How to insert a row to a matrix

["Shuxia Yu" <ysxzh@163.com>]

Dear all,

I hope to insert a row to a matrix, e.g., I hope to insert row 20 to a 35 by 40 
matrix. However, I cannot find a simple way.

Does anyone here like to give me some suggestions? Many thanks!

Best wishes,
Jinsong 

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