Drop support for NMatrix

Because it's not maintained.

Author: kou

Diff for: .github/workflows/nmatrix.yml

@@ -240,7 +240,7 @@ end
 bar.render("sample_images/bar_pyplot.png")
 ```
 
-Charty also supports Daru::DataFrame, Numo::NArray, NMatrix and ActiveRecord as Data Abstraction Layer.
+Charty also supports Daru::DataFrame, Numo::NArray and ActiveRecord as Data Abstraction Layer.
 For example.
 
 ```ruby
@@ -260,12 +260,6 @@ narray = Numo::DFloat.new(3,5).seq
 charty.table = narray
 
 
-### when NMatrix
-require "nmatrix"
-nmatrix = NMatrix.new([3, 4], [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11], dtype: :int64)
-charty.table = nmatrix
-
-
 ### when ActiveRecord
 require "active_record"
 ActiveRecord::Base.establish_connection(adapter: "sqlite3", database: ":memory:")

Diff for: README.md

@@ -42,9 +42,6 @@ def render(figure)
           when ->(x) { defined?(Numo::NArray) && obj.is_a?(Numo::NArray) }
             visit_array(obj.to_a)
 
-          when ->(x) { defined?(NMatrix) && obj.is_a?(NMatrix) }
-            visit_array(obj.to_a)
-
           when ->(x) { defined?(Numpy::NDArray) && obj.is_a?(Numpy::NDArray) }
             visit_array(obj.to_a)
 

Diff for: lib/charty/backends/plotly_helpers/plotly_renderer.rb

@@ -504,6 +504,7 @@ def line(x, y, variables, color:, color_mapper:, size:, size_mapper:, style:, st
 
         x = x.to_a
         y = y.to_a
+        x = x.collect(&:to_s) if x[0].is_a?(Time)
         lines = ax.plot(x, y, **kws)
 
         lines.each do |line|

Diff for: lib/charty/backends/pyplot.rb

@@ -93,8 +93,6 @@ def to_a(x=nil, y=nil, z=nil)
         table.map(&:to_a)
       when defined?(Numo::NArray) && table.kind_of?(Numo::NArray)
         table.to_a
-      when defined?(NMatrix) && table.kind_of?(NMatrix)
-        table.to_a
       when defined?(ActiveRecord::Relation) && table.kind_of?(ActiveRecord::Relation)
         if z && x && y
           [table.pluck(x), table.pluck(y), table.pluck(z)]

Diff for: lib/charty/table.rb

@@ -21,6 +21,5 @@ def self.find_adapter_class(data)
 require_relative 'table_adapters/datasets_adapter'
 require_relative 'table_adapters/daru_adapter'
 require_relative 'table_adapters/active_record_adapter'
-require_relative 'table_adapters/nmatrix_adapter'
 require_relative 'table_adapters/pandas_adapter'
 require_relative 'table_adapters/arrow_adapter'

Diff for: lib/charty/table_adapters.rb

@@ -30,7 +30,7 @@ def self.array?(data)
         when Charty::Vector
           true
         # TODO: Use vector adapter to detect them:
-        when Array, method(:daru_vector?), method(:narray_vector?), method(:nmatrix_vector?),
+        when Array, method(:daru_vector?), method(:narray_vector?),
              method(:numpy_vector?), method(:pandas_series?)
           true
         else
@@ -46,10 +46,6 @@ def self.narray_vector?(x)
         defined?(Numo::NArray) && x.is_a?(Numo::NArray) && x.ndim == 1
       end
 
-      def self.nmatrix_vector?(x)
-        defined?(NMatrix) && x.is_a?(NMatrix) && x.dim == 1
-      end
-
       def self.numpy_vector?(x)
         defined?(Numpy::NDArray) && x.is_a?(Numpy::NDArray) && x.ndim == 1
       end

Diff for: lib/charty/table_adapters/hash_adapter.rb

@@ -205,7 +205,6 @@ def index=(values)
 require_relative "vector_adapters/arrow_adapter"
 require_relative "vector_adapters/daru_adapter"
 require_relative "vector_adapters/narray_adapter"
-require_relative "vector_adapters/nmatrix_adapter"
 require_relative "vector_adapters/numpy_adapter"
 require_relative "vector_adapters/pandas_adapter"
 require_relative "vector_adapters/vector_adapter"