Can I plot a channel averaged TRF function rather than a single channel TRF function?

[ShuningTangg]

Describe the bug
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To Reproduce
Steps to reproduce the behavior:

1. Function name [e.g. mTRFtrain]
2. Input data size and type [e.g. stim=10×1 cell array (each cell=1000×10 matrix)]
3. Input data contains '...' [e.g. NaNs, Infs, complex numbers]
4. Additional parameter values [e.g. 'dim'=2]

Expected behavior
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Screenshots
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Desktop (please complete the following information):

• OS: [e.g. iOS]
• Software: [e.g. MATLAB]
• Version [e.g. R2019b]

Additional context
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