この関数は Google スプレッドシートでも Excel と同じように機能します。構文も引数も同じです。
MMULT(array1, array2)The MMULT function calculates the product of two matrices. The number of columns in array1 must be equal to the number of rows in array2, and both arrays must contain only numbers.
=MMULT({1,2;3,4}, {5,6;7,8})結果: {19, 22; 43, 50}
Multiplies a 2x2 matrix by another 2x2 matrix.
This usually happens if the number of columns in the first array does not match the number of rows in the second array.