Chapter 4: Programming in Matlab - College of the Redwoods

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$Math 50A February 18, 2011 Quiz #10 Name: David Arnold ...$

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428 Chapter 4 Programming in Matlab Set the ‘Callback’ property of the edit box to the handle @plotFunction_Callback. In writing the callback plotFunction_Callback, you will have to vectorize the equation string before evaluating it with eval, setting all the *, /, and ^ to their “dot” equivalents. Matlab provides the vectorize command for this purpose. For example, try the following at the command prompt. >> str=’x^2*sin(x)/exp(x+1)’; >> vectorize(str) ans = x.^2.*sin(x)./exp(x+1) In the callback, you will want retrieve the string from the edit box, vectorize it, then evaluate the string on the domain [−10, 10] and store the result. You can then plot the resulting data. x=linspace(-10,10); eqnStr=get(hEditEquation,’String’); eqnStr=vectorize(eqnStr); y=eval(eqnStr); plot(x,y) A more sophisticated approach would be to create an empty line object in the primary function just prior to the callback. hLine=line; set(hLine,’XData’,[],’YData’,[]); Then, instead of using the plot command, you can update the data in the line object. set(hLine,’XData’,x,’YData’,y); 10. Following the hints given in Exercise 9, write a Matlab GUI that emulates the behavior of a graphing calculator. First, set up an axes object with the properties set as follows.
Section 4.6 Nested Functions in Matlab 429 i. Set both ‘XLim’ and ‘YLim’ properties to [−10, 10]. ii. Set both ‘XTick’ and ‘YTick’ properties to -10:2:10. iii. Set both ‘XGrid’ and ‘YGrid’ properties to ‘on’. Create three panels. One panel will hold an edit box where the user enters his equation, a second will hold edit boxes for the window parameters xmin, xmax, xscl, ymin, ymax, and yscl. You might also want to create an edit box in this second panel that contains the number of points to be plotted. Should a graph have a “jagged” appearance, increasing the number in this edit box would smoothen the graph. A third panel should contain a uicontrol that is a pushbutton. This pushbutton should have its ‘String’ property set to ‘Graph’ and ‘Callback’ property set to the handle @plotFunction_Callback. The design should allow the user to enter his equation, window parameters, and number of points. When the user clicks the pushbutton with his mouse, the callback function plotFunction_Callback will grab the window parameter data and adjust ‘Xlim’, ‘YLim’, ‘XTick’, and ‘YTick’ of the axes object accordingly. Then the user’s equation should be drawn over the domain [Xmin,Xmax]. This problem could potentially be expanded into a semester ending project, adding ‘Zoom’ menu or a ‘Calc’ menu for finding zeros and extrema. This project is very open-ended with lots of potential for further implementation of ideas and utilities.
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4 Programming In Matlab In this cha
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Section 4.1 Logical Arrays 261 4.1
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Section 4.1 Logical Arrays 263 >> A
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Section 4.3 Functions in Matlab 333
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Chapter 4: Programming in Matlab - College of the Redwoods

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