[SAC-HELP] skipping null y-values in a time plot of ascii data

[Peggy]

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

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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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