expm() products NaN as answer.
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I have the matrix
A=1.0 e 04*
1.3371 0.0000 0 0
0.0130 -0.0000 0 0
0.0000 0 -0.0001 0.0001
0.0000 0 -0.0001 0.0001
Only 0 is a real 0 and 0.0000 is because the number is too small to show at such a scale. The expm(A) gives NaN as ans. I thought it is because of the matrix is badly scaled. But it works fine for expm(-A). So, where the problem is and how can I get the right ans?
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