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POcolor key legend in r
 

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    <p>I am trying hard to figure out to add color gridient label to my plot ( <a href="https://stackoverflow.com/questions/10405967/barplot-in-loop-in-r">link to previous question</a>). Sorry for keep asking but this is maximum I could push me forward.</p> <pre><code>#data 1: lab1 &lt;- 1:10 group &lt;- rep(1:3, each = length (lab1)) label &lt;- rep(lab1, 3) avar &lt;- rep(c(0, 1, 4, 5, 6, 8, 10, 11, 12, 13), 3) myd &lt;- data.frame (group, label, avar) # data 2 fillcol &lt;- rep(rnorm(length(lab1)-1, 0.5, 0.2), 3) group1 &lt;- rep(1:3, each = length(fillcol)/3) # this variable will be used to fill color in bars filld &lt;- data.frame(group1, fillcol) colbarplot &lt;- function(group) { myd1 &lt;- myd[myd$group == group,] filld1 &lt;- filld[filld$group1 == group,] blues &lt;- colorRampPalette(c("yellow", "blue")) barplot(as.matrix(diff(myd1$avar)), horiz=T, col=blues(10)[10* filld1$fillcol], axes=F, xlab="Mark") axis(1, labels=myd$label, at=myd$avar) axis(3, labels=myd$avar, at=myd$avar) } par(mfrow = c(4, 1)) par(mar = c(2.5, 1, 2.5, 1)) sapply(unique(myd$group),function(x) colbarplot(x)) </code></pre> <p>Now I am struggling to add legend, sorry for this new user. </p> <pre><code> blues &lt;- colorRampPalette(c("yellow", "blue")) colors &lt;- blues(10) count &lt;- length(colors) m &lt;- matrix(1:count, count, 1) m1 &lt;- m image(m, col=colors, ylab="", axes=FALSE) </code></pre> <p>I produced color scale that is not what I am expecting, I am trying plot a smaller legend, less in width and height, along with original scale use in color coding. </p> <p><img src="https://i.stack.imgur.com/b9ASn.jpg" alt="enter image description here"></p> <p>Here are some unsuccessful trials for labeling: </p> <pre><code> colab &lt;- c(round (min(filld$fillcol), 2), round(max(filld$fillcol), 2)) colpos &lt;- c(0.33 * max(mapdat$position),0.66 * max(mapdat$position)) axis(1, labels=colab, at=colpos) </code></pre>
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