Thread: Re: sac-help Digest, Vol 17, Issue 6

Started: 2006-12-05 19:43:37
Last activity: 2006-12-05 19:43:37
Topics: SAC Help
Peggy
2006-12-05 19:43:37
Hello, Fellow-SAC'ers,

I haven't gotten a response to my question (included below), so thought
I would
try again. I'll rephrase the original question and add to it.

I am plotting XY data in a text (ascii) file using readtable (readtable content Y).
The x-value is time (julian day). Readtable seems to have no means for interpolating
missing values (using a sample rate, which would have to be supplied somewhere)
and plotting a zero for any values that don't exist in the data file (as in the
case for gaps). Does anyone know a clever way to do this, short of preprocessing
the file and filling in the values myself?

I am aware that the merge command will do what I want with SAC binary files, so maybe
this is a route to go....

Thanks,
Peg





*******************************************************************
Peg Johnson, USArray Data Control Analyst
IRIS DMC 1408 NE 45th Street, Suite 201 Seattle, WA 98105
Tel. 206.547.0393 Fax. 206.547.1093
*******************************************************************



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Today's Topics:

1. skipping null y-values in a time plot of ascii data (Peggy)


----------------------------------------------------------------------

Message: 1
Date: Fri, 10 Nov 2006 13:12:46 -0800
From: Peggy <peggy<at>iris.washington.edu>
Subject: [SAC-HELP] skipping null y-values in a time plot of ascii
data
To: sac-help<at>iris.washington.edu
Message-ID: <4554EB4E.90001<at>iris.washington.edu>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

I am plotting XY data in a text (ascii) file usinig readtable (readtable content Y).

The x-value is time (julian day). I want to plot nothing if there is no value (ie, a blank line) for a particular day, but it seems readtable will just skip this and scoot all the values down, so that a gap of 20 days does not show up in the plot.

I've tried setting a dummy value of -99 (e.g.) instead of having a blank value. Is there any way to get SAC to skip a specified dummy value and plot nothing for it? I want to see the gap in time, even if there is no value during that time period.

Thanks,

Peg

*******************************************************************
Peg Johnson, USArray Data Control Analyst
IRIS DMC 1408 NE 45th Street, Suite 201 Seattle, WA 98105
Tel. 206.547.0393 Fax. 206.547.1093
*******************************************************************



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End of sac-help Digest, Vol 17, Issue 6
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