Re: 2 issues with Mathematica-data handling

*To*: mathgroup at smc.vnet.net*Subject*: [mg111889] Re: 2 issues with Mathematica-data handling*From*: "David Park" <djmpark at comcast.net>*Date*: Tue, 17 Aug 2010 01:21:29 -0400 (EDT)

1) More information is needed on the exact nature of the plot you want. And perhaps some sample data to work with (in the form of a list that we can paste into a notebook). If we have a data point {x,y} with an error e in the y value then the error limits will be y-e and y+e. But when you do a log transformation the limit points will no longer be evenly spaced about the Log[y]. How do you want this handled? Do you want a Log scale? On just the y axis? 2) Mathematica maintains about 16 place precision but only normally displays 6 places. You can display more places by using NumberForm. Calculations and plotting will automatically use the full precision. (I don't have much experience with Importing data and so I don't know if something happens there, but I doubt that it would truncate your numbers.) David Park djmpark at comcast.net http://home.comcast.net/~djmpark/ From: Debasish Banerjee [mailto:deb.ban.10 at gmail.com] Hi, I am currently having two problems with Numerical Data handling with Mathematica. I would appreciate any help in this regard. 1. I import a set of data along with the error-bars in Mathematica from a data-file. I can use ErrorListPlot to plot the data along with error-bars. But how do I plot the data with errors on a log-scale? I can, of course, calculate log and then plot, but is there an automatic command to do this? I couldn't find it on Help. 2. I have data points with, say 14 significant digits, after the decimal. But when I import this in Mathematica, this automatically truncates this to about 6 or 7 digits. How do I get around this? Thanks in advance, Debasish