Basics of MATLAB and Beyond

’String’,’0.5’,’Style’,’edit’,...’CallBack’,...’set(hsl,’’Value’’,str2num(get(hed,’’String’’)))’);The value from the edit box is transmitted to the slider when you pressreturn, tab, click outside the edit box, or move the mouse outside theGUI’s window. The slider’s callback must convert the slider’s value—a number—to a string before setting the edit box’s string property. Inprinciple the converse is not true. That is, the slider’s value property canbe passed directly to the edit box’s string property and the number willbe displayed automatically as a string. But we have included a numericalconversion using num2str(...,2) to limit the number of decimal placesof the displayed value to 2. (What happens when you type nonnumerictext into the edit box?)The default limits of a slider are set to a minimum of zero and amaximum of one. These can be changed via the slider’s min and maxproperties: the slider’s value property is scaled proportionally.ListboxListboxes let you choose from among a scrollable list of alternatives. Thelist of alternatives is set by the listbox’s string property. The optionsfor the format of the string are the same as for the axis tick labels (seepage 122); you can specify the alternatives in any of the following ways:set(h,’String’,{’Red’;’Green’;’Blue’})set(h,’String’,’Red|Green|Blue’)set(h,’String’,[1;10;100])set(h,’String’,1:3)set(h,’String’,[’Red ’;’Green’;’Blue ’])For example, to bring up a list of colour options:h = uicontrol(’pos’,[168 219 89 116], ...’Style’,’listbox’, ...’String’,{’Red’;’Green’;’Blue’});If the list is too wide or high for the listbox, matlab adds scroll sliders:c○ 2000 by CRC Press LLC