g=fir2long(g,Llong);
fir2long(g,Llong) will extend the FIR window g to a length Llong window by inserting zeros. Note that this is a slightly different behaviour than middlepad.
fir2long can also be used to extend a FIR window to a longer FIR window, for instance in order to satisfy the usual requirement that the window length should be divisible by the number of channels.
If the input to fir2long is a cell, fir2long will recurse into the cell array.