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Put a changeable formula in one variable

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    #1

    Put a changeable formula in one variable

    Is it possible to put a formula(with variables) in one variable so that is could be changed by end user without programming it in.

    Example :

    vanswer = var1 + var2 +var3 x.07

    Where vanswer is created with the expression builder within A5.
    Now if I want to change this I woud have to use the expression builder.
    I would like the formula to be able to be changed by the end user.



    vanswer = formvar1

    Formvar1 is a var that has var1 + var2+ var3 x .07 in it. So if the end user had to change the formula they could access formvar1 and
    modify the formula.


    Does this make sense?
    PS. I suck at programming, I just kind of know the basics of A5.

    Thank you, Paul
    Tags: None
    #2
    Re: Put a changeable formula in one variable

    What's the context?

    Report, form, ...?
    There can be only one.

    Comment

      #3
      Re: Put a changeable formula in one variable

      Thats commonly known as code indirection

      Xbasic uses EVALUATE_TEMPLATE( Command_String )

      Comment

        #4
        Re: Put a changeable formula in one variable

        Formvar1 is a var that has var1 + var2+ var3 x .07 in it. So if the end user had to change the formula they could access formvar1 and
        modify the formula.
        Would it be the .07 that you wanted to allow the user to change? Such as a tax rate?

        That's generally handled by having a table where the user can maintain such "variable" info. The formula then looks up the rate in the table.
        There can be only one.

        Comment

          #5
          Re: Put a changeable formula in one variable

          I was thinking if of something more involved like var1 + var2 x 1.24 / 14 . ( where the original formula would changed completely)

          The context could be a report or a form just to find the answer instead of doing it by hand all the time.

          Comment

            #6
            Re: Put a changeable formula in one variable

            Same question, same answer
            Did you try EVALUATE_TEMPLATE( )
            it does that

            Comment

              #7
              Re: Put a changeable formula in one variable

              Did you mean eval()?

              Code:
              var1 = 7
var2 = 9

formula = "var1 + var2 * 1.24/14"

? evaluate_template(formula)
= ""


? eval(formula)
= 7.79714285714286
              There can be only one.

              Comment

                #8
                Re: Put a changeable formula in one variable

                I was thinking of making up a string with an xbasic command, which itself could contain eval()
                Perhaps more involved than Paul intended - beyond an arithmetic statement.

                Within which you could declare the variables themselves as necessary.
                Like a macro code segment.

                I also unfortunately assumed eval() to have been considered already.
                Last edited by Ray in Capetown; 01-10-2013, 10:04 AM.

                Comment

                  #9
                  Re: Put a changeable formula in one variable

                  To Stan & Ray, thanks for the help. At this time functions and xbasic eludes me. So plan B, spreadsheet. Thank you . This will be put on the back burner for now, but I will figure it out one day with your help that you have given me. I now have a starting point.

                  Comment

                    #10
                    Re: Put a changeable formula in one variable

                    See if this helps. Unzip to a new directory, open Alpha, add this table to one of your databases. Try the form. Activity is driven by the onarrive event of the formula variable field.

                    main.zip
                    There can be only one.

                    Comment

                      #11
                      Re: Put a changeable formula in one variable

                      Date Created: 09-Jan-2013 02:57:22 PM
                      'Last Updated: 09-Jan-2013 02:58:30 PM
                      'Created By : SMathews
                      'Updated By : SMathews
                      dim shared to_display as C
                      dim shared rslt as N
                      to_display = ui_get_text("Formula","Enter valid formula.","7*13")
                      rslt = eval(to_display)

                      Stan, this is very close to what I am looking for. Can the "7*13" be put in table so the ui_get_text can read it. Then if the "7*13" has to be changed completely different ,( for example, 3 x 10 + 15 -2), an end user can change this in the table? Make sense???

                      Comment

                        #12
                        Re: Put a changeable formula in one variable

                        Yes.
                        cpount.zip
                        There can be only one.

                        Comment

                          #13
                          Re: Put a changeable formula in one variable

                          Perfect ! With seeing your example, I can do it! Thanks for your time. If you had explained it I would have been lost.

                          Comment

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