Re: How to solve or approximate a first order differential equation ?

• To: mathgroup at smc.vnet.net
• Subject: [mg123232] Re: How to solve or approximate a first order differential equation ?
• From: Dino <dinodeblasio at gmail.com>
• Date: Mon, 28 Nov 2011 05:53:07 -0500 (EST)
• Delivered-to: l-mathgroup@mail-archive0.wolfram.com
• References: <jasv6s\$762\$1@smc.vnet.net>

```Hello and thanks for your reply,

I have a list like this(these are the first terms:
data = {{1.1795*10^-12, 0.}, {1.1795*10^-12, 0.000011918}, {1.,
0.0000276853}, {1., 0.000027194}, {1., 0.0000242474}, {1.,
0.0000267025}, {1., 0.0000281765}, {1., 0.0000276853}, {1.,
0.000031607}, {1., 0.0000276853}, {1., 0.000027194}, {2.,
0.0000262109}, {2., 0.0000232628}, {2., 0.0000379602}, {2.,
0.0000355202}, {2., 0.0000311167}, {2., 0.000035031}, {2.,
0.0000306263}, {2., 0.0000374716}, {2., 0.0000360052}, {3.,
0.0000306263}, {3., 0.0000203098}, {3., 0.0000355202}, {3.,
0.0000384486}, {3., 0.0000345417}, {3., 0.0000345417}, {3.,
0.0000237551}, {3., 0.0000252315}, {3., 0.0000257192}, {4.,
0.0000237551}, {4., 0.0000267025}}

and it gives me some errors. Is that possible to keep only a selected
amount of data, because it would be easier to work with a less amount
of data.
Furthermore the first terms {xi, ...} are repeated because there are
more measures for each second. How to keep only one value for each
{xi, ...} ?
In conclusion I would like to keep only for example 50 terms from the
list of data and make the model work as you showed.

Thanks,

```

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