sand15

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MaplePrimes Activity


These are questions asked by sand15

Hi everybody,

 

I'm working under Windows 7 

 

My need :
A MAPLE code has to be run from an ECLIPSE session (through a cmaple MyCode).
In this ECLIPSE session the user chooses a data file among many, and ECLIPSE then has to tell MyCode what file it has to read.


The solution I figured out :
Step 1 : ECLIPSE  set an environment variable "DataFile" which contains the user's choice, for instance set MyData=NameOfTheFile
Step 2 : Within MyCode I get the value of MyData from these two commands

MyFile := getenv(DataFile):

readdata(MyFile, …)

 

This doesn't work ( getenv(DataFile) returns [1," "] instead of the desired file name).
In fact it seems that getenv enables access to the “native” environment variables of Windows only (for instance HOMEDIR), not to the user defined environment variables (?)


Is  it possible to fix this and how ?

PS  : I face the same difficulties if I type set MyData=NameOfTheFile directly from a cmd command and try to access the value of MyData from a Maple session


Thanks for your help

 

 

Hi everybody,

I am presently developing a MAPLE-based application and I need to trace its evolutions through a “version control process”.
For codes written in other languages I use to use GIT (it acts with text files and it has syntactic coloring for different languages).

I suspect the development teams routinely face this version control issue.
Could you advise me,  on the versioning tools you use ?

Great thanks in advance

Hi everybody,

I use a maplet that contains a DropDownBox named DDB.
This DropDownBox has a list named MyList
I want to replace MyList by a new list named MyNewList

The syntax given in the Maplets[DropDownBox] help page is
Maplets :-Tools :-Set(DDB(itemlist)=MyNewList)

This command returns the error
error in Set, invalid option for  ‘DDB(itemlist)’  ….

Is it a bug or some misuse (in the help page the “itemlist” option is written itemlist* : what is the meaning of this “*” ?)

As always any answer will be greatly appreciated.

Hi everybody,

I am used to using  the DocumentTools :-RunWorksheet command and I am confronted with the following problem :

  • My worksheet is deemed to generate a plot in a png file
    > plotsetup(png, plotoutput=MyFile, …)
    > plot( …)

    But MyFile is not created
     
  • Thinking that the mw file launched by  DocumentTools :-RunWorksheet is seen as a procedure, I have thought that print(plot(…)) would fix the issue.
    Unfortunately the png file is still not created (same behavior with a jpeg file)

I know that  DocumentTools :-RunWorksheet is “experimental” but I wonder if I am doing something wrong or if DocumentTools :-RunWorksheet simply does not support plots ?

Thanks in advance

Hi everybody,

My worksheet begins with these two instructions (this is a notional example)
Digits := 25:
interface(displayprecision = 5):

Then the instruction  evalf(1/3+x/6)  returns  0.33333+0.16667x … which is what I had expected.

I now  want to do a formatted print of  evalf(1/3+x/6)  in some file.
Unfortunately the command  

 fprintf(fd, "%a\n", evalf(1/3+x/6)) 

generates a print with the full digits precision (0.333…..33 with 25 "3" for instance).

How could I force fprintf to print the floating point numbers with the number of digits set by interface(displayprecision = 5) ?
 
(PS : for now I have written some kind of “white elephant” stuff which works well only for very simple algebraic expressions)

Any suggestion or answer will be greatly appreciated

 


 

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