SUMMARY

Generates a multi-trace single-window (overlay) plot.

SYNTAX

[P]LOT[2] {ABSOLUTE|RELATIVE} {PRINT {pname} }

INPUT

ABSOLUTE: Plot files treating time as an absolute. Files with different begin times will be shifted relative to the first file.

RELATIVE: Plot each file relative to it's own begin time.

PRINT {pname}: Prints the resulting plot to the printer named in pname, or to the default printer if pname is not used. (This requires that program sgftops is in the path.)

ABSOLUTE:	Plot files treating time as an absolute. Files with different begin times will be shifted relative to the first file.
RELATIVE:	Plot each file relative to it's own begin time.
PRINT {pname}:	Prints the resulting plot to the printer named in pname, or to the default printer if pname is not used. (This requires that program sgftops is in the path.)

DEFAULT VALUES

P2 ABSOLUTE

DESCRIPTION

All files in the data file list are plotted in the same plot window. An optional legend containing the plot symbol and file name can be generated. Fixed x and y axis limits may be defined before using this command. See the XLIM and YLIM commands. The plot is sized to the extrema of the entire file list if fixed limits are not requested. The location of the legend is controlled by the FILEID command.

Unlike PLOT and PLOT1, PLOT2 will plot spectral data. Real/Imaginary data is plotted as Real vs. Frequency. Amplitude/Phase data is plotted as Amplitude vs. Frequency. Imaginary and Phase information are ignored. Spectral data is always plotted in relative mode. Note that in the fequency domain,b, e, and delta are reset to 0, the Nqquist frequency, and df resjpectively. The header values depmin and dapmax are not changed. As with PLOTSP, if XLIM is off, the plot starts at DF=DELTA rather than 0. If XLIM or YLIM were changed before transferring to the frequency domain, it is best to enter XLIM off and YLIM off before calling PLOT2.

Note: If for some reason, the user has both time-series data and spectral data in memory at the same time and does not elect to use the RELATIVE option, the time-series files will be plotted ABSOLUTE and the spectral files will be plotted RELATIVE. Relative mode means relative to the first file. So the order of the files in memory will effect the relation of the plots with respect to each other.

EXAMPLES

The commands used to generate the example plot are given below:

SAC> READ MNV.Z.AM KNB.Z.AM ELK.Z.AM
SAC> XLIM 0.04 0.16
SAC> YLIM 0.0001 0.006
SAC> LINLOG
SAC> SYMBOL 2 INCREMENT
SAC> TITLE 'Rayleigh Wave Amplitude Spectra for NESSEL'
SAC> XLABEL 'Frequency (Hz)'
SAC> PLOT2
SAC> FFT
SAC> XLIM off YLIM off
SAC> line increment list 1 3
SAC> PLOT2 print

ERROR MESSAGES

1301: No data files read in.

SEE COMMANDS

XLIM, YLIM, FILEID, FILENUMBER

LATEST REVISION

April 11, 2010 (Version 101.4)