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SANDIPKUMAR ROYADHIKARI
关闭： MATLAB Answer Bot 2021-8-20
B=[1 2 3;4 1 2;2 5 3]
A(new)=A(old)+A(old)* B
res=norm(Anew)
until res=100000
How many numbers of iterations are required ?
You can initiate with A=[1; 1; 1]
Thank you.
Sandip

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Walter Roberson
Walter Roberson 2020-11-4
8.
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Walter Roberson
Walter Roberson 2020-11-4
The problem has no solution.
Your A is 3 x 1. Your B is 3 x 3. You have A*B which is (3 x 1) * (3 x 3) . But for the algebraic matrix multiplication operator * the second dimension of the first operand (A) must match the first dimension of the second operand (B), and since 1 does not match 3, the operation cannot proceed.
If you use A as a 1 x 3 vector, then after a small number of steps, the norm() is a lot past 100000. It never equals 100000 . Your B has no negatives so multiplying by B is always going to give a result larger than the original if the original is all positive, so taking further steps cannot eventually return down to the target.
Possibly there might be a solution with a different initial A.

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