SAC Developers

A forum for SAC developers to exchange ideas about SAC enhancements, bug fixes, etc.

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Active Message Threads for August 2008

Kuang He
2008-08-31 04:33:29 - 2008-08-31 23:56:03
Hi, I found a problem with sacswap. Although nowadays with sac's ability to read both big- and little-endian sac files, sacswap must be less often used, some people I know are still using it since some of the legacy software such as pssac [3] can only deal with big-endian sac files. PROBLEM: I used sacswap on my linux system to convert a random sac file vel.sac (little-endian) to vel.sac.swap (big-endian), and then from vel.sac.swap (big-endian) to vel.sac.swap.swap (little-endian). By doi... [more]
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Kuang He
2008-08-31 21:07:18 - 2008-08-31 23:29:48
Hi, I just found some little things that could be improved for bin/sacinit.sh . > $ cat bin/sacinit.sh > [snipped] > # Initialize the SAC Enviornment > export SACHOME=/usr/local/jas/sac "export SACHOME=/usr/local/sac" may be a better general setting here. > [snipped] > > # SAC_USE_DATABASE > # Undefined or 1 -- Use SeisMgr Database ( Default ) > # 0 -- Do Not Use SeisMgr Database > # The SeisMgr database attempts to keep the CSS data fields in line > # with those in t... [more]
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Kuang He
2008-08-28 19:48:14 - 2008-08-29 20:52:35
Hi there, I met this "WARNING: Number 4003 integer too large" when I tried to multiply my data by a factor of 10^9, and found in the changelog that it is a known bug. I took a look at the corresponding code snippet in src/ucf/cnvati.c starting from L163: /* - Build integer from the stored digits. */ ifac = 1; *intgr = 0; for( j2 = j1; j2 >= 1; j2-- ){ /* -- Warning.. Approaching maximum integer size. * - Use a fudge factor of... [more]
Hi, An equation is missing from the help file of 'envelope': sqrt(x(n)^2 + y(n)^2). Here is the fix (I've formatted the paragraph after inserting the missing equation): $ diff -u aux/help/envelope.old aux/help/envelope --- aux/help/envelope.old 2008-08-28 17:33:18.000000000 -0400 +++ aux/help/envelope 2008-08-28 17:34:10.000000000 -0400 @@ -9,9 +9,9 @@ DESCRIPTION: This command computes the envelope function of the data in memory. The -envelope is defined by: where x(n) is the ... [more]
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