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From: William on 27 Jul 2010 13:54
Hi, Im working on a projectile motion program.

%%

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,'-');

I would like to know how to limit my axes to where the flight begins (p), and when the functions Y value is at zero. Also, how would I go about pausing in between calculations to make it look more like an animation? thanks in advance.
From: us on 27 Jul 2010 14:03
On Jul 27, 7:54 pm, "William " <william.bax...(a)oit.edu> wrote:
> Hi, Im working on a projectile motion program.
>
> %%
>
> 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,'-');
>
> I would like to know how to limit my axes to where the flight begins (p), and when the functions Y value is at zero. Also, how would I go about pausing in between calculations to make it look more like an animation? thanks in advance.

one of the solutions

plot(1:10,'-rs');
set(gca,'xlim',[-10,20],'ylim',[-20,40]);

% and a hint for free...
help pause;

us
From: William on 27 Jul 2010 14:22
us <us(a)neurol.unizh.ch> wrote in message <b0030537-9cfe-4afa-acb6-7411a3f04a35(a)b5g2000vbl.googlegroups.com>...
> On Jul 27, 7:54 pm, "William " <william.bax...(a)oit.edu> wrote:
> > Hi, Im working on a projectile motion program.
> >
> > %%
> >
> > 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,'-');
> >
> > I would like to know how to limit my axes to where the flight begins (p), and when the functions Y value is at zero. Also, how would I go about pausing in between calculations to make it look more like an animation? thanks in advance.
>
> one of the solutions
>
> plot(1:10,'-rs');
> set(gca,'xlim',[-10,20],'ylim',[-20,40]);
>
> % and a hint for free...
> help pause;
>
> us




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.
From: us on 27 Jul 2010 14:34
"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
From: William on 27 Jul 2010 14:53
"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.
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