Re: ListPlot with missing values

*To*: mathgroup at smc.vnet.net*Subject*: [mg22342] Re: ListPlot with missing values*From*: aram at sirius.com (Aram Schiffman)*Date*: Fri, 25 Feb 2000 21:13:36 -0500 (EST)*References*: <892pd1$pj6@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

>Does anyone have a Mathematica routine that behaves like ListPlot with >PlotJoined->True, where the data have missing values (given by a set >number, or if preferred by being out of range) and only joins >non-missing values. Assume the listis long (500-600 points) and there >may be quite a few (100-200) missing values. Such a routine wouldbe a >big help. > I'm not sure what constitutes a "missing value". I assume you mean x values with no corresponding y values. Here's one way, if I understand your question: =================== alist = {{1, 1}, {2, 3}, {4,}, {5, 6}, {7,}, {9, 12}} ListPlot[Complement[alist, Cases[alist, {x_, Null}]], PlotJoined -> True] =================== In this example, the missing values are just plain missing. If the missing y values are instead indicated by a particular value, substitute that value for "Null" above. The length of the list won't matter. Aram Schiffman '99 VFR800