topic Re: How to create variable names depending on loop number in Discussions

How to create variable names depending on loop number

abdulj — Tue, 17 Sep 2013 22:25:16 GMT

Hello

I am trying to create variables dynamically depending on the number of times my loop runs. How can I go about doing this?

Example

for(i=1, i<x, i++,

//some code goes here

var || i = current data table(); //This obviously does not work, but I hope you get the idea. I would eventually like to have var1, var2, var3, etc... till the loop is done

)

Does this make sense?

thanks

Re: How to create variable names depending on loop number

michaelhaslam_p — Wed, 02 Jan 2019 21:08:05 GMT

Abdulj,

Here is one way using Eval ( Substitute ( ))

// dv = dummy variable
x = 10;
For( i = 1, i <= x, i++,
	Eval(
		Substitute(
				Expr(
					dv_variable = i;
					Show( dv_variable );
				),
			Expr( dv_variable ), Parse( "Variable Name " || Char( i ) )
		)
	)
);

Michael

Re: How to create variable names depending on loop number

David_Burnham — Wed, 02 Jan 2019 21:09:30 GMT

Here is an alternate notation:

For( i = 1, i <= x, i++,
	Eval( Parse( Eval Insert( "\[
        var^i^ = Current Data Table()
    ]\" ) ) )
)

-Dave

Re: How to create variable names depending on loop number

abdulj — Wed, 18 Sep 2013 17:45:32 GMT

thanks guys!

Re: How to create variable names depending on loop number

Byron_JMP — Thu, 19 Sep 2013 20:05:54 GMT

Wasn't there a talk on this at the Advanced Scripting Panel discussion at the JMP Discovery conference Last week? It was a great seminar, I wonder if the author posted any notes on his talk.

Re: How to create variable names depending on loop number

Anonymous — Fri, 20 Sep 2013 12:57:32 GMT

Dave,

I've never seen that syntax before, do the ^ surround any variable to include in text? I would have written:

tmp = "var" || char(i) || " = Current Data Table()";

eval(parse(tmp))

This is obviously less efficient than what you've written.

Re: How to create variable names depending on loop number

David_Burnham — Fri, 20 Sep 2013 18:17:16 GMT

Yes enclose each variable with ^ ... ^ and have the jsl statement enclosed in the Eval( Parse( Eval Insert("\[ ... ]\"))) pattern.

For example, the following code sets spec limits for a column:

Open("$SAMPLE_DATA/Big Class.jmp");

cHeight = Column("height");

Column("height") << Set Property( "Spec Limits", {LSL(55), USL(75), Target(65)} );

Let's say we have the following variable assignments that we would like to use:

colName = "height";

lower = 55;

upper = 75;

target = 40;

Then we can write:

Eval( Parse( Eval Insert("\[

Column("^colName^") << Set Property( "Spec Limits", {LSL(^lower^), USL(^upper^), Target(^target^)} );

]\")))

-Dave

Re: How to create variable names depending on loop number

KinKame — Sun, 24 Apr 2016 13:53:28 GMT

oh nice .... thank you very much. Another thing I need to learn in JMP ...

Re: How to create variable names depending on loop number

Mark_Bailey — Thu, 03 Jan 2019 12:18:43 GMT

Why create a new variable for each reference? Why not store the data table reference in a list for access by index or an associative array for access by key?