Graph Scale
in [Matlab]
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From: us on 27 Jul 2010 15:01 "William " <william.baxter(a)oit.edu> wrote in message <i2n9v4$5dh$1(a)fred.mathworks.com>... > "us " <us(a)neurol.unizh.ch> wrote in message <i2n8re$je3$1(a)fred.mathworks.com>... > > "William " > > > I think i get the idea behind it, but why isnt this working > > > > > > %% > > > h= t*V*cos(angle); %height > > > f= p+t*V*sin(angle) - 1/2*G*t.^2; %flight > > > plot(h,f,'-'); > > > set(gca,'xlim',[0,length(h)],'ylim',[0,length(h)]) %Graphical restrictions > > > > > > > > > % seems like this would allow the x and y axis to change restrictions based on the outcome of its respected x and y equation. > > > > hmm... > > - why do you use LENGTH(H)... > > - most CSSMers would probably use MAX(H)... > > > > just a thought... > > us > > > %% > h= t*V*cos(angle); %height > f= p+t*V*sin(angle) - 1/2*G*t.^2; %flight > plot(h,f,'-'); > set(gca,'xlim',[0,(max(h)/2)],'ylim',[0,(max(f)+5)])%Graphical restrictions > > > With this code I think its odd I need to divide max(h) by 2, and this still doesnt correctly resize my graph with some angles and velocity. The Y max works fine the x-axis is more difficult...I thought perhaps use length for the x values and max for the y, but that did not work either. rather - strange... can you give an example of your input, which shows the conundrum(?)... us
From: Andy on 27 Jul 2010 15:09 I'm not sure what the problem is, except that by setting the bottom of the ylim to 0, you're ignoring where f is negative. Perhaps you meant to trim this tail for both h and f?
From: William on 27 Jul 2010 15:22 angle = input('Enter angle of trajectory= '); %Angle V= input('Enter velocity= '); %Velocity p= input('Enter Position of elevation= '); %Position G= 9.8; %Gravity t=0:0.1:20; %# of Calculations %% h= t*V*cos(angle); %height f= p+t*V*sin(angle) - 1/2*G*t.^2; %flight plot(h,f,'-'); set(gca,'xlim',[0,length(h)/2],'ylim',[0,(max(f)+5)]) %Graphical restrictions % note the +5 in max(f)+5 is only to grow the graph slightly, for later annotation % space. Just about any input you can imagine doesnt allow the x format to work correctly, but here are some. angle = 45 velocity = 55 position = 10 or angle = 45 velocity = 155 position = 10
From: Alan B on 27 Jul 2010 15:32 "William " <william.baxter(a)oit.edu> wrote in message <i2nblf$rj8$1(a)fred.mathworks.com>... > angle = input('Enter angle of trajectory= '); %Angle > V= input('Enter velocity= '); %Velocity > p= input('Enter Position of elevation= '); %Position > G= 9.8; %Gravity > t=0:0.1:20; %# of Calculations > > %% > h= t*V*cos(angle); %height > f= p+t*V*sin(angle) - 1/2*G*t.^2; %flight > plot(h,f,'-'); > set(gca,'xlim',[0,length(h)/2],'ylim',[0,(max(f)+5)]) %Graphical restrictions > > % note the +5 in max(f)+5 is only to grow the graph slightly, for later annotation > % space. > > Just about any input you can imagine doesnt allow the x format to work correctly, but here are some... Maybe you should use max(h) WITHOUT dividing by 2? I don't know why you can't just use this very straightforward solution: set(gca,'xlim',[min(h), max(h)],'ylim',[min(f), max(f)]) %Graphical restrictions
From: us on 27 Jul 2010 15:36
"William " <william.baxter(a)oit.edu> wrote in message <i2nblf$rj8$1(a)fred.mathworks.com>... > angle = input('Enter angle of trajectory= '); %Angle > V= input('Enter velocity= '); %Velocity > p= input('Enter Position of elevation= '); %Position > G= 9.8; %Gravity > t=0:0.1:20; %# of Calculations > > %% > h= t*V*cos(angle); %height > f= p+t*V*sin(angle) - 1/2*G*t.^2; %flight > plot(h,f,'-'); > set(gca,'xlim',[0,length(h)/2],'ylim',[0,(max(f)+5)]) %Graphical restrictions > > % note the +5 in max(f)+5 is only to grow the graph slightly, for later annotation > % space. > > Just about any input you can imagine doesnt allow the x format to work correctly, but here are some. > > angle = 45 > velocity = 55 > position = 10 well... you're still using LENGTH()... why(?)... set(gca,'xlim',[0,length(h)/2],'ylim',[0,(max(f)+5)]) %Graphical restrictions using your input, then yrng=.1*(max(f)-min(f)); % <- +/- 10% for the eye... set(gca,'xlim',[0,max(h)],'ylim',[min(f)-yrng,max(f)+yrng]); % displays reasonably well... us |