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User Defined Global Variables - How to do it?
*To*: mathgroup at smc.vnet.net
*Subject*: [mg95338] User Defined Global Variables - How to do it?
*From*: Donald DuBois <donabc at comcast.net>
*Date*: Fri, 16 Jan 2009 06:07:16 -0500 (EST)
I am trying to define my own global variables which will be known to every function that I write just like the system global variable "$HomeDirectory". I have a function which
has been written to read values from a disk file and using those values calculate the values
of the global variables.
I do not know where to put this fuhction so that, at the begiinning of a Mathematica session, these user defined global varialbes are available to be used by any function that I have written that is part of the packages that are autmatically loaded at the beginning of a session.
I have previously defined my own global variables in a file called init.m and this file is located in directory:
C:\Documents and Settings\Donald\Application Data\Mathematica\Autoload\Foo
(I have created the last directory "Foo" off of Autoload.)
This method works for global variables that are defined by a simple
assignment statement within the file init.m:
globalVarA = value
Every function that I have written and put into a package - and these
packages are loaded *** automatically *** at the beginning of a Mathematica
session - can use and knows the value of globalVarA which is defined
in init.m. So, before the packages are loaded at the first time I hit Shift + Enter the system already knows the value of globalVarA because it was defined in the init.m file.
I now need global variables that cannot be defined so easily by a simple
assignment statement. Their values have to be read in and calculated in some function
that I call. The sole purpose of this function is to read in and calculate the values
of these global variables. There are two problems:
(1) I don't know how
to make these values globally available to all other functions that are used
in the session and that are defined in the packages I created.
(2) I don't know how to get this function [the function which calculates the values
of the global variables) to "start up" automatically BEFORE I ever have to
hit the first Shift + Enter. This function which calculaes the values of global variables uses itself some of the other functions I defined in the packages I created which are automatically loaded at session start time.
For instance, below is the schematic defintion of a function where I am
calculating the values of two global variables, globalVarB and globalVarC
that I want every other function to have access to [access to the values
in these global variables] if they need the
values of these two variables in their own calculations, just like every
function has access to the system global variable "$HomeDirectory".
globalDefintions[] := Module[{},
(* Read in values and do calculations for globalVarB and globalVarC ")
Return[{globalVarB, globalVarC}]
];(* End Module globalDefinitions *)
Then the function is invoked:
{globalVarB, globalVarC} = globalDefinitions[];
Where can I put the definition of this function called globalDefintions and its invocation so that:
(1) the user does not have to explicity invoke the
globalDefinition function at the beginning of every
Mathematica session
(2) every function in any package that I write should know the values
of these global variables. (and these packages that I wrote are currently automatically loaded at the beginning of a Mathematica session).
I have tried putting the above defintion of the globalDefinition function in the
init.m file and then calling this function from within
the init.m file, but that doesn't work. I have tried the same thing by
putting the globalDefinition function in the Private and Public
sections of a package that I have written
(which, as stated above, is automatically loaded at the beginning of every
session) and invoked the function within the package - also in a the private and
public sections of the package
(in a cell in the package that is an initialization cell) but that does not work either.
Are there any solutions?
Thanks in advance for your help.
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