Basics of MATLAB and Beyond

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Callbacks are fastest when they are implemented as function calls;do not implement your callbacks as script m-files or as an eval of astring. The reason is that matlab compiles a function the first time itis encountered, whereas m-files and evals are interpreted line by line.The button-style uicontrols (pushbuttons, radiobuttons, and checkboxes)are used by simply clicking on them with the mouse. Othersneed more interaction: you must choose an item from a list (listboxes orpopupmenus) or specify a numeric value (sliders) or type in text (editboxes). We discuss briefly the operation of each of these different kindsof uicontrols.34.2 UIControlsEdit BoxesEdit boxes are designed to read in a piece of typed text. The text insidean Edit box is accessed via the box’s String property:h = uicontrol(’style’,’edit’,’String’,’Hello’);You can change it using the set command:set(h,’string’,’Bye’)or you can click in the box and change it by typing something else. Youcan access what has been typed into an edit box by getting its stringproperty. After typing qwe into the box you can type:>> get(h,’string’)ans =qweNumbers typed into edit boxes remain strings until you convert them tonumbers:>> x = get(h,’string’)x =10.3>> x+1ans =50 49 47 52>> str2num(x) + 1ans =11.3000TextGood GUIs have instructive text that indicates the function of a uicontrol.These can be placed with the text-style uicontrol. In the followingGUIthe “Name:”, “Address:”, and “Sex:” labels are three separateuicontrols of Text style.c○ 2000 by CRC Press LLC
uicontrol(’Pos’,[110 280 60 19],’Style’,’text’,’String’,’Name:’);uicontrol(’Pos’,[175 280 246 19],’Style’,’edit’);uicontrol(’Pos’,[110 262 60 19],’Style’,’text’,...’String’,’Address:’);uicontrol(’Pos’,[175 262 246 19],’Style’,’edit’);uicontrol(’Pos’,[110 243 60 19],’Style’,’text’,’String’,’Sex:’);uicontrol(’Pos’,[175 243 121 19],’Style’,’radiobutton’,...’String’,’Male’);uicontrol(’Pos’,[301 243 121 19],’Style’,’radiobutton’,...’String’,’Female’);FrameThe frame style uicontrol is not an object that is meant to be interactedwith. It is a decoration. For example, in the GUI in the previous sectionthe text labels stand apart from the uicontrols they refer to because thefigure color is not the same as the background colour. You can get amore integrated appearance by adding a frame:uicontrol(’Position’,[99 231 332 77],’Style’,’frame’);uicontrol(’Position’,[110 280 60 19],’Style’,’text’,...’String’,’Name:’);uicontrol(’Position’,[175 280 246 19],’Style’,’edit’);uicontrol(’Position’,[110 262 60 19],’Style’,’text’,...’String’,’Address:’);uicontrol(’Position’,[175 262 246 19],’Style’,’edit’);uicontrol(’Position’,[110 243 60 19],’Style’,’text’,...’String’,’Sex:’);uicontrol(’Position’,[175 243 121 19],’Style’,’radiobutton’,...’String’,’Male’);uicontrol(’Position’,[301 243 121 19],’Style’,’radiobutton’,...’String’,’Female’);You must issue the commands to draw the uicontrols over the frameafter you issue the frame command, otherwise the frame will obscurethe uicontrols. Some people like to divide their GUIs into sections usingframes. In this GUI are three frames:c○ 2000 by CRC Press LLC
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BASICS OFMATLAB®and Beyondc○ 200
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Library of Congress Cataloging-in-P
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typing pwd (print working directory
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ContentsIBasics of MATLAB1 First St
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20 Time-Frequency Analysis21 Line A
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39Answers to Exercises (Part I)40 A
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Set → Getting Started with MATLAB
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1.5 The Colon OperatorTo generate a
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matlab will recall the last command
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a = zeros(2,3)a =0 0 00 0 0>> b = o
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[a a(a)]ans =1 2 3 1 4 74 5 6 2 5 8
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a + bans =11 3344 6677 993.8 Transp
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4.2 Adding PlotsWhen you issue a pl
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x = [[1 2 3 4]’ [2 3 4 5]’ [3 4
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4.7 AxesSo far we have allowed matl
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v =1122>> v*uans =1 2 0 11 2 0 12 4
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max returns a vector containing the
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s = 100*spiral(3)s =700 800 900600
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We can plot the surface z as a func
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The contour function plots the cont
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m = gray(8);colormap(m)imagesc(1:10
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hold onplot3(x(ind),y(ind),z(ind),
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z = 5*ones(3,3)z =5 5 55 5 55 5 5>>
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contour(x,y,z,30);You may have noti
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variables that are local to themsel
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SwitchThe basic form of a switch st
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i =i =123136Vectorised Codematlab i
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9.1 MATLAB FormatTo save all the va
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11 StartupEach time you start matla
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Where p i is the population for yea
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NaNs by leaving them off the plot.
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clfpolar(t,gdb)In this case you mus
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-0.5000-0.3750-0.2500-0.125000.1250
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the periodograms of the blocks, and
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plot(y(1:1000))axis([0 1000 -5 5])z
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comet(x,y)(You can get a three-dime
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By clicking within the panner box a
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x = linspace(-1,1,8192);Fs = 1000;y
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23.3 Graphical Object Hierarchymatl
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Now we need to get the handles of a
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Beyond the BasicsPreludeThis part o
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clfgplot(A,[x y])axis off(Try zoomi
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str =you’re the one>> str = ’
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strrep(str,’go’,’am’)ans =I
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ans =3.14159e+100Some additional te
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eval(str)v =1 2 3 4 5The eval(str)
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Inline objects, like every other ma
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a(1,1) = {[1 2 3]}a =[1x3double]or>
Page 98 and 99: t = {’help’ spiral(3) ; eye(2)
Page 101 and 102: meteo.Temperatureans =24ans =19.000
Page 103 and 104: 3 >> a = [1 2 ;4 5 6;7 8 9]a =1 2 3
Page 105 and 106: [x,y] = meshgrid(1:5,1:3)x =1 2 3 4
Page 107 and 108: ans(:,:,2) =999And to sum over “p
Page 109 and 110: An Application of RGB ImagesTo see
Page 111 and 112: You can see that over the 8 time st
Page 113 and 114: name>> staff(2,1,2).name(5:9)ans =B
Page 115 and 116: q =7 8 96 1 25 4 3>> save saved_dat
Page 117 and 118: fid = fopen(’asc.dat’);The fope
Page 119 and 120: display and the enclosed area is th
Page 121 and 122: MarkerEdgeColor = auto(and so on)In
Page 123 and 124: text(-.7,f(-.7),’f(X)’)But we h
Page 125 and 126: plt(x,f(x/2),’--’)Let us try ca
Page 127 and 128: Example: findobjThe findobj command
Page 129 and 130: 3. Add the property you want to set
Page 131 and 132: is numbered from top to bottom. The
Page 133 and 134: axis ijUsually images like this do
Page 135 and 136: 32.2 Tick Marks and Labelsmatlab’
Page 137 and 138: clfaxes(’pos’,[.2 .1 .7 .4])x =
Page 139 and 140: property to [0 top] in the call to
Page 141 and 142: object’s HorizontalAlignment and
Page 143 and 144: the required symbols. The m-file ti
Page 145 and 146: 1. Use graphical elements that serv
Page 147: uicontrol(’Callback’,’ezplot(
Page 151 and 152: ’String’,’0.5’,’Style’,
Page 153 and 154: function exradio(action)if nargin =
Page 155 and 156: fail. One place to put variables th
Page 157 and 158: 34.7 Fast DrawingFor fast drawing o
Page 159 and 160: controlled by guide and which are a
Page 161 and 162: InvertHardcopy: [ {on} | off ]Paper
Page 163 and 164: Another option is to use an image f
Page 165 and 166: yur is the y coordinate of the uppe
Page 167 and 168: \end{center}\caption{This is the fi
Page 169 and 170: x 294x1 ...y 294x1 ...z 294x1 ...Gr
Page 171 and 172: diagram. Such a triangular grid can
Page 173 and 174: xt = x([1 9 10 1]);yt = y([1 9 10 1
Page 175 and 176: x = [0 0 .5 0.5 .5 1 11 .5 .5 .5];y
Page 177 and 178: fac2 = [1 2 61 6 31 4 61 6 5];The r
Page 179 and 180: t = linspace(0,2*pi,20);x = cos(t);
Page 181 and 182: N = 20;dt = 2*pi/N;t = 0:dt:(N-1)*d
Page 183 and 184: colouring of the sphere itself. To
Page 185 and 186: material dullThe default is materia
Page 187 and 188: time taken by this routine to calcu
Page 189 and 190: first row of a by taking the column
Page 191 and 192: 38.3 Debuggingmatlab has a suite of
Page 193 and 194: 10: y = linspace(ycentre - L,ycentr
Page 195 and 196: We change variables:p ′ = C + Bx.
Page 197 and 198: Exercise 6 (Page 59)You can generat
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33 ! 36 $ 39 ’ 42 * 45 - 48 034 "
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R = 1; N = 200;[x,y] = meshgrid(lin
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(The plot might take a few seconds
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% Reproduce the layers at the diffe
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