Solving the system with inexact coefficients

*To*: mathgroup at smc.vnet.net*Subject*: [mg99335] Solving the system with inexact coefficients*From*: Desana <incolaster at gmail.com>*Date*: Sun, 3 May 2009 05:20:50 -0400 (EDT)

Hello, this is my problem : I've got cca 40 sinusoidal waves ( e.g. 0.118149 Cos[25.1013 t]) and after superposition I get irregurar wave record. I'm trying to see how many waves I have in certain interval by finding how many zero crossings there are: Reduce[Total[Subscript[\[Eta], i]] == 0 && 0 < t < 60, t] but I couldn't because "Reduce was unable to solve the system with inexact coefficients" What's the problem? What does it mean? Can I find intersection between my wave and x-axis in any other wave? Perhaps graphically ? Thank you, student Desana