.BG
.FN tfpct
.TL
Percentile frequency by frequency
.DN
Compute a percentile of time-frequency representation frequency 
by frequency.
.CS
tfpct(input, percent=0.8, plot=TRUE)
.RA
.AG input
time-frequency transform (output of "cwt" or "cgt").
.OA
.AG percent
percentile to be retained.
.AG plot
if set to T, displays the values of the energy as a 
function of the scale (or frequency).
.RT
1D array containing the noise estimate.
.SE
.DT
.SH REFERENCES
See discussions in the text of "Practical Time-Frequency Analysis".
.SA
"tfmean","tfvar".
.EX
