Determining stop band attenuation from FIR Filter properties?

Greetings!

I am trying to determine the Filter properties mostly stop band attenuation of a FIR Filter designed by the given coefficients stored in a row vector. To design the filter from the given coefficients, I am trying to use either 'dsp.FIRFilter' or 'dfilt.dffir'. I am not able to use the 'measure' command on the objects obtained.

Is there any other command (other than measure) using which I can extract the value of the stop band attenuation which I have to compare with a given value?

Thank you

[Saumya]

For example, if I try: b=fir1(10,0.4); h=dsp.FIRFilter('NumeratorSource','Property','Numerator',b);

h is the same object as created by the 'design' command but measure is responding to the h returned by dsp.FIRFilter while it does for 'design' returned object. In the help link, it is mentioned that 'measure' accepts filter objects from dsp.FIRFilter ???

Please help!

[Saumya]

Sorry for the typo: 'measure' is not responding to dsp.FIRFilter returned filter object