# RE: st: RE: AW: -graph combine- question

 From "Kieran McCaul" To Subject RE: st: RE: AW: -graph combine- question Date Sat, 24 Oct 2009 07:32:07 +0800

```...

Thanks to everyone who commented on this problem.  I thought that there might be some easy solution to this that I was missing, but that doesn't seem to be the case.

The difference in the lengths of the x-axes is caused by the difference in the y-axis labels; larger y-axis labels shorten the x-axis.

While you can manipulate the margin around the y-axis title, you can't do this around the axis labels.

The following generated and combined the four figures:

clear
set obs 101
gen x=_n-1
gen y4= x^2
gen y3=y4/10
gen y2=y4/100
gen y1=y4/1000

forvalues i=1/4   {
twoway (line y`i' x, lc(black)),               ///
ylabel(#5, angle(horizontal) format(%3.1f))  ///
xlabel(0(10)100)  ///
ytitle("Y")               ///
xtitle("X") legend(off) name(y`i', replace)
}
gr combine y1 y2 y3 y4, col(2) iscale(0.7) graphregion(margin(zero))

I can sort of get what I want by fiddling with the right margin of the y-titles:

forvalues i=1/4   {
local margin = ""
if `i' == 2 {
local margin = ",margin(r=-1)"
}
if `i' == 3 {
local margin = ",margin(r=-3)"
}
if `i' == 4 {
local margin = ",margin(r=-5)"
}
twoway (line y`i' x, lc(black)),               ///
ylabel(#5, angle(horizontal) format(%3.1f))  ///
xlabel(0(10)100)  ///
ytitle("Y" `margin')               ///
xtitle("X") legend(off) name(y`i', replace)
}
gr combine y1 y2 y3 y4, col(2) iscale(0.7) graphregion(margin(zero))

______________________________________________
Kieran McCaul MPH PhD
WA Centre for Health & Ageing (M573)
University of Western Australia
Level 6, Ainslie House
48 Murray St
Perth 6000
Phone: (08) 9224-2701
Fax: (08) 9224 8009
email: Kieran.McCaul@uwa.edu.au
http://myprofile.cos.com/mccaul
http://www.researcherid.com/rid/B-8751-2008
______________________________________________
If you live to be one hundred, you've got it made.
Very few people die past that age - George Burns

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of G Livesey
Sent: Saturday, 24 October 2009 2:52 AM
To: statalist@hsphsun2.harvard.edu
Subject: RE: st: RE: AW: -graph combine- question

Dear Statalisters,

Kieran says:
Is there "an easy way to ensure that the LENGTH of the x-axis is the same in
all FOUR graphs".

As  Kieran, Nick, and I find, it seems there is some fiddling to do to get
what one is aiming for. Some method of command to control events (if
possible) rather than fiddling around would be helpful, especially when
several graphs are combined. Here I show FOUR graphs as a 2row x 2col
combination, but have done 4row x 4col combinations and had to fiddle
extensively.

Including Nick's clever suggestion is helpful with some settings, but not
necessarily with others.
With other backgrounds/schemes the approach may not be ok as color of the
ytitle  may be seen through the background, as in example that follows, and
presumably would not work at all when the graph is edited to be transparent
- say in PowerPoint:

sysuse auto, clear
gen mpgX2= 2* mpg
gen priceX1p5=1.5*price
gr twoway scatter mpg price, ytitle("Hello" "world 1")  xtitle("") name(one)
graphregion(color(white)) ysize(2) xsize(2)
gr twoway scatter mpgX2 priceX1p5, ytitle("", color("scheme background"))
xtitle("") name(two)  graphregion(color(white)) ysize(2) xsize(2)
gr twoway scatter mpg price, ytitle("Hello" "world 3") name(three)
graphregion(color(white)) ysize(2) xsize(2)
gr twoway scatter mpg price, ytitle("", color("scheme background"))
name(four)  graphregion(color(white)) ysize(2) xsize(2)
gr combine   one two  three four, row(2) ysize(2) xsize(2) ycommon xcommon
graphregion(color(white))

When the ytitles in the offending graphs are removed then the x-axis lengths
differ, as in the next example:

sysuse auto, clear
gen mpgX2= 2* mpg
gen priceX1p5=1.5*price
gr twoway scatter mpg price, ytitle("Hello" "world 1")  xtitle("") name(one)
graphregion(color(white)) ysize(2) xsize(2)
gr twoway scatter mpgX2 priceX1p5, ytitle("", color("scheme background"))
xtitle("") name(two)  graphregion(color(white)) ysize(2) xsize(2)
gr twoway scatter mpg price, ytitle("Hello" "world 3") name(three)
graphregion(color(white)) ysize(2) xsize(2)
gr twoway scatter mpg price, ytitle("", color("scheme background"))
name(four)  graphregion(color(white)) ysize(2) xsize(2)
gr combine   one two  three four, row(2) ysize(2) xsize(2) ycommon xcommon
graphregion(color(white))

I modifies the data so that it is not identical in each graph, which is more
usually the case and this difference in  data can affect the presentation.
Maybe this problem is one for the developers at some point?

Thans to all,

Geoff. L>

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Winter
Sent: 23 October 2009 15:29
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: RE: AW: -graph combine- question

Indeed, I have struggled with this as well.  The not-perfect solution I
usually use is to force Stata to include the space that the titles
*would* take up in each graph, so the x-axis ends up the same size in
all of them.  This can be done by setting the color of the title to
"scheme background":

. gr twoway scatter mpg price, ytitle("Hello" "world") name(one)

. gr twoway scatter mpg price, ytitle("Hello" "world", color("scheme
background")) name(two)

. gr combine one two

And then fiddle with the -imargin- option to -graph combine- to get them
closer together if desired.

-Nick

On 10/23/2009 4:59 AM, G Livesey wrote:
> Dear Statalisters,
>
> Kieran's question is a good one. Martine's answer may solve Kieran's
> current problem, though only partially answers the question.
>
> "ensure that the LENGTH of the x-axis is the same"
>
> I have no easy solution  to do this and ask how to do this when the
> graphs to combine do not have
>
> A) a common x-axis or
> B) perhaps (I did not try this) span different ranges of a common axis
> or
> C) carry different axis-titles (e.g. some with and some without such
> titles), which can affect the proportion of space given to the graph and
> axis/margins and so length of the axis.
>
> A more comprehensive solution than -common axis- would be welcome
> though I have not found one myself, and like Kieran have in the past
> had to play about a lot to get what I want.
>
> Does a solution exist? Can one be created?
>
> With much appreciation and many thanks,
>
> Geoff. Livesey
>
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Martin
> Weiss
> Sent: 23 October 2009 09:20
> To: statalist@hsphsun2.harvard.edu
> Subject: st: AW: -graph combine- question
>
>
>
> <>
>
> You are not looking for the -xcommon- option to -graph combine-, are
> you?
>
>
> *************
> clear*
> set obs 10000
>
>
> gen x1=  rnormal(10,100)
> gen x2=  rnormal(100,10)
>
> gen num=_n
>
> tw (line x1 num) in 1/5000,  /*
> */ name(gr1, replace) nodraw
> tw (line x2 num),  /*
> */ name(gr2, replace) nodraw
>
> graph combine gr1 gr2, /*
> */ ycommon xcommon
> *************
>
>
>
> HTH
> Martin
>
>
> -----Ursprüngliche Nachricht-----
> Von: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] Im Auftrag von Kieran
> McCaul
> Gesendet: Freitag, 23. Oktober 2009 04:33
> An: statalist@hsphsun2.harvard.edu
> Betreff: st: -graph combine- question
>
> ....
>
> Suppose I have four graphs that I combine to look like this:
>
> http://i37.tinypic.com/314wkfb.jpg
>
> My question is: is there an easy way to ensure that the length of the
> x-axis is the same in all four graphs when they are combined.
>
> I can probably fiddle around with margin gaps until I get them right,
> but is there something a little easier than that?
>
> Thanks.
>
>
> ______________________________________________
> Kieran McCaul MPH PhD
> WA Centre for Health & Ageing (M573)
> University of Western Australia
> Level 6, Ainslie House
> 48 Murray St
> Perth 6000
> Phone: (08) 9224-2701
> Fax: (08) 9224 8009
> email: Kieran.McCaul@uwa.edu.au http://myprofile.cos.com/mccaul
> http://www.researcherid.com/rid/B-8751-2008
> ______________________________________________
> If you live to be one hundred, you've got it made.
> Very few people die past that age - George Burns
>
>
>
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--
--------------------------------------------------------------
Nicholas Winter                                 434.924.6994 t
Assistant Professor                             434.924.3359 f
Department of Politics                  nwinter@virginia.edu e
University of Virginia          faculty.virginia.edu/nwinter w
PO Box 400787, 100 Cabell Hall
Charlottesville, VA 22904

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