Construct a 3×4 matrix A = [ajj] whose elements ajj are given by :
ajj = 2i
Let A = [aij]2×3
So, the elements in a 3×4 matrix are
a11, a12, a13, a14, a21, a22, a23,a24,a31,a32,a33,a34
A = ……(1)
a11 = 2×1 = 2 a12 = 2×1 = 2 a13 = 2×1 = 2 a14 = 2×1 = 2
a21 = 2×2 = 4 a22 = 2×2 = 4 a23 = 2×2 = 4 a24 = 2×2 = 4
a31 = 2×3 = 6 a32 = 2×3 = 6 a33 = 2×3 = 6 a34 = 2×3 = 6
So, from (1)
A =