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Oct 10, 2017 2:56 PM
(1052 views)

Thank you for giving amazing suggestions.

I encountered something else and I have always been curious about this. Whenever I come across this, I try to stack to circumvent the problem.

In a graph builder, how to plot without knowing the name of the column

```
collist =fudt<< get column names(string);
qdt=Char(collist[9]); //Assuming I want to plot column number 9 on the Y axis, say for example "Data_ABC"
gbfc = fudt<<Graph Builder(
Size( 1899, 922 ),
Show Control Panel( 0 ),
Variables(
X( :Index ),
X( :Lot, Position( 1 ) ),
X( :Wafers, Position( 1 ) ),
Y( :qdt),// THIS DOESN't WORK - I want to understand the syntax
Color( :temp )
)
Elements( Points( X( 1 ), X( 2 ), X( 3 ), Y, Legend( 33 ) ) )
);
```

Thank you.

1 ACCEPTED SOLUTION

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Oct 10, 2017 3:10 PM
(2090 views)

Solution

```
dt = Current Data Table();
cdlg = Column Dialog( clist = ColList( "Pick 2 Columns", Min Col( 2 ), Max Col( 2 ) ) );
cols = cdlg["clist"];
newColExpr = Expr( dt << New Column( "Radius", Numeric, Formula( Sqrt( Expr( cols[1] ) ^ 2 + Expr( cols[2]; ) ^ 2 ) ) ) );
Eval( Eval Expr( newColExpr ) );
```

Best

Uday

Uday

9 REPLIES

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Oct 10, 2017 3:10 PM
(2091 views)

```
dt = Current Data Table();
cdlg = Column Dialog( clist = ColList( "Pick 2 Columns", Min Col( 2 ), Max Col( 2 ) ) );
cols = cdlg["clist"];
newColExpr = Expr( dt << New Column( "Radius", Numeric, Formula( Sqrt( Expr( cols[1] ) ^ 2 + Expr( cols[2]; ) ^ 2 ) ) ) );
Eval( Eval Expr( newColExpr ) );
```

Best

Uday

Uday

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Oct 10, 2017 3:28 PM
(1042 views)

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Oct 11, 2017 5:50 AM
(1016 views)

Your variable qdt points to the name of the column. It is not a column itself. You have to reference it using the construct column(fudt, qdt):

```
gbfc = fudt << Graph Builder(
Size( 1899, 922 ),
Show Control Panel( 0 ),
Variables(
X( :Index ),
X( :Lot, Position( 1 ) ),
X( :Wafers, Position( 1 ) ),
Y( Column( fudt, qdt ) ), // use column pointed to by the qdt variable
//Y( :qdt), // THIS DOESN't WORK - I want to understand the syntax
Color( :temp ),
),
Elements( Points( X( 1 ), X( 2 ), X( 3 ), Y, Legend( 33 ) ) )
);
```

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Oct 11, 2017 12:09 PM
(1003 views)

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Oct 14, 2017 7:36 PM
(929 views)

Uday,

Thanks for your post. Here i can see the fomula code as follows. Can you explan what means cols&#**91**;**1**&#**93 and cols[2]?**

Formula**(** Sqrt**(** Expr**(** cols&#**91**;**1**&#**93**; **)** ^ **2** + Expr**(** cols&#**91**;**2**&#**93**; **)** ^ **2** **)** **)**

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Oct 14, 2017 9:17 PM
(920 views)

@GoodMan,

Thanks for pointing out . I recollected and recalled that from the post . Not the way I would do it .

```
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
ColNames = dt << Get Column Names("String");
Stmt = "";
Stmt = ":" || ColNames[2] || "*2";
Eval( Parse( Eval Insert("\[ dt << New Column("Age_Squared",Numeric,Continuous,Formula(^Stmt^)); ]\" ) ) );
```

Best

Uday

Uday

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Oct 14, 2017 11:03 PM
(912 views)

Thanks. Following your new code, go back the the previous example, still i have some problem. Can you help me?

```
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
cdlg = Column Dialog( clist = ColList( "Pick 2 Columns", Min Col( 2 ), Max Col( 2 ) ) );
cols = cdlg["clist"];
newColExpr = Expr( dt << New Column( "Radius", Numeric, Formula( Sqrt( Expr( cols ) ^ 2 + Expr( cols) ^ 2 ) ) ) );
Eval( Eval Expr( newColExpr ) );
```

GM

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Oct 14, 2017 11:53 PM
(907 views)

I checked your previous code again. Now i understand that [=[. So now I can figure it out now. Thank you anyway!

GM

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Oct 15, 2017 6:44 AM
(888 views)

Those were meant to be square brackets. I've edited the post and corrected that.

-Jeff