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How to show exact answers in MATLAB

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Suh-Shin
Suh-Shin el 24 de Sept. de 2013
Editada: Mr.Gh el 14 de Dic. de 2019
Hello everyone, I run into this exact answer problem with MATLAB pretty frequently. My problem is right now when I'm trying to do an inverse of a matrix containing square roots, it gives me answers in fractions or in decimals. I want it to show the square roots and other functions. How would I go about doing this? I've googled a while and all they say are precision values and rounding and what not, but nothing to do with these square roots.
  2 comentarios
Karan Gill
Karan Gill el 14 de Nov. de 2017
As Walter answered, use
>> inv([sqrt(sym(21))])
ans =
21^(1/2)/21
Mr.Gh
Mr.Gh el 14 de Dic. de 2019
Editada: Mr.Gh el 14 de Dic. de 2019
Use this code to see the exact answer:
>>A = inv([sqrt(sym(21))]);
>>answer = double(A)
answer = 2.1822e-01

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Respuestas (3)

Mahdi
Mahdi el 24 de Sept. de 2013
Why don't you try an approach where you use square the matrix to find out what the numbers are?
For example
MatrixSquared=Matrix.^2;
Then you would be able to see which numbers were square rooted. I would also suggest placing
format rat
before the code.
  1 comentario
Suh-Shin
Suh-Shin el 24 de Sept. de 2013
Hey, I tried your approach, but it only gives me fractions. I want MATLAB to show me square roots and powers. I tried the following:
format rat;
inv([sqrt(21)]);
it shows me fractions, but I want to see square roots

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Matt J
Matt J el 24 de Sept. de 2013
Editada: Matt J el 24 de Sept. de 2013
Sounds like you're trying to do a symbolic matrix inverse operation. The Symbolic Math Toolbox will let you do that, see
  6 comentarios
Seetha Rama Raju Sanapala
Seetha Rama Raju Sanapala el 9 de Feb. de 2018
Great clarity, @ Walter Roberson! Thanks.
Karan Gill
Karan Gill el 13 de Feb. de 2018
To add onto Walter's reply, this topic explains differences in arithmetic.

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Shashank Prasanna
Shashank Prasanna el 24 de Sept. de 2013
Use format to reset your display format or choose a different display format:
>> format
  1 comentario
Suh-Shin
Suh-Shin el 24 de Sept. de 2013
format doesn't show the answer in square roots.

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