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

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Tom Beekhuysen
Tom Beekhuysen on 19 Jul 2020
Answered: madhan ravi on 19 Jul 2020
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
Is there a way to change it so decimal answers appear?

Answers (3)

Bhupendra Prajapati
Bhupendra Prajapati on 19 Jul 2020
You can use double(eig(A)).

Steven Lord
Steven Lord on 19 Jul 2020
Edited: Steven Lord on 19 Jul 2020
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 on 19 Jul 2020
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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