Improper tan and atan on Solaris

From: Andreas Hoeschler (ahoesch_at_smartsoft.de)
Date: 06/02/04

  • Next message: Andreas Hoeschler: "Summary: Improper tan and atan on Solaris" 
    Date: Wed, 2 Jun 2004 16:06:35 +0200
To: sunmanagers@sunmanagers.org

    Hi,

    >> on Solaris the tan() and atan() functions do not seem to work
    >> properly.
    >> The same code built on MacOSX produces proper results. On Solaris
    >> these
    >> functions return wrong values. Anybody seen this and knows hot to fix
    >> that? I am using the gcc 3.x from sunfreeware.com.
    >
    > What does "improper" mean in this context?
    >
    > (Inputs, outputs?)

    Oh sorry. Here is what I get:

    > 2004-06-02 15:58:29.294 RasterServiceFillMerc[24022] aa 1.252687
    > 2004-06-02 15:58:29.306 RasterServiceFillMerc[24022] tan (aa)
    > 1072958209.000000

    > 2004-06-02 15:58:29.318 RasterServiceFillMerc[24022] aa
    > 1072957976.967294
    > 2004-06-02 15:58:29.318 RasterServiceFillMerc[24022] atan (aa) =
    > 1104148997.000000

    MacOSx and my pocket calculator come to identical values, Solaris has a
    different understanding of these functions. Any ideas?

    I could work around the tan() problem by using sin(aa) / cos(aa)
    instead instead of tan(aa). However, I don't know of a replacement for
    atan() and I don't have my Bronstein handy right now. Any ideas?

    Thanks!

    Regards,

       Andreas
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  • Next message: Andreas Hoeschler: "Summary: Improper tan and atan on Solaris"

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