如何在R语言中提取赋值给变量的绘图代码及内容？

Hey there! Great question—when you assign a lattice plot (like your wireframe output) to a variable in R, you’ve got a few straightforward ways to inspect the underlying code, parameters, and content of that plot object:

• View the original plot call
  Lattice plot objects store the original function call that created them. You can access this directly with:

  myplot$call
  

  This will return the full wireframe() expression you used to create myplot, including most of the parameters you set (like xlab, drape, scales, etc.). Note that if you had any incomplete code (like the z = ... in your example), that part will show up as-is in the call.

• Inspect the full structure of the plot object
  To dive deeper into every component of the plot (data, parameters, scales, colors, etc.), use the str() function. Adding max.level helps keep the output manageable:

  str(myplot, max.level = 2)
  

  This will show you nested lists for things like scales, axis labels, the data used for plotting, and more—perfect if you want to tweak specific parts later or verify settings.

• Access individual plot components directly
  Since lattice plot objects are structured like lists, you can pull out specific parameters or data by name:

  # Get the x-axis label
  myplot$xlab
  
  # Retrieve the scales configuration
  myplot$scales
  
  # Access the data used for the plot
  myplot$data
  

• Use getCall() for a cleaner call representation
  If myplot$call feels a bit messy, try the getCall() function—it returns a cleaned-up version of the original call:

  getCall(myplot)
  

One quick note: Unlike base R plots, lattice plots are stored as objects, so you’re not just saving a "picture"—you’re saving the entire blueprint of the plot, which makes it easy to inspect, modify, or re-render later.

内容的提问来源于stack exchange，提问作者jeffgoblue