How should Plot preserve the previous configuration?

[kojix2]

• A new instance of GR::Plot is created each time. Previous settings are not obtained. You have to manage it yourself.
• A new instance of GR::Plot is created each time. It refers to the previous settings.
• A new instance of GR::Plot is created. One instance is used repeatedly. Multiple instances may exist at the same time.
• A new instance of GR::Plot is created. One instance is used repeatedly. It is desirable to have only one instance.
• There is an instance that holds the settings out of the Plot instance itself.
• Stop adding class methods to the GR module and make Plot more object-oriented.
• Choose the wrong way to maintain state in the module for some benefit
• None of the above

[kojix2]

So far, I select the first approach for subplot or hold method.

• Settings are not obtained. You have to manage it yourself.

The reason is as follows.

• This approach is easy (for me) to implement.
• You can fine-tune the layout of the figure because you get the actual values.

See https://github.com/red-data-tools/GR.rb/blob/master/examples/fast_multiplot.rb