Re: if I open multiple files in Mathematica

*To*: mathgroup at smc.vnet.net*Subject*: [mg64155] Re: [mg64124] if I open multiple files in Mathematica*From*: Murray Eisenberg <murray at math.umass.edu>*Date*: Thu, 2 Feb 2006 19:09:07 -0500 (EST)*Organization*: Mathematics & Statistics, Univ. of Mass./Amherst*References*: <200602020505.AAA16055@smc.vnet.net>*Reply-to*: murray at math.umass.edu*Sender*: owner-wri-mathgroup at wolfram.com

As you have discovered, definitions (rules) are associated with a Mathematica session and NOT with a Mathematica notebook. One work-around is to have use a different Mathematica Context for each notebook. A context is essentially a "namespace". See the Mathematica Book's materials for details. Here's a simple example. You have two notebooks. In one you evaluate the following input cells: Begin["This`"] x=100; End[] If you evaluate any cells in that notebook after evaluating the Begin cell and the x = 100 cell, but before evaluating the End[] cell, x will take the vaule 100 there. In the other notebook you evaluate input cells: Begin["Other`"] x = "hello"; End[] If you evaluate any cells in that notebook after evaluating the Begin cell and the x = "hello" cell, but before evaluating the End[] cell, x will take the vaule "hello" there. But: After you have evaluated both End[] cells, now no matter in what notebook you do further evaluations, if you refer to x you will just get the symbol x and neither of those two values. But if you want to use one of the values from within those context, you qualify x with the context name: This`x 100 This`x + 23 123 Other`x "hello" StringJoin[Other`x, ", world!"] hello, world Jackie wrote: > The variables in different files will be cross-referenced. I don't like > this feature, What should I do ? >> thanks. > > -- Murray Eisenberg murray at math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower phone 413 549-1020 (H) University of Massachusetts 413 545-2859 (W) 710 North Pleasant Street fax 413 545-1801 Amherst, MA 01003-9305

**References**:**if I open multiple files in Mathematica***From:*"Jackie" <Shuangshuang.Zhou@gmail.com>