Thread: blackboard variables

Hi George,
Thanks, the following example is what led to my question.

This didn't work,
SAC > SETBB DEC_FACT1 5
SAC > DECIMATE %DEC_FACT1 FILTER ON
(I also tried this with %DEC_FACT1% and SAC complains when
calling DEC_FACT1)

This, however, works fine,
SAC > SETBB DFACT1 5
SAC > DECIMATE %DFACT1 FILTER ON

This (variables with strings) works fine,
SAC > SETBB STAT_N_VEL '&1,KSTNM&_BHN.VEL.SAC'
SAC > SETBB STAT_E_VEL '&1,KSTNM&_BHE.VEL.SAC'
SAC > READ SETBB STAT_N_VEL SETBB STAT_E_VEL

From this example, it seems to me that *numeric BB variables* are the ones

showing this behaviour. I came across a similar issue when running SAC one
liners as follows;

This didn't work,
READ file1 file2 file3
SETBB MIN_NPTS (min &1,NPTS& &2,NPTS& &3,NPTS&)
SETBB dt &1,DELTA&
SETBB TRACE_LEN (MULTIPLY %MIN_NPTS% %dt%)
(SAC complains when calling MIN_NPTS)

But this works fine,
SETBB MINNPTS (min &1,NPTS& &2,NPTS& &3,NPTS&)
SETBB dt &1,DELTA&
SETBB TRACE_LEN (MULTIPLY %MINNPTS% %dt%)

Thanks again!


On 16 June 2014 12:58, Dongdong Tian <seisman.ustc<at>gmail.com> wrote:

Seems to be a bug of sac v101.6, and it works in the latest version of sac
(v101.6a).

SAC> setbb MIN_NPTS 10000
SAC> fg impulse npts %MIN_NPTS
SAC> lh npts

FILE: IMPULSE - 1
-------------
npts = 10000




2014-06-16 15:00 GMT+08:00 Januka Attanayake <jattanayake<at>gmail.com>:

Hello,
I have noticed that blackboard variables declared with an underscore
(e.g. MIN_NPTS) cannot be recalled (e.g. %MIN_NPTS). Is this a bug or
standard syntax? I am using SAC version 101.6.

Many thanks!

Januka.

--
Januka Attanayake
Postdoctoral Research Associate
Laboratório de Sismologia
Complexo Interdisciplinar
Departamento de Física
Instituto Superior Técnico
Av. Rovisco Pais, 1
1049-001 Lisboa, Portugal

Honorary Research Associate
University College London

University email: januka.attanayake<at>ist.utl.pt
Homepage: http://sites.google.com/site/janukaattanayake/

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--
Januka Attanayake
Postdoctoral Research Associate
Laboratório de Sismologia
Complexo Interdisciplinar
Departamento de Física
Instituto Superior Técnico
Av. Rovisco Pais, 1
1049-001 Lisboa, Portugal

Honorary Research Associate
University College London

University email: januka.attanayake<at>ist.utl.pt
Homepage: http://sites.google.com/site/janukaattanayake/