search for: assumning

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2006 Jan 13
1
first derivative of a time series
...of values, each line is a different time step ts.table <- read.table("timeseries.1d") ts.values <- ts.table[,1] ## first calculate coefficients to pass to coefDeriv ts.coef <- coefFit(ts.values) d.ts <- coefDeriv(ts.coef) ------- However, when I try to look at d.ts$y.deriv, assumning that this will plot the derivative I want, all the numbers are huge (on the order of e+02 to e+08) when my original time series ranged from 0 to 970. Am I going about this the wrong way? Or are there other tools that would lead me to estimating the derivative of a time series? Thanks in advance fo...
2006 Jul 29
9
export to a CSV or XLS file
hello everyone, Any idea how can i export a resultset from a database to a CSV or XLS file from the application ? would like the user to have the option to export selected data to a CSV/XLS file. Any plugins or libraries avaiable to accomplish this ? Thanks for your time, VASU. -- Posted via http://www.ruby-forum.com/.