How to get the exact value in final result

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eswarsakhamuri 2016-2-5

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https://ww2.mathworks.cn/matlabcentral/answers/266738-how-to-get-the-exact-value-in-final-result

回答： Walter Roberson 2016-2-8

How to get the exact value in final result, it's shows like (0.685577670878144 - 4.31922663726209e-253i)

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Walter Roberson 2016-2-5

And what calculation are you doing?

eswarsakhamuri 2016-2-8

I expecting the final result are 06855, 2.446369 like this. I calculate the eigenvalue.

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Answer 1

Walter Roberson 2016-2-8

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You will need to use the symbolic toolbox to get the exact result. You will need to pass exact inputs into the symbolic eig function, so you will need to determine what the exact value is that corresponds to each of your floating point inputs. For example is 1.23 exactly 123/100 or is 1.23 representing the range 1225/1000 inclusive to 1235/1000 exclusive? Only if you have exact inputs can you hope to get out an exact result.