Eig(A) returns long fractional answer instead of a single number

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Tom Beekhuysen
Tom Beekhuysen 2020-7-19
回答： madhan ravi 2020-7-19
Eig(A) returns
(22/(9*(- 5/3 + (8623^(1/2)*1i)/27)^(1/3)) + ((8623^(1/2)*1i)/27 - 5/3)^(1/3) - 3)^(1/2)
instead of
-0.7462i
Is there a way to change it so decimal answers appear?

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回答（3 个）

Bhupendra Prajapati
You can use double(eig(A)).
Steven Lord
Steven Lord 2020-7-19
编辑：Steven Lord 2020-7-19
If the symbolic expression doesn't contain a symbolic variable and you're okay with approximating it in double precision, call double on it.
If it does contain a symbolic variable or your need a numeric approximation to higher than double precision, use the vpa function.
If you don't need to define A as a symbolic expression, define it as a double array and call eig on that numeric array.
madhan ravi
madhan ravi 2020-7-19
sympref('FloatingPointOutput',1) % run this once and you don’t have to call vpa() or double() every single time
doc sympref

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