--- title: [R] Understanding position_dodge() and position_dodge2()... description: A detailed walkthrough compares ggplot2's position_dodge() and position_dodge2() functions used to arrange grouped bars, boxplots, and other elements... canonical: https://daily.dev/posts/r-understanding-position-dodge-and-position-dodge2-in-ggplot2-1tw9y7xp0 twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: [R] Understanding position_dodge() and position_dodge2() in ggplot2 | daily.dev og:description: A detailed walkthrough compares ggplot2's position_dodge() and position_dodge2() functions used to arrange grouped bars, boxplots, and other elements... og:url: https://daily.dev/posts/r-understanding-position-dodge-and-position-dodge2-in-ggplot2-1tw9y7xp0 og:image: https://api.daily.dev/og/posts/1tW9Y7XP0.png og:image:alt: [R] Understanding position_dodge() and position_dodge2() in ggplot2 og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # [R] Understanding position_dodge() and position_dodge2() in ggplot2 **[R-bloggers](https://daily.dev/sources/rbloggers)** · 9 min read · 1 upvotes · 0 comments ## Summary A detailed walkthrough compares ggplot2's position_dodge() and position_dodge2() functions used to arrange grouped bars, boxplots, and other elements side-by-side. It explains how the width parameter interacts differently with geom_bar's own width setting in each function, why changing width has no visual effect in position_dodge2() when used with bars, and how the two functions handle missing group levels differently when preserve = 'single' is set (leaving a gap versus re-centering remaining elements). Code examples using the mtcars dataset illustrate each behavior, and a summary table contrasts the two functions' use cases, padding, and reverse-order support. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### Why does changing the width parameter in position_dodge2() have no effect on my bar chart in ggplot2? Position_dodge2() arranges bars using their pre-computed bounding box intervals rather than calculating center slot offsets from a dodge span, so changing its width parameter produces no visible change when bar widths are already set by geom_bar(width). To control bar widths with position_dodge2(), set the width directly in geom_bar() instead, or use the padding parameter to add spacing between bars. _daily.dev surfaces practical ggplot2 fixes like this for developers debugging chart layout quirks._ ### What is the difference between position_dodge(preserve = "single") and position_dodge2(preserve = "single") when a group level is missing at one x-axis category? Position_dodge(preserve = "single") keeps fixed slot assignments, so a missing group level leaves a blank gap where that bar would normally sit. Position_dodge2(preserve = "single") instead re-centers the remaining dodged elements, packing them together without leaving an empty gap, as shown with mtcars where gear = 4 has zero cars at cyl = 8. _developers troubleshooting grouped chart gaps can track ggplot2 layout edge cases on daily.dev._ ### How does the width argument in geom_bar() interact with the width argument in position_dodge() in ggplot2? Geom_bar(width) sets the total physical width allocated to bars at each x-axis level, with individual bar width derived by dividing that value by the number of group elements, while position_dodge(width) sets the total span across which the center positions of those bars are spaced. When both are equal, bars touch without gaps or overlap; a smaller geom_bar width creates gaps, and a smaller dodge width causes overlap. _anyone tuning grouped bar layouts can revisit ggplot2 spacing mechanics via daily.dev._ ## Similar posts on daily.dev - [\[R\] How to Position the Legend Inside a Plot in ggplot2](https://daily.dev/posts/r-how-to-position-the-legend-inside-a-plot-in-ggplot2-d3qrgvbcw) · R-bloggers · 0 upvotes · 0 comments - [Dual scaled y-axis with ggplot\(\)](https://daily.dev/posts/dual-scaled-y-axis-with-ggplot--visqo0w1i) · R-bloggers · 0 upvotes · 0 comments - [How to Create Boxplots and Model Data in R Using ggplot2](https://daily.dev/posts/how-to-create-boxplots-and-model-data-in-r-using-ggplot2-zzgaiupyd) · freeCodeCamp · 2 upvotes · 0 comments - [How to Create Scatterplots and Model Data in R Using ggplot2](https://daily.dev/posts/how-to-create-scatterplots-and-model-data-in-r-using-ggplot2-isburylnh) · freeCodeCamp · 1 upvotes · 0 comments - [Plotting Distributions in R](https://daily.dev/posts/plotting-distributions-in-r-4uqsdynin) · R-bloggers · 0 upvotes · 0 comments --- Tags: [#r](https://daily.dev/tags/r), [#data-visualization](https://daily.dev/tags/data-visualization) [View this post on daily.dev](https://daily.dev/posts/r-understanding-position-dodge-and-position-dodge2-in-ggplot2-1tw9y7xp0) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"[R] Understanding position_dodge() and position_dodge2() in ggplot2","url":"https://daily.dev/posts/r-understanding-position-dodge-and-position-dodge2-in-ggplot2-1tw9y7xp0","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/r-understanding-position-dodge-and-position-dodge2-in-ggplot2-1tw9y7xp0"},"datePublished":"2026-08-31T02:02:46.658Z","dateModified":"2026-08-31T02:03:11.176Z","description":"A detailed walkthrough compares ggplot2's position_dodge() and position_dodge2() functions used to arrange grouped bars, boxplots, and other elements...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/c6769675941db6e23035f91cdb6d7da3?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/c6769675941db6e23035f91cdb6d7da3?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"R-bloggers","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"R-bloggers","logo":"https://media.daily.dev/image/upload/t_logo,f_auto/v1/logos/98bcbbdf72774292a55ceda8f2277f1e","url":"https://daily.dev/sources/rbloggers"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/r-understanding-position-dodge-and-position-dodge2-in-ggplot2-1tw9y7xp0","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":1},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"r,data-visualization","timeRequired":"PT9M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"R-bloggers","item":"https://daily.dev/sources/rbloggers"},{"@type":"ListItem","position":3,"name":"[R] Understanding position_dodge() and position_dodge2() in ggplot2"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/r-understanding-position-dodge-and-position-dodge2-in-ggplot2-1tw9y7xp0#faq","mainEntity":[{"@type":"Question","name":"Why does changing the width parameter in position_dodge2() have no effect on my bar chart in ggplot2?","acceptedAnswer":{"@type":"Answer","text":"Position_dodge2() arranges bars using their pre-computed bounding box intervals rather than calculating center slot offsets from a dodge span, so changing its width parameter produces no visible change when bar widths are already set by geom_bar(width). To control bar widths with position_dodge2(), set the width directly in geom_bar() instead, or use the padding parameter to add spacing between bars. daily.dev surfaces practical ggplot2 fixes like this for developers debugging chart layout quirks."}},{"@type":"Question","name":"What is the difference between position_dodge(preserve = \"single\") and position_dodge2(preserve = \"single\") when a group level is missing at one x-axis category?","acceptedAnswer":{"@type":"Answer","text":"Position_dodge(preserve = \"single\") keeps fixed slot assignments, so a missing group level leaves a blank gap where that bar would normally sit. Position_dodge2(preserve = \"single\") instead re-centers the remaining dodged elements, packing them together without leaving an empty gap, as shown with mtcars where gear = 4 has zero cars at cyl = 8. developers troubleshooting grouped chart gaps can track ggplot2 layout edge cases on daily.dev."}},{"@type":"Question","name":"How does the width argument in geom_bar() interact with the width argument in position_dodge() in ggplot2?","acceptedAnswer":{"@type":"Answer","text":"Geom_bar(width) sets the total physical width allocated to bars at each x-axis level, with individual bar width derived by dividing that value by the number of group elements, while position_dodge(width) sets the total span across which the center positions of those bars are spaced. When both are equal, bars touch without gaps or overlap; a smaller geom_bar width creates gaps, and a smaller dodge width causes overlap. anyone tuning grouped bar layouts can revisit ggplot2 spacing mechanics via daily.dev."}}]} ```