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Sep 17, 2013 3:25 PM
(9966 views)

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

1 ACCEPTED SOLUTION

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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

8 REPLIES 8

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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

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Re: How to create variable names depending on loop number

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.

JMP Systems Engineer, Pharm and BioPharm Sciences

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Re: How to create variable names depending on loop number

Here is an alternate notation:

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

-Dave

-Dave

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Re: How to create variable names depending on loop number

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.

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Re: How to create variable names depending on loop number

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

-Dave

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Re: How to create variable names depending on loop number

thanks guys!

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Re: How to create variable names depending on loop number

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

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Re: How to create variable names depending on loop number

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?

Learn it once, use it forever!