What I did now is that I checked the class of both matrix before assigning the first row of mat2: class(mainMat) --> "matrix" class(mainMat[1,]) --> "list" class(mat2) --> "matrix" mat2[1,]<-mainMat[1,] class(mat2) --> "list" I think the problem comes from mainMat[1,] that should be of class "matrix" but is of class "list"...
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