How to sort elements from a two-dimensional list

• To: mathgroup at smc.vnet.net
• Subject: [mg123289] How to sort elements from a two-dimensional list
• From: Pippo <dinodeblasio at yahoo.it>
• Date: Wed, 30 Nov 2011 03:22:16 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com

```Hello,
I have a list as follows:
data={{1,0.0000317057}, {1,0.0000156821}, {1,0},{1, 00000234685},{1,0.000025413}, {1., 0.0000249271},{1, 0.0000210391}, {1.,0.0000181187},{1,0.0000210391},{2, 0.000025413}, {2.,0.000024441},{2,0.0000224955}, {2,0.0000239548}, {2,0.0000234685},{2,0.0000215261},{2,0.0000132381},{2,0.0000346042},{2,0.0000336413},{3,0.0000355749}, {3,0.0000302568},{3,0.0000297722},{3, 0.000025413}, {3,0.0000239548},{3,0.0000268658}, {3,0.0000239548}, {3,0.0000273512}, {3., 0.0000273512}, {3., 0.0000142161}, {4,0.0000190941}};

I'd like to know how to reduce the number of terms of the list to avoid the terms on the right side {xi,..} to be repeated.

Thanks,
Dino

```

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