Le mardi 13 mars 2007 à 22:09 -0500, Arnaldo Leon a écrit : > Gnumeric is great, but I think I think it badly needs the following > (in order of importance):
Some work has been done on a time series analysis plugin which should solve 1 and 4. I just need some time to finish it (the original author has stopped working on it). > 1) a built-in linear/spline interpolation function. > > 2) 2-D interpolation (bi-linear and bi-cubic) > > 3) a transfer function/linear filter. This could work like > "=filter(numer,denom,data,time)" where "numer" and "denom" could point > to single cells or 1-D arrays and represent your transfer function, > "data" points to the data you want to filter, and "time" could be > either a time step or an array of time values. The output would be an > array of the same size as your input "data" (via CTRL-SHIFT-ENTER) > > 4) Fast-Fourier transforms! > > 5) eigenvalue and SVD matrix decompositions > > Interpolation and filtering is something engineers do all the time. I > think this could be a huge win for bringing in more engineers to use > gnumeric. I used to work for an aerospace company and you won't > believe the amount of stuff that gets designed solely on Excel. > > Also - I don't know if the number of data points on a plot is limited > (in Excel the max is 10,000), but it would be great if we could plot > millions of points on a chart, just like matlab can. in gnumeric, the only limit is the number of rows in the sheet. Millions of points might take some time to draw. > If you need a volunteer to code this stuff up, I might be able to find > some time :) You are welcome. You might meet the team on irc.gimp.org, channel #gnumeric, at north america daylight time. Cheers, Jean _______________________________________________ gnumeric-list mailing list [email protected] http://mail.gnome.org/mailman/listinfo/gnumeric-list
