[19009] in s-news-athena
[S] Bugs in 2D Line Plot
daemon@ATHENA.MIT.EDU (Yen, Joseph [PRI])
Mon Aug 23 14:21:00 1999
Message-Id: <CB4D2EE791E0D111A7F300805FEAF6640124DF3E@RARUSRAEXS4>
From: "Yen, Joseph [PRI]" <JYen1@prius.jnj.com>
To: "'s-news@wubios.wustl.edu'" <s-news@wubios.wustl.edu>
Date: Mon, 23 Aug 1999 14:12:51 -0400
Mime-Version: 1.0
Content-Type: text/plain
> Dear S-Plus users:
>
> Please be aware the following bugs found in producing 2D line plots. So
> far there is no resolution offered by MathSoft in its S-Plus 2000.
>
> ==========================================================================
> ===================
The problem: With the same line styles and line weights, vertical and
horizontal lines appear to be different from slanted lines in 2D line plots.
> I plotted 2 polygons in draft mode (using S-Plus 4.5 under Windows 95 on
> PC) with specifications as follows.
>
> (1) (x,y) = (2,0), (2,1), (3,2), (4,2), (5,2).
> (2) (x,y) = (1.999,0), (2,1), (3,2), (4,2.001), (5,2).
> (3) Both polygons used Dot Dot Dash line style with line weight of 15.
>
> The horizontal and vertical segements in the 1st polygon appeared to be
> different from the other segments of both polygons. It seems that, when
> one enlarges the line width of a segment, one enlarges the widths of dots
> and dashes as well only if it is a horizontal or a vertical segment. To
> me, the enlargement in both directions for dots and dashes like this
> should be the preferred graphical presentation. I also experimented with
> different line weights from 1/4 to 12. Similar findings were obseved.
> Plots of these 2 polygons look the same only when the line weights are
> hairline.
> ==========================================================================
> ===================
>
> Joseph F. Yen
> Clinical Biostatistics
> R. W. Johnson Pharmaceutical Research Institute
> Route 202, P.O. Box 300
> Raritan, New Jersey 08869-0602
> (908) 704-4830
> E-Mail: jyen1@prius.jnj.com
>
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