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Chapters:
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<a href="Introduction.html">1: Introduction</a><br>
<a href="SimpleExample.html">2: Simple example</a><br>
<a href="InvokingGri.html">3: Invocation</a><br>
<a href="GettingMoreControl.html">4: Finer Control</a><br>
<a href="X-Y.html">5: X-Y Plots</a><br>
<a href="ContourPlots.html">6: Contour Plots</a><br>
<a href="Images.html">7: Image Plots</a><br>
<a href="Examples.html">8: Examples</a><br>
<a href="Commands.html">9: Gri Commands</a><br>
<a href="Programming.html">10: Programming</a><br>
<a href="Environment.html">11: Environment</a><br>
<a href="Emacs.html">12: Emacs Mode</a><br>
<a href="History.html">13: History</a><br>
<a href="Installation.html">14: Installation</a><br>
<a href="Bugs.html">15: Gri Bugs</a><br>
<a href="TestSuite.html">16: Test Suite</a><br>
<a href="Acknowledgments.html">17: Acknowledgments</a><br>
<a href="License.html">18: License</a><br>
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Indices:</br>
<a href="ConceptIndex.html"><i>Concepts</i></a><br>
<a href="CommandIndex.html"><i>Commands</i></a><br>
<a href="BuiltinIndex.html"><i>Variables</i></a><br>
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<h3>8.12.5: Plotting several y-columns versus on x-column</h3>
Sometimes you'll have a datafile with the first column being x, and the
other columns being various things to plot versus x. For example, you
might have the data
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1 8 11 9
2 22 21 20
3 11 10 9
4 20 15 10
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in a file called `<font color="#82140F"><code>test.dat</code></font>'. Let's say the x-column is time, and
the y-columns are the readings from three temperature sensors. The
following illustrates how you might plot these data. If you think the
new-command which starts this script is useful, just insert it in your
`<font color="#82140F"><samp>~/.grirc</samp></font>' file and you can just use it without re-defining it each
time. This will give Gri a command called `<font color="#82140F"><code>draw curves</code></font>'.
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`draw curves \xname \y1name ...'
Draw multiple y columns versus an x column. Assumes
that the datafile is open, and that x is in the first
column, with the y values in one or more following
columns.
<p>
The number of columns is figured out from the options,
as is the name of the x-axis, and the labels to be
used on each of the y curves.
{
# NB. the 3 below lets us skip the words 'draw'
# and 'curves', and the name of the x-column.
.num_of_y_columns. = {rpn wordc 3 -}
if {rpn .num_of_y_columns. 1 >}
show "ERROR: `draw curves' needs at least 1 y column!"
quit
end if
<p>
set x name {rpn 2 wordv}
set y name ""
<p>
# Loop through the columns.
.col. = 0
while {rpn .num_of_y_columns. .col. <}
# The x-values will be in column 1, with y-values
# in columns 2, 3, ..., of the file.
.ycol. = {rpn .col. 2 +}
rewind
read columns x=1 y=.ycol.
# At this point, you may want to change line thickness,
# thickness, color, dash-type, etc. For illustration,
# let's set dash type to the column number.
set dash .col.
draw curve
draw label for last curve {rpn .col. 3 + wordv}
.col. += 1
end while
}
<p>
open test.dat
draw curves time y1 y2 y3
</font></PRE>
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