where am i going wrong? i get errors when i multiply the functions

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Emmanuel on 13 Mar 2014
Commented: Emmanuel on 13 Mar 2014
Plot the following function from t=1 to t=2, sin(2*pi*3*t)*sin(2*pi*15*t). Label both axes, and give the plot a title. so this is the code i wrote but i keep get error. i am new at using matlab. I would like to know what i am doing wrong.
t= (1:1.1,2); x= sin(2*pi*3*t) y= sin(2*pi*15*t) c= (x*y)

Answers (2)

nl2605 on 13 Mar 2014
for t = 1:2
x(t) = sin(2*pi*3*t);
y(t) = sin(2*pi*15*t);
c(t) = x(t).* y(t);
This should work
Emmanuel on 13 Mar 2014
thanks. that was quite helpful the coresponding plot matches my manually generated graph.

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Joseph Cheng
Joseph Cheng on 13 Mar 2014
couple of things with your line.
  1. for the t=1:1.1:2 are you attempting to get t=1 to 2 with increments of .1?if so it should look more like t=1:.1:2;
  2. you should have a ";" after each function execution or atleast a "," to separate what you are doing. if you don't it will try to execute
t= (1:.1:2); x= sin(2*pi*3*t);y= sin(2*pi*15*t);c= (x.*y) as one single command.
3. the c = (x*y) will also give an error when it gets that far due to the matrix multiplication dimension mismatch. you'll have to use the element-by-element multiplication ".*". See element-by-element multiplication finally your line should look like
t= (1:.1:2); x= sin(2*pi*3*t);y= sin(2*pi*15*t);c= (x.*y)

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