if the next plot should keep or clear the contents of the figure window. (By default new plots erases any previous plots.) clf Clears the figure window. figure Opens a new figure window and focuses it. figure(x) Moves focus to the existing window x. semilogx Plot with logarithmic scale on x axis. semilogy Plot with logarithmic scale on y axis. loglog Plot with logarithmic scale on both axes. grid Draws a grid in the figure window. imagesc Draws colored squares in the figure window based on the contents of a matrix.

A lot of more interesting and useful details can be said of the above commands. You can for example plot with different colors, lines and sizes. Be prepared to use Matlabs built-in help command (try "help help"). When you know how to use the built-in help, use it on all above commands to take a quick look on what you can do.

Page responsible: Erik Nilsson

Last updated: 2013-08-12