Chapter 4: Programming in Matlab - College of the Redwoods

Section 4.6 Nested Functions in Matlab 403
>> varScope2
In nestfun1, x equals: 3
Very interesting! No global variables, no passing of values as arguments, but
because nestfun1 is “nested” within the primary function, the nested function
nestfun1 has access to all variables assigned in the primary function.
Graphical User Interfaces
In this section we introduce our readers to Matlab’s GUI’s Graphical User Interfaces).
Matlab has a full complement of uicontrols (User Interface Controls),
typical of what you commonly see in most of today’s modern sofware: edit boxes,
popupmenus, push- and toggle-buttons, sliders, radio buttons, and checkboxes, a
few of which we will introduce in this section.
We’re going to write our first GUI, keeping it low-key as we introduce the
concepts. Our gui design can be described with the following series of tasks:
1. Plot a function.
2. Provide radio buttons to change the color of the graph of the function, offering
choices of red, green, or blue.
3. Provide a popup menu with choices of different line styles for the plot: solid,
dotted, etc.
4. Provide an edit box that allows the user to change the linewidth.
Let’s begin. Open the editor and enter the following lines, then save the
function M-file as plotGUI.m.
function plotGUI
close all
clc
% plot domain
xmin=0;
xmax=4*pi;
% some colors
figure_color=[0.8,0.9,0.8];
panel_color=[1,0.9,0.8];
buttongroup_color=[0.9,0.9,0.8];