If i understand it correctly, you can vary the scales parameter. Is that what you are looking for? 

@ Yee Siong Lee  ,

matlab uses cmor(x) = (pi*Fb)^{-0.5}*exp(2*i*pi*Fc*x)*exp(-(x^2)/Fb)   .

If I use cwt(x,scales,'cmor1-.45') then Fc corresponds to 0.45 Hz. But.I need to change Fb while using cwt command in matlab.

I think Yee is right. Wider the scale, wider will be you band-with in fact.

i have this problem too. could you please tell me, how we can change fb in cmor?

thanks

@ Yee Siong Lee,

 I am looking for how to change the scales parameter in morlet wavelet in matlab

matlab uses cmor(x) = (pi*Fb)^{-0.5}*exp(2*i*pi*Fc*x)*exp(-(x^2)/Fb) 

from this equation I don't know how to change the scales parameter.

Could you please tell me where the scales parameter correspond to the parameter in this equation

cmor1-0.45 means that 1 is your bandwidth parameter while 0.45 is centre frequency

Cmor-Fb-FC wavelet transform in matlab environment. Fb is bandwidth and Fc is center frequency parameters.

\Psi(t,f_c,T_p) = \frac{1}{\sqrt{\pi T_p}} \ e^{\frac{-t^2}{T_p}} \ e^{-j2 \pi f_ct}

How to get the best bandwidth parameters value for the function in question?