Flute acoustics: measurement, modelling and design - School of ...

APPENDIX B. PROGRAM LISTINGS 253
(starting at 0)
Returns:
A vector of Harmonic structs, one for each existent harmonic for
the particular Minimum in question.
*/
double harmAvgZ(Vector harmv);
/*
Calculates the weighted average of the impedance levels for the
first HARMONICS_AVERAGED number of harmonics in a given set. Each
harmonic in the vector contains its integer frequency ratio
(relative to an anonymous minimum), and its impedance level. An
integer ratio of 2 (the second harmonic) has a relative weight of
1/2. An integer ratio of 3 (the third harmonic) has a relative
weight of 1/3, and so on.
Parameters:
harmv: the vector of Harmonic structs for a particular minimum
Returns:
The weighted average of their impedance levels as a double
*/
double* harmonicsArray(Vector minv, int pos);
/*
Calculates the frequency ratios of minima following a particular
Minimum.
Parameters:
minv: the vector of Minimum structs for a particular data file
pos: the index of the required Mimimum struct in the vector
(starting at 0)
Returns:
An array of doubles, one for each minimum following the Minimum
in question. Each double is the frequency of the higher minima
divided by the frequency of the Minimum in question.
*/
double invalidNum(void);
/*
Gives the result of atof("+NAN").
Returns:
A double representing NaN.
*/
int isValidNum(double d);
/*
Evaluates whether a number is valid. NaN and inf values are invalid.
Parameters:
d: the double to evaluate
Returns:
1 if valid, 0 otherwise
*/
double det(double** M);
/*
Calculates the determinant of a 3x3 matrix.
Parameters:
M: a 2 dimensional double array representing the matrix.
Returns:
The determinant of M as a double.