How to get a constant multiplier of any matrix using same matrix ???
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Let A be the m x n matrix.
I need a matrix such that B = k.A or det(B) = k.det(A)
where k is defined as 1 < k < infinite . It can be both integer and non-integer.
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David Goodmanson
il 11 Mag 2019
per Walter's query, some matrices that are proportional to their inverse.
a) all 2x2 traceless matrices with nonzero determinant
b) rotation matrices by 180 degrees about an arbitrary axis
c) in the following example, to avoid numerical innacuracy (which turned out to be very small anyway) in taking the inverse,
% M*M = k*I --> M = k*inv(M) (assuming inverse exists)
M = [263 106 54 -196 -106
368 -87 12 -132 -112
286 -86 5 -254 86
274 118 -30 -267 -118
286 -86 204 -254 -113]
M*M
ans = 39601 0 0 0 0
0 39601 0 0 0
0 0 39601 0 0
0 0 0 39601 0
0 0 0 0 39601
.
Risposte (1)
Walter Roberson
il 11 Mag 2019
function B = generate_B(A)
maxval = realmax ./ max(abs(A(:)));
while true
k = typecast(randi([0 255], 1, 8, 'uint8'), 'double');
if isfinite(k) && abs(k) <= maxval; break; end
end
B = k * A;
end
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