How to plot two equations on two different plots

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RetiredCheetoXI
RetiredCheetoXI 2022-2-4
编辑： Arif Hoq 2022-2-4
I need to plot Altitude vs Time and Velocity vs Time. But there are two possible equations for each graph, depending on the value of "t". How do I get both of the correct equations to show up on two different graphs?
prompt = 'Time of flight? (s) ';
t = input(prompt)
if (t <= 45)
h = 15*t.^2;
fprintf('Altitude: %dm\n\n', h)
v = 30*t;
fprintf('Velocity: %dm/s\n\n', v);
plot(t, h), xlabel('Time (s)'), ylabel('Altitude (m)'), title('Altitude vs Time')
plot(t, v), xlabel('Time (s)'), ylabel('Velocity (m/s)'), title('Velocity vs Time')
elseif (t > 45)
h = 30375 + (1350*t) + 0.5*(-11.5)*t.^2;
fprintf('Altitude: %dm\n\n', h )
v = 1350 - 11.5*t;
fprintf('Velocity: %dm/s\n\n', v);
plot(t, h), xlabel('Time (s)'), ylabel('Altitude (m)'), title('Altitude vs Time')
plot(t, v), xlabel('Time (s)'), ylabel('Velocity (m/s)'), title('Velocity vs Time')
end

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回答（1 个）

Arif Hoq
Arif Hoq 2022-2-4
编辑：Arif Hoq 2022-2-4
try this code.
as your output is only a single integer so it's better specify Line style. here i used 'o'. for different plots use subplot.
prompt = 'Time of flight? (s) ';
t = input(prompt)
if (t <= 45)
h = 15*t.^2;
fprintf('Altitude: %dm\n\n', h)
v = 30*t;
fprintf('Velocity: %dm/s\n\n', v);
figure(1)
subplot(2,1,1)
plot(t, h,'o'), xlabel('Time (s)'), ylabel('Altitude (m)'), title('Altitude vs Time')
subplot(2,1,2)
plot(t, v,'o'), xlabel('Time (s)'), ylabel('Velocity (m/s)'), title('Velocity vs Time')
elseif (t > 45)
h = 30375 + (1350*t) + 0.5*(-11.5)*t.^2;
fprintf('Altitude: %dm\n\n', h )
v = 1350 - 11.5*t;
fprintf('Velocity: %dm/s\n\n', v);
figure(2)
subplot(2,1,1)
plot(t, h,'o'), xlabel('Time (s)'), ylabel('Altitude (m)'), title('Altitude vs Time')
subplot(2,1,2)
plot(t, v,'o'), xlabel('Time (s)'), ylabel('Velocity (m/s)'), title('Velocity vs Time')
end
  2 个评论
RetiredCheetoXI
RetiredCheetoXI 2022-2-4
Thanks! Do you know of any easy way to make it also display the equation used in addition to the point?
Arif Hoq
Arif Hoq 2022-2-4
编辑：Arif Hoq 2022-2-4
Follow this code:
prompt = 'Time of flight? (s) ';
t = input(prompt)
if t <= 45
h = 15*t.^2;
fprintf('Altitude: %dm\n\n', h)
v = 30*t;
fprintf('Velocity: %dm/s\n\n', v);
figure(1)
subplot(2,1,1)
plot(t, h,'o'), xlabel('Time (s)'), ylabel('Altitude (m)'), title('Altitude vs Time')
equation = sprintf('h = 15*t^2');
text(t, h, equation, 'FontSize', 12, 'Color', 'r','HorizontalAlignment','center','VerticalAlignment','top');
subplot(2,1,2)
plot(t, v,'o'), xlabel('Time (s)'), ylabel('Velocity (m/s)'), title('Velocity vs Time')
equation = sprintf('v = 30*t');
text(t, v, equation, 'FontSize', 12, 'Color', 'r', 'HorizontalAlignment','center','VerticalAlignment','top');
elseif t > 45
h = 30375 + (1350*t) + 0.5*(-11.5)*t.^2;
fprintf('Altitude: %dm\n\n', h )
v = 1350 - 11.5*t;
fprintf('Velocity: %dm/s\n\n', v);
figure(2)
subplot(2,1,1)
plot(t, h,'o'), xlabel('Time (s)'), ylabel('Altitude (m)'), title('Altitude vs Time')
equation = sprintf('h = 30375 + (1350*t) + 0.5*(-11.5)*t^2');
text(t, h, equation, 'FontSize', 12, 'Color', 'r', 'HorizontalAlignment','center','VerticalAlignment','top');
subplot(2,1,2)
plot(t, v,'o'), xlabel('Time (s)'), ylabel('Velocity (m/s)'), title('Velocity vs Time')
equation = sprintf('v = 1350 - 11.5*t');
text(t, v, equation, 'FontSize', 12, 'Color', 'r', 'HorizontalAlignment','center','VerticalAlignment','top');
end

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