Creating a sinusoidal graph

Hello,

I have a homework to do using matlab, and it is asking me to create three lines:

It says to plot exactly two cycles of the lowest frequency, and this is what I did:

I randomly typed 100 numbers for the values of t, but and set the x axis length to 2 so that the red line with the lowest frequency would have exactly two cycles.

However, when I change the number of values for t, the number of waves change. The question doesn't say anything about the number of values for t. Maybe I am interpreting the question incorrectly. Can someone please help me understand this question?

Thank you.

Answer 1

[Stephan]

Note the frequency of your signals. Are 100 values really enough to display this frequency correctly? Hint: Think about something like sampling rate. Does the number of waves still change if you use asampling rate bigger then 2 times the frequency? I think These questions are answer enough if you think about it and make some expieriences with it.