evalonly

Evaluate selected variables in a string.


Syntax
   F = evalonly(x, y, v2e, v2ne, expression)              %#ok

Description
   F = evalonly(x, y, v2e, v2ne, expression) evaluates part of an
   expression. Usefull for systems of odes.

Input
   x          = independent variable (itau object).
   y          = dependent variable (dtau object).
   v2e        = variables to evaluate (string)
   v2ne       = variables not to evaluate (cell of strings).
   expression = full espression for evaluation (string).

Output
   F          = part evaluated (dtau object with double matrix F.mat).