[R] Simple question on replace a matrix row

[anna]

Here is how I get mat1: I have a matrix mainMat of  4 rows and 8 columns, I
take the first row of it to build mat1. The problem might come from how I
build mainMat --> each column comes from an lapply function which returns a
list but I convert it to a matrix [4,1]...

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Anna Lippel
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