Create matrix from predefined cells in Excel/VBA : Good afternoon,

i'm quite new to VBA and Excel and i'm having the following problem.
I have a function that requires a symetric matrix as input to calculate the eigenvalue [=MEigenvalueMax (A1: C3)]. However, I have the data for the matrix in different cells. My question is therefore whether there is a function with which I can define predefined cells as a matrix, e. g. =MEigenvalMax ({A1, A2, A3; B1, B2, B3; C1, C2, C3}).
Thank you for the answers! 