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<HTML>
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<TITLE>sample1d</TITLE>
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<H1>sample1d</H1>
<HR>
<PRE>
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sample1d - Resampling of 1-D data sets
</PRE>
<H2>SYNOPSIS</H2><PRE>
<B>sample1d</B> <I>infile</I> [ <B>-Fl|a|c</B> ] [ <B>-H</B>[<I>nrec</I>] ] [ <B>-I</B><I>xinc</I> ] [
<B>-M</B>[<I>flag</I>] ] [ <B>-N</B><I>knotfile</I> ] [ <B>-S</B><I>xstart</I> ] [ <B>-T</B><I>x-col</I>] [ <B>-V</B> <B>]</B> <B>[</B>
<B>-bi[s][</B><I>n</I><B>]</B> <B>]</B> <B>[</B> <B>-bo[s]</B> <B>]</B>
</PRE>
<H2>DESCRIPTION</H2><PRE>
<B>sample1d</B> reads a multi-column ASCII [or binary] data set
from file [or standard input] and resamples the time
series/profile at locations where the user needs the val
ues. The user must provide the column number of the inde
pendent (monotonically increasing <B>or</B> decreasing) variable.
Equidistant or arbitrary sampling can be selected. All
columns are resampled based on the new sampling interval.
Several interpolation schemes are available.
<I>infile</I> This is a multi-column ASCII [of binary, see <B>-b</B>]
file with one column containing the independent
variable (which must be monotonically in/de-creas
ing) and the remaining columns holding misc. data
values. If no file is provided, sample1d reads
from standard input.
</PRE>
<H2>OPTIONS</H2><PRE>
No space between the option flag and the associated argu
ments.
<B>-F</B> Choose from <B>l</B> (Linear), <B>a</B> (Akima spline), and <B>c</B>
(natural cubic spline) [Default is <B>-Fa</B>]. You may
change the default interpolant; see INTERPOLANT in
your .gmtdefaults file.
<B>-H</B> Input file(s) has Header record(s). Number of
header records can be changed by editing your .gmt
defaults file. If used, <B><A HREF="GMT.html">GMT</A></B> default is 1 header
record.
<B>-I</B> <I>xinc</I> defines the sampling interval. [Default is the
separation between the first and second abcissa
point in the <I>infile</I>]
<B>-M</B> Multiple segment file. Segments are separated by a
record whose first character is <I>flag</I>. [Default is
'>'].
<B>-N</B> <I>knotfile</I> is an optional ASCII file with the x loca
tions where the data set will be resampled in the
first column
<B>-S</B> For equidistant sampling, <I>xstart</I> indicates the
location of the first output value. [Default is the
<B>-T</B> Sets the column number of the independent variable
[Default is 0 (first)].
<B>-V</B> Selects verbose mode, which will send progress
reports to stderr [Default runs "silently"].
<B>-bi</B> Selects binary input. Append <B>s</B> for single precision
[Default is double]. Append <I>n</I> for the number of
columns in the binary file(s). [Default is 2 (or
at least the number of columns implied by <B>-T</B>].
<B>-bo</B> Selects binary output. Append <B>s</B> for single preci
sion [Default is double].
</PRE>
<H2>EXAMPLES</H2><PRE>
To resample the file profiles.tdgmb, which contains
(time,distance,gravity,magnetics,bathymetry) records, at
1km equidistant intervals using Akima's spline, try'
sample1d profiles.tdgmb <B>-I</B>1 <B>-Fa</B> <B>-T</B>1 > pro
files_equi_d.tdgmb
To resample the file depths.dt at positions listed in the
file grav_pos.dg, using a cubic spline for the interpola
tion, try
sample1d depths.dt <B>-N</B>grav_pos.dg <B>-Fc</B> > new_depths.dt
</PRE>
<H2>SEE ALSO</H2><PRE>
<I>gmt</I>(l), <I><A HREF="filter1d.html">filter1d</A></I>(l)
</PRE>
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