Why doesn't the graph show?

%%ENGS103P
% Coursework 1
% 21 October, 2015
% Question 2(b)

A=0.009; % m
k=9800; % N/m
m=1; % kg
t=0,0.001,1;
x=A*cos(sqrt(k/m)*t); % m
plot(x,t)
grid on
xlabel('t')
ylabel('x')
title('Graph of x against t')

Answer 1

[aacarey]

t = 0,0.001,1; % The commas can be read kind of like "t has the values 0 and 0.001 and 1".

What you need to do instead is use colons

t = 0:0.001:1; % The colons can be read kind of like "t is all the values spanning 0 to 1 in increments of 0.001"

[dpb]

mmmm....I hate to let the cat out of the bag too easily on homework; would prefer the student find the issue themselves with a little a hint as possible. The learning experience tends to be enhanced that'a'way.

[Jessica Lee]

Thank you! I'm not very familiar with the functions of notations as I've just started learning MATLAB so that really helped :)

Answer 2

[dpb]

Check what your t actually is (instead of what you intend it to be)...