| calc_phase_angle | calculate phase from mat_wt |
| calc_power | calculate wavelet power spectrum from mat_wt |
| date2nbDaysSinceEpid | Calculate number of days since start of epidemics |
| dist_param | Definition of the distance function used in optimisation |
| find_zeros_lin | plot real part of the wavelet decomposition |
| fit_seasonal | Fit yearly and bi-yearly sinusoids |
| mat_2_df | small function to format the matrix into a dataframe |
| mo | Definition of the Morlet wavelet |
| N_4 | Definition of the unit cubic B-spline (centered at x_0, width... |
| N_4_original | Definition of the cubic B-spline (cardinal B-spline of order... |
| N_4_unit | Definition of the unit cubic B-spline (centered at 0, width... |
| plot_re | plot real part of the wavelet decomposition |
| sp2df | Transforms a sp object into a dataframe to plot into ggplot |
| spline_optim | Function optimizing the timing, spread and amplitude of peak |
| trim_GBcode | remove '_cnt' or '_pref' from GBcodes |
| ts_power | plot real part of the wavelet decomposition |
| wt | Perform Morlet Wavelet transform |
| wt_extract | Extract components between 2 scales |
| wt_inverse | Reconstruct from wavelet transform |
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