Interpolation problem for parametric curves

Hi everybody,

I need some help regarding the following problem. I'm starting from data captures which consist in N couples of vectors: (ai,bi), where i= 1:N. Each couple (ai,bi) is obtained for a specific value assumed by another parameter ti (where i=1:N) Is there a method, using simulink too (something like a lookup2d table), by which it's possible to enter with any couple of values (a, b) and exit with the interpolated parameter t?

I apologize for possible lack of clarity.

Thanks in advance for the help.