• ← ConjugateTranspose
• → Dot

Dimensions

WMA

Dimensions[expr]

returns a list of the dimensions of the expression expr.

A vector of length 3:

• • Dimensions[{a, b, c}]

A 3x2 matrix:

• • Dimensions[{{a, b}, {c, d}, {e, f}}]

Ragged arrays are not taken into account:

• • Dimensions[{{a, b}, {b, c}, {c, d, e}}]

The expression can have any head:

• • Dimensions[f[f[a, b, c]]]