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,