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POR: multiplot not working because of error in UseMethod("getModelInfo",model)
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copied!<p>In R, I have prepared multiple <code>ggplot2</code> figures, that are saved to variables like this:</p> <pre class="lang-js prettyprint-override"><code>flashplot <- ggplot(flash, aes(x=flash$Year, y=flash$Proc)) + stat_smooth(method="lm", formula = "flash$Proc ~ poly(flash$Year, 2, raw=TRUE)", n=14, level=0.9) + geom_point(shape=19) + ylab("Percentage of total existing versions") + xlab("Years of Existence") + scale_x_continuous(breaks = c(0,2,4,6,8,10,12,14,16,18,20)) </code></pre> <p>plotting a single figure works as expected, but I want to plot 4 figures (2 by 2) using multiplot, as described <a href="http://wiki.stdout.org/rcookbook/Graphs/Multiple%20graphs%20on%20one%20page%20%28ggplot2%29/" rel="nofollow">in the R cookbook</a>.</p> <p>As I got an error, I tried the example from the cookbook, which I thould would work, but it gave me the same error:</p> <pre><code>> multiplot(p1, p2, p3, p4, cols=2) Error in UseMethod("getModelInfo", model) : no applicable method for 'getModelInfo' applied to an object of class "c('gg', 'ggplot')" </code></pre> <p>I am using R 2.15.2 under Windows 7, and the newest packages of <code>ggplot2</code> and <code>coefplot</code>:</p> <pre><code>> sessionInfo() R version 2.15.2 (2012-10-26) Platform: i386-w64-mingw32/i386 (32-bit) locale: [1] LC_COLLATE=German_Austria.1252 LC_CTYPE=German_Austria.1252 [3] LC_MONETARY=German_Austria.1252 LC_NUMERIC=C [5] LC_TIME=German_Austria.1252 attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] coefplot_1.1.8 ggplot2_0.9.3 loaded via a namespace (and not attached): [1] colorspace_1.2-0 dichromat_1.2-4 digest_0.6.0 grid_2.15.2 [5] gtable_0.1.2 labeling_0.1 MASS_7.3-22 munsell_0.4 [9] plyr_1.8 proto_0.3-9.2 RColorBrewer_1.0-5 reshape2_1.2.2 [13] scales_0.2.3 stringr_0.6.2 useful_1.1.6 </code></pre> <p>any hints to help me solving my problem would be highly appreciated. Am I missing something? I already searched the web, but found nothing helpful</p> <p>-- As requested, here is the example data:</p> <pre><code>library(ggplot2) # This example uses the ChickWeight dataset, which comes with ggplot2 # First plot p1 <- ggplot(ChickWeight, aes(x=Time, y=weight, colour=Diet, group=Chick)) + geom_line() + ggtitle("Growth curve for individual chicks") # Second plot p2 <- ggplot(ChickWeight, aes(x=Time, y=weight, colour=Diet)) + geom_point(alpha=.3) + geom_smooth(alpha=.2, size=1) + ggtitle("Fitted growth curve per diet") # Third plot p3 <- ggplot(subset(ChickWeight, Time==21), aes(x=weight, colour=Diet)) + geom_density() + ggtitle("Final weight, by diet") # Fourth plot p4 <- ggplot(subset(ChickWeight, Time==21), aes(x=weight, fill=Diet)) + geom_histogram(colour="black", binwidth=50) + facet_grid(Diet ~ .) + ggtitle("Final weight, by diet") + theme(legend.position="none") # No legend (redundant in this graph) multiplot(p1, p2, p3, p4, cols=2) </code></pre>

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