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    <p>Pretty similar to @John's approach, but since I did it, I will post it :)</p> <p>Here's a generic function to plot a gantt (no dependencies):</p> <pre><code>plotGantt &lt;- function(data, res.col='resources', start.col='start', end.col='end', res.colors=rainbow(30)) { #slightly enlarge Y axis margin to make space for labels op &lt;- par('mar') par(mar = op + c(0,1.2,0,0)) minval &lt;- min(data[,start.col],na.rm=T) maxval &lt;- max(data[,end.col],na.rm=T) res.colors &lt;- rev(res.colors) resources &lt;- sort(unique(data[,res.col]),decreasing=T) plot(c(minval,maxval), c(0.5,length(resources)+0.5), type='n', xlab='Duration',ylab=NA,yaxt='n' ) axis(side=2,at=1:length(resources),labels=resources,las=1) for(i in 1:length(resources)) { yTop &lt;- i+0.1 yBottom &lt;- i-0.1 subset &lt;- data[data[,res.col] == resources[i],] for(r in 1:nrow(subset)) { color &lt;- res.colors[((i-1)%%length(res.colors))+1] start &lt;- subset[r,start.col] end &lt;- subset[r,end.col] rect(start,yBottom,end,yTop,col=color) } } par(mar=op) # reset the plotting margins } </code></pre> <p>Usage example:</p> <pre><code>data &lt;- read.table(text= '"person","n","start","end" "sam",6,0,6 "greg",5,6,11 "teacher",4,11,15 "sam",4,15,19 "greg",5,19,24 "sally",5,24,29 "greg",4,29,33 "sam",3,33,36 "sally",5,36,41 "researcher",6,41,47 "greg",6,47,53',sep=',',header=T) plotGantt(data, res.col='person',start.col='start',end.col='end', res.colors=c('green','blue','brown','red','yellow')) </code></pre> <p>Result:</p> <p><img src="https://i.stack.imgur.com/MGEjF.png" alt="enter image description here"></p>
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    1. COThis answer also fulfilled the parameters I listed. It looks terrific as well. Thank you for sharing, a slightly different approach. +1
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    2. COAlso thank you for the word Gantt as well. I didn't know what it was called.
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    3. CO@TylerRinker: You're welcome :). However I slightly changed the code to make space for the labels.
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