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FFTMAG

Returns an array of magnitudes calculated by applying the FFT function to input values. FFTMAG is very useful in determining the natural frequencies of a data stream.

Format

FFTMAG (A, N)

Arguments

 
A
An array of real values.
N
An integer value which indicates the number output magnitudes. This must be greater than or equal to the number of input values. If N is an odd number, the function returns (N+1)/2 output values. If N is an even number, (N/2 + 1) number of values will be returned.

Example

The following example illustrates the use of the FFTMAG function:
 
Function
FFTMAG({0, 1, 4, 9, 16}, 5)
Result
12.0, 7.1968, 4.2197
Learn more about matrix/array functions.