MATLAB Mathematics - SERC - Index of

1 Matrices and Linear Algebra
y = v*B
y =
12 -7 10
Rectangular matrix multiplications must satisfy the dimension compatibility
conditions:
C = fix(10*rand(3,2));
X = A*C
X =
17 19
31 41
51 70
Y = C*A
Error using ==> *
Inner matrix dimensions must agree.
Anything can be multiplied by a scalar:
s = 7;
w = s*v
w =
14 0 -7
The Identity Matrix
Generally accepted mathematical notation uses the capital letter I to denote
identity matrices, matrices of various sizes with ones on the main diagonal and
zeros elsewhere. These matrices have the property that AI = A and IA = A
whenever the dimensions are compatible. The original version of MATLAB
could not use I for this purpose because it did not distinguish between upper
and lowercase letters and i already served double duty as a subscript and as
the complex unit. So an English language pun was introduced. The function
eye(m,n)
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