plot function not giving any graphs?!

According to my code, there should be 4 graphs showing up but i only have one? Please clarify where the error is. Thanks!

[dpb]

The if statements aren't being satisfied owing to rounding of floating point values not being exact to the last bit for the various times...

Answer 1

[Ameer Hamza]

Because you are using if statements and only one statement can be true at a time. Remove if and write your code like this

subplot(2,2,1);
plot(x,gnp1);
xlabel('x(m)');
ylabel('Displacement(m)');
title('When t = 0.5 x Period');
hold on;

subplot(2,2,2);
plot(x,gnp1);
xlabel('x(m)');
ylabel('Displacement(m)');
title('When t = Period');
hold on;

subplot(2,2,3);
plot(x,gnp1);
xlabel('x(m)');
ylabel('Displacement(m)');
title('When t = 1.5 x Period');
hold on;

subplot(2,2,4);
plot(x,gnp1);
xlabel('x(m)');
ylabel('Displacement(m)');
title('When t = 2 x Period');
hold on;

All four graphs will be displayed.

[the cyclist]

I think you have both the issue mentioned in this answer, but also the one that dpb cites in his comment.

When you get to the point of your code where the plotting function are, t has a single value. So, at most only one of your conditional statements will be triggered. (It could be none of them, if the floating point comparison is not satisfied due to rounding.)

Were you expecting to have multiple values of t somehow, and different plots for different values? Because that is not what your code is doing.