HP 48gII Graphing Calculator Manual do Utilizador descarregar pdf (Página 517)

The resulting graph is shown below for k = 5 (the number of elements in the

series is 2k+1, i.e., 11, in this case):

From the plot it is very difficult to distinguish the original function from the

Fourier series approximation. Using k = 2, or 5 terms in the series, shows not

so good a fitting:

The Fourier series can be used to generate a periodic triangular wave (or saw

tooth wave) by changing the horizontal axis range, for example, from –2 to 4.

The graph shown below uses k = 5:

Fourier series for a square wave

A square wave can be generated by using the function

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HP 48gII Graphing Calculator Manual do Utilizador Página 517