It's related to that problem in another way. I'm getting a similar error to Zikobrelli did: "Error using VisibleTest1 (line 4)"
To fix the "Error using VisibleTest1 (line 4)", could you change your first line as "function b = blkavg(A,subsz)"?
*facepalm* Thank you. I feel like quite the idiot right now for not noticing that error.
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