"John D'Errico" <firstname.lastname@example.org> wrote in message <email@example.com>... > "meng yan" <firstname.lastname@example.org> wrote in message <email@example.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!