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copied!<p>One issue is fundamentally not getting what <code>plt</code> does. From <code>?par</code> we have:</p> <pre><code> ‘plt’ A vector of the form ‘c(x1, x2, y1, y2)’ giving the coordinates of the plot region as fractions of the current figure region. </code></pre> <p>So your plot region is of zero size if you do <code>par(plt=c(1, 1, 1, 1))</code>, so that doesn't seem to be the way to go. This is because the figure region <em>contains</em> the plot region.</p> <p>This plot seems to cover the entire region, without any margins:</p> <pre><code>op <- par(mar = rep(0, 4)) plot(1:10) par(op) </code></pre> <p>it covers it so well you can't see the axes or the box:</p> <p><img src="https://i.stack.imgur.com/uO8se.png" alt="full region covered"></p> <p>This assumes the default for 0 outer margin (<code>oma</code>). Is this what you were looking for?</p> <p>We can see that just adjusting the plot margins, as above, we also change the <code>plt</code> parameter as a side effect:</p> <pre><code>> par("plt") [1] 0.1173174 0.9399106 0.1457273 0.8828467 > op <- par(mar = rep(0, 4)) > par("plt") [1] 0 1 0 1 > par(op) > par("plt") [1] 0.1173174 0.9399106 0.1457273 0.8828467 </code></pre> <p>indicating that simply setting the plot margins is sufficient to get a plot/figure region encompassing the entire device.</p> <p>Of course, there is still a bit of internal padding that insures the ranges of the axes are slightly large than the range of the data in both the <code>x</code> and <code>y</code> coordinates. But you can control this with <code>xaxs</code> and <code>yaxs</code> --- see <code>?par</code></p> <p><strong>Update:</strong> As the OP has shown the sort of figure they are trying to produce without margins, I can provide a reproducible example:</p> <pre><code>set.seed(1) dat <- matrix(rnorm(100*100), ncol = 100, nrow = 100) layout(matrix(1:2, ncol = 2)) image(dat) op <- par(mar = rep(0, 4)) image(dat) par(op) layout(1) </code></pre> <p>which gives for comparison:</p> <p><img src="https://i.stack.imgur.com/t1cLz.png" alt="comparison of default and no margins respectively"></p> <p>and showing just the full plotting region:</p> <p><img src="https://i.stack.imgur.com/jRh3U.png" alt="full plot region covered"></p>

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