Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Topic: help : how to reverse 2-D lookup table ?
Replies: 10   Last Post: Oct 30, 2013 5:54 AM

 Messages: [ Previous | Next ]
 meng yan Posts: 5 Registered: 1/29/10
Re: help : how to reverse 2-D lookup table ?
Posted: Jan 29, 2010 9:52 PM

"John D'Errico" <woodchips@rochester.rr.com> wrote in message <hk02rr\$d2\$1@fred.mathworks.com>...
> "meng yan" <anoucxy@163.com> wrote in message <hk0036\$c0k\$1@fred.mathworks.com>...
>

> > May be should use others means, the datas of T=T(a,b) are got by inner compute of matlab using Finit Element Analysis ,so I think it cann't simplly get a(a=a(T,b)), but there must have a means to do that . I aways try to use matlab's data process to achieve it ,but all have failed. Who have a good idears ?
> > meng yan

>
> It does not matter how this function has been obtained.
>
> If it does not have a simple, single valued behavior,
> then NOTHING can give you an inverse relationship.
> "Good ideas" are not sufficient to overcome a
> mathematical impossibility.
>
> And, if that relationship is a well behaved one then
> I'll be forced to repeat myself - it is then trivial to
> generate what you wish to see. A simple interpolation
> using interp1 will suffice to build your table.
>
> John

Thanks, John,I got you , it is impossible to got absolutely reverse ,I think i should try other ways. Thank you very much!

Date Subject Author
1/29/10 meng yan
1/29/10 John D'Errico
1/29/10 meng yan
1/29/10 John D'Errico
1/29/10 meng yan
1/29/10 ImageAnalyst
1/30/10 meng yan
1/30/10 ImageAnalyst
1/31/10 meng yan
1/31/10 ImageAnalyst
10/30/13 Virginia