Question about TF analysis

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Hi~
    I want to know how to set the n_cycles and freqs with the command
*tfr_morlet*. when I set the *n_cycles=5, freqs=np.arange(1,21,1)*, there
is an error: *ValueError: At least one of the wavelets is longer than*
*the signal. Use a longer signal or shorter wavelets*. This is my first
experience doing TF analysis, wish you could give me some help. Thanks
a lot.

Tao Xia
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