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<H2><A NAME="8_4">8.4 Scatter plots</A></H2>
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<P> Scatter plots are very simple; they plot a number of points
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 specified by their X- and Y-coordinate. Each point is stroked on the
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 image with a mark as with line plots. The stroked marks can also be
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 connected with an optional line.<DIV class="note"><B>Note:</B> Even
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 though it is only scatter plot that was designed to be used with X,Y
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 plots it is perfectly possible to use use both X,Y coordinates for bar
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 and line plots as well.</DIV></P>
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<P> Even though you would normally supply X-coordinates it is still
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 perfectly possible to use a text-scale for X-coordinates to just
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 enumerate the points. This is especially useful when using the
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 &quot;Impulse&quot; type of scatter plot as is shown below.</P>
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<P> Scatter pots are created by including the jpgraph extension
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 &quot;jpgraph_scatter.php&quot; and then creating an instance of plot type of
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 ScatterPlot(). To specify the mark you want to use you access the mark
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 with the instance variable &quot;mark&quot; in the scatter plot. The default is
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 to use an unfilled small circle.</P>
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<P> To create a scatter plot you will create an instance</P>
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<P> A simple example using just default values will illustrate this</P>
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<P><DIV class="example">
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<BR> <A href="exframes/frame_scatterex1.html" target="blank"><IMG border="0"
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HEIGHT="200"  src="img/scatterex1.png" WIDTH="300"></A>
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<BR><B>Figure 57:</B> The simplest possible scatter plot <A href="exframes/frame_scatterex1.html"
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target="blank">[src]</A>&nbsp;
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<P></P>
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</DIV></P>
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<P>We can easily adjust the size and colors for the markers to get
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 another effect as shown below<DIV class="example">
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<BR> <A href="exframes/frame_scatterex2.html" target="blank"><IMG border="0"
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HEIGHT="200"  src="img/scatterex2.png" WIDTH="300"></A>
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<BR><B>Figure 58:</B> The simplest possible scatter plot with adjusted
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 marks <A href="exframes/frame_scatterex2.html" target="blank">[src]</A>
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&nbsp;
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<P></P>
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</DIV></P>
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<P> Another possible variant of scatter plot is impulse-scatter plots.
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 This is a variant of normal scatter plot where each mark have a line
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 from the mark to the Y=0 base line. To change a scatter plot into an
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 impulse scatter plot you have to call the method <A href="../ref/ScatterPlot.html#_SCATTERPLOT_SETIMPULS">
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 SetImpuls()</A> on the scatter plot.</P>
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<P> This type of plots are often used to illustrate signals in
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 conjunction with digital signal processing. The following two examples
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 illustrates simple use of impulse plots.<DIV class="example">
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<BR> <A href="exframes/frame_impulsex1.html" target="blank"><IMG border="0"
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HEIGHT="200"  src="img/impulsex1.png" WIDTH="300"></A>
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<BR><B>Figure 59:</B> A simple impuls plot <A href="exframes/frame_impulsex1.html"
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target="blank">[src]</A>&nbsp;
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<P></P>
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</DIV></P>
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<P> The next example shows how to modify the color and width of the
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 impulse plot<DIV class="example">
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<BR> <A href="exframes/frame_impulsex2.html" target="blank"><IMG border="0"
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HEIGHT="200"  src="img/impulsex2.png" WIDTH="300"></A>
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<BR><B>Figure 60:</B> A modified impuls plot <A href="exframes/frame_impulsex2.html"
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target="blank">[src]</A>&nbsp;
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<P></P>
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</DIV></P>
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<P><DIV class="note"><B>Note:</B> You may draw impulse graphs without
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 any mark by specifying the mark type as (-1) . That way only the
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 impulse lines will be drawn.</DIV></P>
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<P> As a final touch we show two more advanced impulse graphs . In these
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 graphs we have used more advanced formatting for the Y-axis labels as
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 well as adjusted the position of the axis position.<DIV class="example">
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<BR> <A href="exframes/frame_impulsex3.html" target="blank"><IMG border="0"
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HEIGHT="200"  src="img/impulsex3.png" WIDTH="400"></A>
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<BR><B>Figure 61:</B> In this imuplsplot we have adjusted the position
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 of the X-axis to the bottom and also added more decimals to the labels
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 on the Y-axis <A href="exframes/frame_impulsex3.html" target="blank">
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[src]</A>&nbsp;
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<P></P>
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</DIV></P>
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<P><DIV class="example">
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<BR> <A href="exframes/frame_impulsex4.html" target="blank"><IMG border="0"
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HEIGHT="250"  src="img/impulsex4.png" WIDTH="500"></A>
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<BR><B>Figure 62:</B> In this impuls plot we have also added a lineplot
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 with a dotted line style. <A href="exframes/frame_impulsex4.html" target="blank">
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[src]</A>&nbsp;
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<P></P>
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</DIV></P>
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<P></P>
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