specifying shapes and colors for groups in IGRAPH and GGRAPH

[xenia]

Hello all,
I know that IGRAPH will be removed in the next version of spss, but can anyone tell me how to change the shape of the points in a scatterplot from dots to stars, using IGRAPH syntax?
Also, using GGRAPH syntax, it is possible to present a graph using e.g. different colors for two levels of a categorical variable, but spss will use two different colors automatically. How can I specify in the syntax that I want e.g. green for males and orange for females?
I know creating a template and applying it is a solution, but I was wondering if it can be done through syntax.

thank you

[Albert-Jan Roskam]

> Sent: Wednesday, February 27, 2013 11:58 AM
> Subject: [SPSSX-L] specifying shapes and colors for groups in IGRAPH and GGRAPH
>
> Hello all,
> I know that IGRAPH will be removed in the next version of spss, but can
> anyone tell me how to change the shape of the points in a scatterplot from
> dots to stars, using IGRAPH syntax?
> Also, using GGRAPH syntax, it is possible to present a graph using e.g.
> different colors for two levels of a categorical variable, but spss will use
> two different colors automatically. How can I specify in the syntax that I
> want e.g. green for males and orange for females?
> I know creating a template and applying it is a solution, but I was
> wondering if it can be done through syntax.
>
> thank you

hi Xenia,

There is a little program that comes with spss, called syntaxconvert.exe, that can be used to convert
tables to ctables, igraph to ggraph. As for the second point: perhaps you should specify a VARIABLE LEVEL
other than scale, ie. nominal or ordinal.

Regards,
Albert-Jan

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[xenia]

Thank you, however whatever type variable one specifies spss will choose the color. My question is how can I, not spss, specify in the syntax the color or shape that I want for each group. E.g. I want males to be presented as green squares, females as red stars. How do I link in the syntax the male level of variable gender with the green color and the square shape etc.

Thank you

[Jon K Peck]

First, note that IGRAPH is NOT going away.  The command was rebuilt a few releases ago to use the Viz engine, but it is not being removed.

Given that, I would expect that the preference settings for the graphics cycle through color settings would apply here.  So start at Edit > Options > Charts > Style Cycles Colors.  Similarly for other preference settings.

Caveat:  I haven't actually tried this.


Jon Peck (no "h") aka Kim
Senior Software Engineer, IBM
[hidden email]
new phone: [phone]




From:        xenia <[hidden email]>
To:        [hidden email],
Date:        02/27/2013 09:37 AM
Subject:        Re: [SPSSX-L] specifying shapes and colors for groups in IGRAPH              and GGRAPH
Sent by:        "SPSSX(r) Discussion" <[hidden email]>

---

Thank you, however whatever type variable one specifies spss will choose the
color. My question is how can I, not spss, specify in the syntax the color
or shape that *I want* for each group. E.g. I want males to be presented as
green squares, females as red stars. How do I link in the syntax the male
level of variable gender with the green color and the square shape etc.

Thank you



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[Art Kendall]

on a data or syntax window click <edit> <options><charts> (<colors>,<markers>).
On 2/27/2013 11:27 AM, xenia wrote:

Thank you, however whatever type variable one specifies spss will choose the
color. My question is how can I, not spss, specify in the syntax the color
or shape that *I want* for each group. E.g. I want males to be presented as
green squares, females as red stars. How do I link in the syntax the male
level of variable gender with the green color and the square shape etc.

Thank you



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Sent from the SPSSX Discussion mailing list archive at Nabble.com.

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[xenia]

Thank you,
however, I'd like to be able to do that by writing code in the syntax window, not by going into Options and changing things interactively.

[David Marso]

No Joy!
You will likely need to design these using templates and then
SET CTEMPLATE = "some file containing template".
--

xenia wrote

Thank you,
however, I'd like to be able to do that by writing code in the syntax window, not by going into Options and changing things interactively.

[xenia]

thank you

[Andy W]

Here is an example in GGRAPH using map statements to assign particular categories to shapes and colors. I don't see any reason to prefer IGRAPH, and here is some more discussion of what mapping statements are in the grammar of graphics (http://spssx-discussion.1045642.n5.nabble.com/Manually-adding-legend-in-GPL-td5714324.html#a5714343).

*****************************************.
input program.
loop #i = 1 to 30.
compute X = RV.NORMAL(0,1).
compute Y = RV.NORMAL(0,1).
compute cat1 = TRUNC(RV.UNIFORM(1,3)).
compute cat2 = TRUNC(RV.UNIFORM(1,3)).
end case.
end loop.
end file.
end input program.
dataset name sim.
exe.


* Chart Builder.
GGRAPH
  /GRAPHDATASET NAME="graphdataset" VARIABLES=X Y cat1 cat2
  /GRAPHSPEC SOURCE=INLINE.
BEGIN GPL
 SOURCE: s=userSource(id("graphdataset"))
 DATA: X=col(source(s), name("X"))
 DATA: Y=col(source(s), name("Y"))
 DATA: cat1=col(source(s), name("cat1"), unit.category())
 DATA: cat2=col(source(s), name("cat2"), unit.category())
 GUIDE: axis(dim(1), label("X"))
 GUIDE: axis(dim(2), label("Y"))
 GUIDE: legend(aesthetic(aesthetic.color.interior), label("cat1"))
 SCALE: cat(aesthetic(aesthetic.color.interior), map(("1",color.blue),("2",color.green)))
 SCALE: cat(aesthetic(aesthetic.shape), map(("1",shape.square),("2",shape.star)))
 ELEMENT: point(position(X*Y), color.interior(cat1), shape(cat2))
END GPL.
*****************************************.

Changing default shapes or colors in templates is pretty easy, it is harder to get it to apply consistently to different types of charts.

[xenia]

oh, this is great, will give it a try,
thank you