Desperate due to NMinimize

*To*: mathgroup at smc.vnet.net*Subject*: [mg114637] Desperate due to NMinimize*From*: toxic topas <toxictopas at googlemail.com>*Date*: Sat, 11 Dec 2010 01:53:57 -0500 (EST)

I am working with Mathematica 7. I want to use NMinimize to find the minimum of a function that is calculated by an external program. It is called by Run with some arguments and it writes the result into a file. I then use Import to read the value. Such a situation can be mimicked by: dd[x_]:=(Export["test.dat",x^2];Import["test.dat"])[[1, 1]] NMinimize[dd[x],x] If you give the function dd a value it returns the result correctly (and writes a file). But NMinimize does not specify a value for x but tries to evaluate the expression generally for a global x. I tried everything that I could possibly think of using HoldAll, Unevaluated, With[{x=x},], ... Nothing worked. Is there anybody that can help me?