目标

ggvis图形导出为PNG文件(包括在.Rmd文档中)。

问题

我对Node.js基本上一无所知,除了它很棒,我应该了解更多。

我得到的是:

library(ggvis)
mtcars %>% ggvis(~mpg, ~wt) %>% export_png()
Writing to file plot.png
Guessing layer_points()

module.js:340
    throw err;
          ^
Error: Cannot find module 'd3'
    at Function.Module._resolveFilename (module.js:338:15)
    at Function.Module._load (module.js:280:25)
    at Module.require (module.js:364:17)
    at require (module.js:380:17)
    at Object.<anonymous> (/usr/local/src/vega/index.js:11:6)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Module.require (module.js:364:17)

设置

平台
  • OS X小牛(10.9.5)
  • RStudio(0.98.945)
  • 使用devtools::install_github("hadley/ggvis")安装ggvis(0.3.0.9001)和依赖项
  • https://github.com/trifacta/vega克隆为/usr/local/src/vega
  • 链式./bin/vg2png -> /usr/local/src/vega/bin/vg2png

  • sessionInfo()
    sessionInfo()
    R version 3.1.0 (2014-04-10)
    Platform: x86_64-apple-darwin13.1.0 (64-bit)
    
    locale:
    [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
    
    attached base packages:
    [1] graphics  grDevices utils     datasets  stats     methods   base
    
    other attached packages:
    [1] knitr_1.6        pander_0.3.8     ggvis_0.3.0.9001 lubridate_1.3.3  dplyr_0.2.0.9001 plyr_1.8.1       stringr_0.6.2    ggplot2_1.0.0    devtools_1.5
    
    loaded via a namespace (and not attached):
     [1] assertthat_0.1   bitops_1.0-6     caTools_1.17     colorspace_1.2-4 DBI_0.3.0        digest_0.6.4     evaluate_0.5.5   formatR_0.10     grid_3.1.0
    [10] gtable_0.1.2     htmltools_0.2.4  httpuv_1.3.0     httr_0.5.0.9000  jsonlite_0.9.11  lazyeval_0.1.1   magrittr_1.0.1   MASS_7.3-33      memoise_0.2.1
    [19] munsell_0.4.2    parallel_3.1.0   proto_0.3-10     Rcpp_0.11.2      RCurl_1.95-4.3   reshape2_1.4     RJSONIO_1.3-0    scales_0.2.4     shiny_0.10.1
    [28] tools_3.1.0      whisker_0.3-2    xtable_1.7-3
    

    最佳答案

    为了使ggvis和export_工具正常工作,需要固定一些移动的目标。

    Vega 2+系列发行版不接受用于vg2XXX命令的json ggvis生成(用于导出),因此vega需要固定到v1.5.4,这是v1系列的最后一个。问题是nodejs 4.x +不会安装[email protected],并且需要较新的vega版本。幸运的是,我们可以使用node version manager(nvm)将 Node 版本固定到 Node 0.12.7,这允许我们安装vega。

    什么是PITA,是吗?如果在可编写脚本的容器(例如Rocker容器)环境中执行此操作,则将更加容易。我一直在使用Rstudio设置,其中包括this包含这些相关行的dockerfile ...

    RUN \
    # Vega 2 doesn't accept the json ggvis generates when trying to use vg2XXX
    # commands so vega needs to be pinned. nodejs 4.x wont install [email protected]...
    mkdir .local/lib/nvm; \
    ln -s .local/lib/nvm .nvm; \
    wget -qO- https://raw.githubusercontent.com/creationix/nvm/v0.29.0/install.sh | bash; \
    . .nvm/nvm.sh; \
    sudo bash -c ". .nvm/nvm.sh;\
     nvm install 0.12.7;\
     nvm alias default 0.12.7;\
     npm install --silent [email protected];"; \
    ln -s -t ~/.local/bin ~/node_modules/vega/bin/*
    

    09-19 17:59