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*Subject*: Re: Reverse interpolation?*From*: Simon de Vet <simon(at)mathstat.dal.ca>*Date*: Wed, 16 Aug 2000 11:50:43 -0400*Newsgroups*: comp.lang.idl-pvwave*Organization*: ISINet, Nova Scotia*References*: <399AAB76.2E547046@mathstat.dal.ca>*Xref*: news.doit.wisc.edu comp.lang.idl-pvwave:20891

Simon de Vet wrote: > I understand how to use a subscript to find an interpolated value. How > would I go in the opposite direction, using a value to find a subscript? I have an idea (I used this for a similar problem with Matlab) that may work. It's ackward and bulky, but I can understand it. First, I subtract the known altitude from the altitude list. Some of the values will be positive, and some negative. I use this to find the points on either side of known altitude. I can use their subscripts as x-values and their altitudes as y-values to find the equation of a line connecting the two points. I can then substitute my known altitude (y value) into the equation, and solve for x (the required subscript). I hope it works. Simon

**Follow-Ups**:**Re: Reverse interpolation?***From:*Pavel Romashkin

**References**:**Reverse interpolation?***From:*Simon de Vet

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