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Sinc function on TI89 
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#1
Sep2109, 04:29 PM

P: 44

how to graph sinc function on ti84
sinc(x) = sin(pi X) / pi X solution: sinc(x) = sin(pi X) / (pi X) yes it was that simple! 


#2
Sep2109, 05:53 PM

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#3
Sep2109, 07:04 PM

Sci Advisor
P: 4,016

You would have to read the book that came with the calculator.
But if you just wanted to see a graph of the right hand side of the equation try Wolfram Alpha: http://www57.wolframalpha.com/input/...i+X)+%2F(+pi+X) 


#4
Sep2109, 08:21 PM

P: 44

Sinc function on TI89
its not that it doesnt graph the function, but it graphs it backwards or something. From 0, it oscilllates with higher and higher amplitude to infinity and to negative infinity.
The highest oscillation is suppose to be at 1 when x=0 and oscillate down from x=0 to zero at x= infinity. 


#5
Sep2109, 08:40 PM

P: 1,636

check the x and y axis



#6
Sep2109, 09:12 PM

Sci Advisor
P: 4,016

Have a look at the graph on Wolfram Alpha. It does oscillate with decreasing amplitude as you describe.
I had to bracket the Pi X bit to ( Pi X) to get it accepting the X on the bottom line. Maybe your calculator is doing the same thing. Bringing the X to the top would give a rising amplitude. I just graphed the right hand side of the equation, otherwise it gave very peculiar squiggly lines. Try just graphing the right hand side of the equation. 


#7
Sep2109, 10:11 PM

P: 44

thankyouu veryy much to everyone for encouraging a solution in our communityyy here!! i hope to give back to your questions in the same way you've helped me... It was a super trivial solution which when dividing by pi*x, i had to put parenthesis!!! duhhh!! and u would think a senior in EE would know how to use his calculatorr!! LOL



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