Student Support Forum: 'How to plot a sine function, multivariable' topicStudent Support Forum > General > "How to plot a sine function, multivariable"
Author 
Comment/Response 
Eun S

02/15/12 11:33am
Hello, so I'm to plot two sine functions to show the orthogonality of the functions.
I am given the theorem that:
sin(j*pi*y/L) and sin(n*pi*y/L) are orthogonal functions in the range of 0<y<L as long as j!=n
I get the general concept of the idea, but I am also asked to graphically show their orthogonality.
I've tried setting the first function to sin(j*pi*y/L), second to sin(n*pi*y/L) and plot them on a graph..
To show their orthogonality relationship, I also plotted a third function that is the multiplication of the first and second functions.
Hence, if the third function: f1*f2 shows that its total area under the curve is zero, it should be orthogonal correct?
Well, for some reason, varying the j and n doesn't seem to have any effect on it, I can make j=n and the orthogonality should break at that point, but it still persists.
Can someone:
1. Confirm that I've got my equations correct
2. Take a look at my approach to proving orthogonality
Thank you
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