5 replies to this topic

[epaloco]

Hi,I want to graph a Fourier Sum in order to compare it to the original function,so I could know that my Fourier coeficients are good.

Is it possible to graph both things in the same screen?

for example

(1/2)+Sum(1,+inf)(-1)^n * cos(2PiX) lets say I want to graph the first 100 terms? how could I do this?

Thanks very much,

Alejandro.

[betoe]

I want to make a program to makes the graphics in "discrete time" (only integers values, graph only dots in the right coordinate). Is it possible it on the AFX? I hope that somebody can help us with this...

[neo]

what calculator are u using? mine is afx2.0, i tried 2+1\3sin3x+1\5sin5x+...up to 1\17sin17x, then my calculator becoms very slow, so i don't think you can do up to 100 terms,

[epaloco]

I?ve a AFX 2.0

could you please tell me how did you enter the sum,I mean no problem in the amount of term,I mean with 10 terms its ok,but where do I write that?

thanks very much

=)

[ross8653]

epaloco #1: you can either set your graph screen to 0-100 with 1 interval, or the better thing to do is enter table mode (after going into graph) then you can see what each function looks like at specific points (it also works with 2-20 functions and derivatives)

betoe look into the stats section i know somewhere in there you can do this

neo you can do a sum as far as you want as long as you dont have an overflow, and yes it can take many min or so depending on the function

epaloco #2 [SUM]( FUNCTION,VARIABLE,START,END
i'm assuming you found the sigma (sum) button if not look for it go into "calc"
here's some examples
[SUM](X^2+5,X,1,10)
[SUM](sin X^2*Y+Z,X,0,5)

[betoe]

Oh thanks ross, i did not read this when you post it, also its really a way to make a program in casiobasic for the fourier sum (its only in my mind). PM or send me an email epaloco, both of us speak spanish.