Basics of MATLAB and Beyond

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pos2 = [scr_width/2 + edgethickness,...edgethickness,...figwidth,...figheight];pos3 = [scr_width/2 + edgethickness,...scr_height/2 + edgethickness,...figwidth,...figheight];figure(’Position’,pos1)figure(’Position’,pos2)figure(’Position’,pos3)The width of the window border might be different from these on yourcomputer. There is no way of obtaining these widths from within matlab.You might have to resort to trial and error to get the windowthicknesses exactly right for your computer.Exercise 15 (Page 118)Issue the command type gcf and you will see that if there are no figures,gcf creates one, whereas get(0,’CurrentFigure’) doesn’t.Exercise 16 (Page 119)Did you have fun?Exercise 17 (Page 123)The following commands should produce the required display. First wegenerate a grid of 100×100 points over the interval [0, 1]:N = 1 00;v = linspace(0,1,N);[x,y] = meshgrid(v);We want to draw a vertical line at each of the grid points to representthe vines of the vineyard or trees of the orchard. We string out the xand y grid points into two row vectors and use matrix multiplication toduplicate these. The z values, representing the start and end points, gofrom zero to a height of 0.01:x = [1; 1]*x(:)’;y = [1; 1]*y(:)’;z = [zeros(1,N^2); 0.01*ones(1,N^2)];plot3(x,y,z,’r’)c○ 2000 by CRC Press LLC
(The plot might take a few seconds to render; be patient.) We wantto modify this plot so that a perspective projection is used, and with aviewpoint as if we were standing near the edge of the vineyard:set(gca,’proj’,’per’)axis equalset(gca,’cameraposition’,[.5 -1 .2])axis vis3d offset(gca,’cameraposition’,[.5 -.1 0.03])Exercise 18 (Page 132)You should not use title instead of text because the title disappearswhen you do axis off.Exercise 19 (Page 145)The following code does the job. Items are “grayed out” by setting their“enable” property to “off”.uimenu(’Label’,’File’)uimenu(’Label’,’View’);E = uimenu(’Label’,’Edit’)uimenu(’Label’,’Options’)uimenu(E,’Label’,’Cut’,’Enable’,’off’)uimenu(E,’Label’,’Copy’,’Enable’,’off’)uimenu(E,’Label’,’Paste’)uimenu(E,’Label’,’Rotate’,’Separator’,’on’)S = uimenu(E,’Label’,’Scale’)uimenu(S,’Label’,’10%’,...’Enable’,’off’)uimenu(S,’Label’,’50%’,...’Enable’,’off’)uimenu(S,’Label’,’150%’,...’Enable’,’off’)uimenu(S,’Label’,’200%’,...’Enable’,’off’)uimenu(S,’Label’,...’Custom Scaling...’)Exercise 21 (Page 164)A truncated pyramid can be produced using the following code: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>
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t = {’help’ spiral(3) ; eye(2)
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meteo.Temperatureans =24ans =19.000
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3 >> a = [1 2 ;4 5 6;7 8 9]a =1 2 3
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[x,y] = meshgrid(1:5,1:3)x =1 2 3 4
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ans(:,:,2) =999And to sum over “p
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An Application of RGB ImagesTo see
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You can see that over the 8 time st
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name>> staff(2,1,2).name(5:9)ans =B
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q =7 8 96 1 25 4 3>> save saved_dat
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fid = fopen(’asc.dat’);The fope
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display and the enclosed area is th
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MarkerEdgeColor = auto(and so on)In
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text(-.7,f(-.7),’f(X)’)But we h
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plt(x,f(x/2),’--’)Let us try ca
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Example: findobjThe findobj command
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3. Add the property you want to set
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is numbered from top to bottom. The
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axis ijUsually images like this do
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32.2 Tick Marks and Labelsmatlab’
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clfaxes(’pos’,[.2 .1 .7 .4])x =
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property to [0 top] in the call to
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object’s HorizontalAlignment and
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the required symbols. The m-file ti
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1. Use graphical elements that serv
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uicontrol(’Callback’,’ezplot(
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uicontrol(’Pos’,[110 280 60 19]
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Page 157 and 158: 34.7 Fast DrawingFor fast drawing o
Page 159 and 160: controlled by guide and which are a
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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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Page 201: R = 1; N = 200;[x,y] = meshgrid(lin
Page 205: % Reproduce the layers at the diffe
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