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Posted on 2009-03-30

Totally new to Matlab here so your help would be greatly appreciated

I have done two related matlab programs below. one is a hyperbola and the other is the elipse. How can I get the two of these as just one .m program. I want the elipse to be in the middle of the hyperbola.

thanks in advance.

I have done two related matlab programs below. one is a hyperbola and the other is the elipse. How can I get the two of these as just one .m program. I want the elipse to be in the middle of the hyperbola.

thanks in advance.

```
% Program to plot the hyperbola
% y^2/a^2 - x^2/b^2 = 1
% The hyperbolae are open up/down, so that x is the independent variable
% for plotting. (Using the form x^2/a^2 - y^2/b^2 = 1 requires that y be
% the independent variable, which is awkward programming-wise.)
clear % all variables
figure(1), hold off % start a new figure
set(gca,'FontSize',14) % adjust fontsize
xmax = 30; ymax = 20;
x = linspace(-xmax,xmax,1001); % array of x values for plot (why 1001?)
a = 5; b = 3;
y=sqrt(((x.^2)./(b^2)+1).*a^2); % corresponding y values
plot(x,y)
hold on % add to current plot
plot(x,-y) % Plot other half of hyperbola
axis([-xmax xmax -ymax ymax]) % specify axis limits
xlabel('x')
ylabel('y')
title(['Hyperbola $y^2/a^2 - x^2/b^2 = 1$; $a$ = ', num2str(a), ...
', $b$ = ', num2str(b),'; (WR 1/21/08)'],'Interpreter','latex')
% Add axes
plot([0 0],[-ymax ymax],'k') % y axis (black line - k)
plot([-xmax xmax],[0 0],'k') % x axis
% Program to plot the elipse
% y^2/a^2 - x^2/b^2 = 1
clear
figure(1), hold off % start a new figure
set(gca,'FontSize',14) % adjust fontsize
xmax = 30; ymax = 20;
x = linspace(-xmax,xmax,1001); % array of x values for plot (why 1001?)
a = 5; b = 3;
y=sqrt(((-x.^2)./(b^2)+1).*a^2); % corresponding y values
plot(x,y)
hold on % add to current plot
plot(x,-y) % Plot other half of elipse
axis([-xmax xmax -ymax ymax]) % specify axis limits
xlabel('x')
ylabel('y')
title([elipse$y^2/a^2 + x^2/b^2 = 1$; $a$ = ', num2str(a), ...
', $b$ = ', num2str(b),'; (WR 1/21/08)'],'Interpreter','latex')
% Add axes
plot([0 0],[-ymax ymax],'k') % y axis (black line - k)
plot([-xmax xmax],[0 0],'k') % x axis
```

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