returns true is method is the name of an affine time frequency representation.
flag = istfr2(method)
A character string.
An integer with 0 and 1 as possible values.
This function returns 1 if method has one of the following values (The case does not matter). 'TFRASPW', 'TFRSCALO', 'TFRDFLA', 'TFRSPAW', 'TFRUNTER', 'TFRBERT', 'TFRSPBK'.