I'm glad you were able to figure it out.

Yes, if you exchange the x & y coordinates the new points are described by the inverse relation. For example, if the points are given by x-squared, exchanging x & y will yield the square-root function; if the points are from an exponential function, exchanging x & y will yield a logarithmic function.

"Education is what remains after one has forgotten everything he learned in school"

Albert Einstein

>>> R.Eddy <e6bwhiz <at> hotmail.com> 1/14/2008 8:20 AM >>>

Thank you both for your help. We figured it out. There were no negative

coordinates, but the first one was 0,0. So I removed it and all the trendlines

are now available. It fits a "power" function perfectly. Before I had you

help I tried reversing all the x and y coordinates. It fit the "Polynomial"

function perfectly. Is this true for all graph funtions? That one function

inherently has an opposite function when the coordinates are switched? Thanks,

still a math newbie.

-------------------------------------------------------------------------

Check out the new SourceForge.net Marketplace.

It's the best place to buy or sell services for

just about anything Open Source.

http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace_______________________________________________

Graph-support mailing list

Graph-support <at> lists.sourceforge.net

https://lists.sourceforge.net/lists/listinfo/graph-support

!SIG:478b8bfe229714533218895!