       Mathematica plaintext output

• To: mathgroup at smc.vnet.net
• Subject: [mg107368] Mathematica plaintext output
• From: nevjernik <hajde.da at mijenjamo.planetu>
• Date: Thu, 11 Feb 2010 05:16:38 -0500 (EST)

```Maybe this is trivial one, but I don't know how to interpret output of
following:

In:
Eigenvalues[{{1, 2, 3}, {2, 6, 4}, {3, 4, 5}}]

Out:
{Root[12 + 12 #1 - 12 #1^2 + #1^3 &, 3],
Root[12 + 12 #1 - 12 #1^2 + #1^3 &, 2],
Root[12 + 12 #1 - 12 #1^2 + #1^3 &, 1]}

WolframAlpha gives reasonable solutions:

lambda_1 = 4+(6 2^(2/3))/(17+i sqrt(143))^(1/3)+(2 (17+i
sqrt(143)))^(1/3)
lambda_2 = 4-(3 2^(2/3) (1-i sqrt(3)))/(17+i sqrt(143))^(1/3)-((1+i
sqrt(3)) (17+i sqrt(143))^(1/3))/2^(2/3)
lambda_3 = 4-(3 2^(2/3) (1+i sqrt(3)))/(17+i sqrt(143))^(1/3)-((1-i
sqrt(3)) (17+i sqrt(143))^(1/3))/2^(2/3)

And below that, there is "mathematica plaintext output":

{Root[12 + 12 #1 - 12 #1^2 + #1^3 & , 3, 0], Root[12 + 12 #1 - 12 #1^2
+ #1^3 & , 2, 0], Root[12 + 12 #1 - 12 #1^2 + #1^3 & , 1, 0]}

Ok, it is obviously some plaintext output of result, but how one can
deal with it in mathematica?

Thanks

--
ne vesele mene bez vas
utakmice nedjeljom

```

• Prev by Date: Re: Upright \[Micro] in AxesLabel
• Next by Date: Rotating graphics problem