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- How to add 45° (y=x) line to graph?

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Aug 21, 2013 9:40 AM
(4559 views)

Does anyone have a smarter way to add a 45° (y=x) line to an x-y plot? I currently do the following:

- Set x-axis and y-axis pixels to the same value in the Frame Size dialog
- Use the drawing tool to manually add a line to the plot

The line is never quite perfect and has to be adjusted when plot is changed.

JMP Developers: this would be a great option to add to: Y-axis specification, Reference Lines. It is useful when comparing predicted versus actual; lab determinations versus standard values; etc.. Thinking about this more, having the option to enter f(x) for a y-reference line would be even better than just the 45° (y=x) line.

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Solution

In the *Fit Y by X* platform you can choose *Fit special...* and lock intercept to zero and slope to one.

In most platforms it is also possible to draw a line representing a function by a graphics script. Right-click on the graph and select *Customize...* In the dialog press the plus sign and select *Y Function* in the *Templates* drop-down menu. Add *Y Function( y = x, x ); *to get a straight y=x line.

JSL-example:

dt = Open**(** "$SAMPLE_DATA/Fitness.jmp" **)**;

biv = dt << Bivariate**(** Y**(** :MaxPulse **)**, X**(** :RunPulse **)** **)**;

Report**(** Biv **)[**Framebox**(** **1** **)]** << add graphics script**(** Y Function**(** y = x, x **)** **)**;

5 REPLIES

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In the *Fit Y by X* platform you can choose *Fit special...* and lock intercept to zero and slope to one.

In most platforms it is also possible to draw a line representing a function by a graphics script. Right-click on the graph and select *Customize...* In the dialog press the plus sign and select *Y Function* in the *Templates* drop-down menu. Add *Y Function( y = x, x ); *to get a straight y=x line.

JSL-example:

dt = Open**(** "$SAMPLE_DATA/Fitness.jmp" **)**;

biv = dt << Bivariate**(** Y**(** :MaxPulse **)**, X**(** :RunPulse **)** **)**;

Report**(** Biv **)[**Framebox**(** **1** **)]** << add graphics script**(** Y Function**(** y = x, x **)** **)**;

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Aug 21, 2013 1:16 PM
(3133 views)

Very cool. I tried it in Graph Builder and it works like a charm. Here's an example:

dt = open**(**"$sample_data\Boston Housing.jmp"**)**;

gb = Graph Builder**(**

Show Control Panel**(** **0** **)**,

Variables**(** X**(** :rooms **)**, Y**(** :distance **)** **)**,

Elements**(** Points**(** X, Y, Legend**(** **1** **)** **)** **)**,

SendToReport**(**

Dispatch**(** **{}**, "rooms", ScaleBox,

**{**Min**(** **0** **)**, Max**(** **12** **)**, Inc**(** **2** **)**, Minor Ticks**(** **1** **)}** **)**,

Dispatch**(** **{}**, "distance", ScaleBox,

**{**Min**(** **0** **)**, Max**(** **12** **)**, Inc**(** **2** **)**, Minor Ticks**(** **1** **)}** **)**,

Dispatch**(** **{}**, "Graph Builder", FrameBox,

**{**Marker Size**(** **3** **)**, Add Graphics Script**(**

**2**, Description**(** "Script" **)**, Y Function**(** x, x **)**

**)**, Grid Line Order**(** **1** **)**, Reference Line Order**(** **3** **)}** **)**

**)**

**)**;

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Aug 21, 2013 10:21 PM
(3133 views)

Here is another script using the Bivariate platform (I use JMP 10.0.2):

dt = Open("$SAMPLE_DATA/Fitness.jmp");

dt << Bivariate(

Y(:MaxPulse),

X(:RunPulse),

SendToReport(

Dispatch(

{},

"Bivar Plot",

FrameBox,

{Add Graphics Script(2, Description("Script"), YFunction(x, x)),

Grid Line Order(1), Reference Line Order(3)}

)

)

);

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Mar 12, 2016 8:31 AM
(3133 views)

How can the 45 degree reference line be reformatted as dashes and alternate color?

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Mar 12, 2016 2:01 PM
(3133 views)

Here is a version of the platform with the line dashed and red

dt = Open**(** "$sample_data\Boston Housing.jmp" **)**;

gb = Graph Builder**(**

Show Control Panel**(** **0** **)**,

Variables**(** X**(** :rooms **)**, Y**(** :distance **)** **)**,

Elements**(** Points**(** X, Y, Legend**(** **1** **)** **)** **)**,

SendToReport**(**

Dispatch**(** **{}**, "rooms", ScaleBox, **{**Min**(** **0** **)**, Max**(** **12** **)**, Inc**(** **2** **)**, Minor Ticks**(** **1** **)}** **)**,

Dispatch**(** **{}**, "distance", ScaleBox, **{**Min**(** **0** **)**, Max**(** **12** **)**, Inc**(** **2** **)**, Minor Ticks**(** **1** **)}** **)**,

Dispatch**(**

**{}**,

"Graph Builder",

FrameBox,

**{**Marker Size**(** **3** **)**, Add Graphics Script**(**

**2**,

Description**(** "Script" **)**,

Pen Color**(** "red" **)**;

Line Style**(** "dashed" **)**;

Y Function**(** x, x **)**;

**)**, Grid Line Order**(** **1** **)**, Reference Line Order**(** **3** **)}**

**)**

**)**

**)**;

The Graphing Elements are documented in the Scripting Guide, starting on page 497. The Scripting Guide is available under the JMP Help==>Books==>Scripting Guide.

Jim