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<title>Gri: axis scaling</title>
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<br>
Chapters:
<br>
<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="GriInThePress.html">17: Gri in Press</a><br>
<a href="Acknowledgments.html">18: Acknowledgments</a><br>
<a href="License.html">19: License</a><br>
<br>
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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<h2>4.2: Axis scaling</h2>
<!-- latex: \index{@code{..xlast..}, last drawn x value} -->
<!-- latex: \index{@code{..ylast..}, last drawn y value} -->
<!-- latex: \index{@code{..xmargin..}, left margin} -->
<!-- latex: \index{@code{..ymargin..}, bottom margin} -->
<!-- latex: \index{@code{..xsize..}, x-axis length} -->
<!-- latex: \index{@code{..ysize..}, y-axis length} -->
<!-- latex: \index{@code{..xleft..}, x value at left of plot} -->
<!-- latex: \index{@code{..xright..}, x value at right of plot} -->
<!-- latex: \index{@code{..xinc..}, x increment on axes} -->
<!-- latex: \index{@code{..ybottom..}, y value at bottom of plot} -->
<!-- latex: \index{@code{..ytop..}, y value at top of plot} -->
<!-- latex: \index{@code{..yinc..}, y increment on axes} -->
Gri normally assumes that you are plotting scientific graphs, and
therefore whenever it sees a command like `<font color="#82140F"><code>draw curve</code></font>' or
`<font color="#82140F"><code>draw symbol</code></font>', it draws an appropriate axis first. You can turn
this feature off, by using `<font color="#82140F"><code>draw axes none</code></font>' before the other
`<font color="#82140F"><code>draw</code></font>' command.
<p>
Furthermore, Gri picks axis scales by itself, by scanning the (`<font color="#82140F"><code>x</code></font>',
`<font color="#82140F"><code>y</code></font>') columns. If you don't like the scales Gri picks, you can
override them (see <a href="AxisRange.html#Range">Range</a>).
<p>
Gri normally draws axes labelled at left and bottom, and with an axis
frame with tics all around. If you don't like this default axis style
you can specify other styles. For example, if the commands
`<font color="#82140F"><code>draw x axis</code></font>' and `<font color="#82140F"><code>draw y axis</code></font>' are placed before the `<font color="#82140F"><code>draw curve</code></font>'
command, Gri will realize you've already specified axes, and just draw
them on the left and bottom sides of the box, without completing the
axis frame.
<p>
For your general use, Gri stores the minimum and maximum x and y
values of the <b>axes</b> in the variables `<font color="#82140F"><code>..xleft..</code></font>',
`<font color="#82140F"><code>..xright..</code></font>', `<font color="#82140F"><code>..ybottom..</code></font>', and `<font color="#82140F"><code>..ytop..</code></font>'. It also
stores the increments used in labelling these axes in the
`<font color="#82140F"><code>..xinc..</code></font>' and `<font color="#82140F"><code>..yinc..</code></font>' variables.
<p>
To determine the minimum and maximum values of column data, you
may use the built-in RPN functions `<font color="#82140F"><code>min</code></font>', `<font color="#82140F"><code>max</code></font>', and
`<font color="82140F"><code>mean</code></font>' (see <a href="ManipulatingColumns.html#ManipulationofColumnsetc">Manipulation of Columns etc</a>).
<p>
Gri stores the last (x,y) pair on a curve (whether data or axis) in the
`<font color="#82140F"><code>..xlast..</code></font>' and `<font color="#82140F"><code>..ylast..</code></font>' variables
<p>
Gri stores the axis sizes in `<font color="#82140F"><code>..xsize..</code></font>' and `<font color="#82140F"><code>..ysize..</code></font>'. It
stores the space to the left of the plot in `<font color="#82140F"><code>..xmargin..</code></font>' and the
space below the plot in `<font color="#82140F"><code>..ymargin..</code></font>'.
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