Creating a sinusoidal graph

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Hami the Penguin
Hami the Penguin 2019-10-19
回答： Stephan 2019-10-19
Hello,
I have a homework to do using matlab, and it is asking me to create three lines:
thumbnail_image.png
It says to plot exactly two cycles of the lowest frequency, and this is what I did:
thumbnail_image (1).png
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.

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回答（1 个）

Stephan
Stephan 2019-10-19
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.

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