programming in mathematica

*To*: mathgroup at smc.vnet.net*Subject*: [mg53798] programming in mathematica*From*: fonfastik at interia.pl (Paawel)*Date*: Thu, 27 Jan 2005 05:41:48 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

hello i want make a simple program in Mathematica which would consist of several commends: setdirectory, import file (ask for its name??), operations on provided data how can i do it? another thing is how to make Mathematice solve such equation: dx/dt=Const1*Exp[Const1*t] + (Const2 + Const3)*x and i want to write the equation in form as similar to above as possible (i mean i dont want to simplify it on my own) And the last thing - how to set min and max for the specified parameters in NonlinearFit? please help me if can thanks Pawel