why are my graphs not publishing?

%% Problem 3

%Part a: Create a function called height that accepts time as an imput and

%returns the height of the rocket.

function h = height(t)

% HEIGHT Brief summary of this function.

%

% Detailed explanation of this function.

h = (-(5.4/2).*t.^2)+(130.*t)+450;

%%

%Part b: Plot height versus time for times from 0 to 30 seconds and

%incriment of 0.5 seconds

figure(1);

t=[0:0.5:30];

h=height(t);

plot(t,h);

title('Path of the rocket');

xlabel('Time');

ylabel('Height');

%%

%Part c: Find the time wen the rocket starts to fall back to the ground

t=[0:0.5:30];

h=height(t);

[h_max,time]=max(h);

T_hmax=t(time);

fprintf('The time at which the rocket starts fallins in %d sec \n',T_hmax);

The time at which the rocket starts fallins in 24 sec

end

%% Problem 4

%Part a: Create a function hanfle to the highet function

function height = height_handle(t)

% HEIGHT_HANDLE Brief summary of this function.

%

% Detailed explanation of this function.

height = (-(5.4/2).*t.^2)+(130.*t)+450;

%%

%Part b: Use height_handle as input to the fplot function, and crate a

%graph from 0-60 seconds

height=@(t)-(5.4/2).*t.^2+(130.*t)+450;

height =

function_handle with value:

@(t)-(5.4/2).*t.^2+(130.*t)+450;

figure(2)

fplot(height,[0,60])

title('Height vs. Time')

xlabel('Time')

ylabel('Height')

%%

%Use the fzero function to find the time when the rockt hits the ground

fzero(height,0);

ans =

-3.2431

end

%% Problem 5

%Create a function that crates a polygon with n mumber of sides.

function polygon()

% POLYGON Brief summary of this function.

%

% Detailed explanation of this function.

n=input('Enter the number of sides for the polygon:\n');

theta=[0:2.*pi/n:2*pi];

r=ones(1,length(theta));

polar(theta,r);

title('Polygon');

%Run the function

figure(3);

polygon

Enter the number of sides for the polygon:

3

figure(4);

polygon

Enter the number of sides for the polygon:

4

figure(5);

polygon

Enter the number of sides for the polygon:

5

figure(6);

polygon

Enter the number of sides for the polygon:

6

end

Answer 1

[Mitsu]

Firstly,

For problem 3 and problem 4, you can solve your issue by adding hold on after you define the figure.

So instead of

figure(1);
t=[0:0.5:30];
h=height(t);
plot(t,h);
title('Path of the rocket');
xlabel('Time');
ylabel('Height');

you could use

figure(1);
hold on;
t=[0:0.5:30];
h=height(t);
plot(t,h);
title('Path of the rocket');
xlabel('Time');
ylabel('Height');

or even better:

ha = axes('NextPlot','add');
t=[0:0.5:30];
h=height(t);
plot(ha,t,h);
title(ha,'Path of the rocket');
xlabel(ha,'Time');
ylabel(ha,'Height');

Secondly,

I am not sure how exactly you're calling these functions, but in Problem 3 there is a recursive call:

function h = height(t)
...
h=height(t);
...
end

that might break your computations. Maybe that is the problem you're actually asking about.