Updating the Graph Builder's Element statement

[#1]

Hi - I want to change the style of the Graph Builder's box-and-whisker plot to a plot of points from within a JSL script. The Graph Builder initially includes an Elements statement that looks like this:

				Elements( Box Plot( Y, Legend( 9 ) ) ),

I therefore want to modify that statement from within JSL to:

				Elements( Points( Y, Legend( 9 ) ) ),

I've found the << Add Element, << Update Element and << Remove Element commands for the GraphBuilderBox within the Scripting Index, but I can't work out how to apply them to achieve the effect I want. The example given in the Index (adding a regression line) doesn't directly relate to my situation, but I'm guessing that I need something like the following, where gb is my Graph Builder object:

report(gb)[GraphBuilderBox(1)] << Update Element(1, 1, 1, {Type("Points"), Y})

This evidently isn't right however - so I just need an example to show me what the correct syntax ought to be. Can anyone help me with this, please?

Many thanks.

[#2]

Hi @DMR,

Update Element() will change the properties of an existing element, but as far as I know will not allow you to change the type of element it is. Try deleting the existing element and adding a new one. Example below. 

Hope this helps!

@julian

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

gb = Graph Builder(
	Size( 528, 448 ),
	Show Control Panel( 0 ),
	Variables( X( :age ), Y( :height ) ),
	Elements( Box Plot( X, Y, Legend( 4 ) ) )
);

Wait(1);

gbb = Report( gb )[Graph Builder Box( 1 )];

gbb << Remove Element(1, 1, 1);
gbb << Add Element(1, 1, {Type( "Points" ), X, Y, Legend( 5 )});

[#3]

Hi Julian,

I'm closer to understanding the problem now, but unfortunately I'm still not quite there.  The difference between my situation and your example is that I'm using a discrete grouping variable instead of a continuous X variable: the following variation of your script illustrates the issue:

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

gb = Graph Builder(
	Variables( Y( :height ), Group X( :sex ) ),
	Elements( Box Plot( Y, Legend( 10 ) ) )
	);

wait( 1 );

gbb = Report( gb )[Graph Builder Box( 1 )];

// How do I modify the following two lines to replace the Box Plot above by Points?

gbb << Remove Element(1, 1, 1);
gbb << Add Element(1, 1, {Type( "Points" ), X, Y, Legend( 5 )});

If you can just show me how to modify the final two lines, the problem will be solved.

[#4 · Accepted solution]

I see just what your issue is now. Since you're using an X Grouping, and not an actual X variable, the indexing for the elements isn't standard. As per the docs:

obj << Get Element(xposition, yposition, i )

But, with an X Grouping, rather than an X, it seems that the first element isn't accessible with (1,1,1), (0,1,1), (.,1,1) or anything else I've tried.  So, here's what I came up with: temporarily define an X variable so you can access the element, and then remove the X variable once you've made the changes you need. I find it entirely inelegant, but it works. I'll try to find out if there is a proper way to access the elements when no X is defined so you don't need this workaround.  

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

gb = Graph Builder(
	Variables( Y( :height ), Group X( :sex ) ),
	Elements( Box Plot( Y, Legend( 10 ) ) )
	);

wait( 1 );

gbb = Report( gb )[Graph Builder Box( 1 )];

//define an X temporarily
gbb << Add Variable( {:age, Role( "X" )} );

gbb << Remove Element(1, 1, 1);
gbb << Add Element(1, 1, {Type( "Points" ), X, Y, Legend( 5 )});

//remove the X
gbb << Remove Variable( {:age, Role( "X" )} );

[#5]

Inelegant it may be, but it works - and ultimately that's all that matters!

Many thanks.