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RE: st: graphics complaints (Windows too)


From   "G Livesey" <glivesey@inlogic.co.uk>
To   <statalist@hsphsun2.harvard.edu>
Subject   RE: st: graphics complaints (Windows too)
Date   Thu, 19 Nov 2009 17:05:32 -0000

Dear All,

I confirm Friedrich observation for my Windows system, and note that:

1) the connect line has a somewhat similar appearance, but steps in one
direction only at a lower regular frequency (unrelated to screen pixels).
2) the function line wavers at higher but irregular frequency (also
unrelated to pixels).

Such appears at all sizes of the graph window.

Such in STATA 11 SE, 21st Oct installation and updates, on MS Win XP (ado
versions noted below signature line).


I would support technical examination of this issue.

Geoff. Livesey.

Note also:

which twoway
C:\Program Files\Stata11\ado\base\t\twoway.ado
*! version 1.2.0  16apr2007

which scatter
C:\Program Files\Stata11\ado\base\s\scatter.ado
*! version 1.2.0  16apr2007

which range
C:\Program Files\Stata11\ado\base\r\range.ado
*! version 2.1.1  13dec1998








-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Friedrich Huebler
Sent: 19 November 2009 16:03
To: statalist@hsphsun2.harvard.edu
Subject: Re: st: graphics complaints (Windows too)


Dave wrote about Stata on OS X but I have a similar observation about Stata
on Windows, specifically concerning -twoway function-.

A y=x line drawn with -twoway function- is not as straight as a line drawn
with -twoway scatter, connect-. The difference can be illustrated with the
following commands.

. clear
. set obs 2
. gen x = .
. replace x = 0 in 1
. replace x = 100 in 2
. gen y = .
. replace y = 0 in 1
. replace y = 100 in 2
. twoway (scatter y x, connect(l) clwidth(thin)) (function y=x+1, range(0
100) lwidth(thin)), aspect(1)

The -function- line is uneven and can indeed be described as "shocked with
electricity", to use Dave's words. Is it possible to draw a
-function- line as straight as a -scatter, connect- line?

Friedrich

On Wed, Nov 18, 2009 at 3:57 PM, Airey, David C <david.airey@vanderbilt.edu>
wrote:
> . sysuse auto
> (1978 Automobile Data)
>
> . scatter weight length, ms(oh) // small o
>
> never renders well on my system, and copying the graph preserves the 
> oblong symbols
>
> . scatter weight length, ms(Oh) // large O
>
> doesn't show the complaint
>
> I sent you off list the horrible rendering of  a graph twoway function 
> (y=x). Looked like someone shocked it with electricity.
>
> -Dave

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