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    <p>So, the problem is creating a line plot that represents the interaction.</p> <p>To do this, you need to format your data in the appropriate form. You want to plot segments, and for this you need the co-ordinates of each segment in a single row in your data frame:</p> <pre><code>interaction &lt;- merge(propdata, relation, by.x="name", by.y="name1") interaction &lt;- cbind(interaction, merge(propdata, relation, by.x="name", by.y="name2")[, c("X", "Y")]) names(interaction)[8:9] &lt;- c("Xend", "Yend") interaction name diameter X Y colr name2 score Xend Yend 1 A 4.3 1 1 10 B 1.1 2 3 2 A 4.3 1 1 10 C 2.2 3 3 3 A 4.3 1 1 10 D 5.4 3 3 4 B 8.3 2 3 20 C 3.1 4 4 5 B 8.3 2 3 20 D 2.0 4 4 </code></pre> <p>Now we run into another problem. In <code>ggplot2</code>, you can only have a single size scale. Since you have a size argument for both the point and line, that really represents two things, this can't be done without a workaround.</p> <p>Thus the workaround is to manually draw the circles using <code>geom_polygon</code>.</p> <p>Construct the data frame with circles:</p> <pre><code>circle &lt;- function(x, y, d, color, scale=1){ d &lt;- d * scale angle &lt;- seq(-pi, pi, length = 50) data.frame( x = x + d/2*sin(angle), y = y + d/2*cos(angle), color=color) } circles &lt;- ddply(propdata, .(name), function(x)with(x, circle(X, Y, diameter, colr, scale=0.2))) </code></pre> <p>Finally, create the plot:</p> <pre><code>ggplot() + geom_polygon(data=circles, aes(group=name, x=x, y=y, fill=color)) + geom_text(data=propdata, aes(x=X, y=Y, label=name), hjust=0, vjust=0) + geom_segment(data=interaction, aes(x=X, y=Y, xend=Xend, yend=Yend, size=score)) + scale_size("Inter", to=c(0, 5)) + coord_equal() </code></pre> <p><img src="https://i.stack.imgur.com/aixSm.png" alt="enter image description here"></p>
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    1. POPlotting interaction in R graphs
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    1. COWith credit to @BrianDiggs who helped.
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    2. COpretty nice...only thing I would like to put label a little far from the circle center ...thanks for the answer ...
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    3. CO.also can we control line size as sometime becomes so bold that it is informative but not pretty ..thanks for the answer ...
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