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December 12, 2015 12:19
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Sample matrix with abstraction of rows and columns. This can certainly be improved, it's just to convey an idea.
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#!/usr/bin/ruby | |
class Matrix | |
def initialize(row_headers, col_headers) | |
@row_headers = row_headers | |
@col_headers = col_headers | |
end | |
def [](row, col) | |
data[index(row, col)] | |
end | |
def []=(row, col, val) | |
# data[index(row, col)] = val | |
idx = index(row, col) | |
val.nil? ? data.delete(idx) : data[idx] = val | |
end | |
def row(row) | |
Row.new(self, row) | |
end | |
def column(col) | |
Column.new(self, col) | |
end | |
def each_row | |
@row_headers.each do |idx| | |
yield row(idx) | |
end | |
self | |
end | |
def each_column | |
@col_headers.each do |idx| | |
yield col(idx) | |
end | |
self | |
end | |
def row_headers | |
@row_headers.dup | |
end | |
def col_headers | |
@col_headers.dup | |
end | |
private | |
def index(row, col) | |
# @row_headers.index(row) * @col_headers.size + @col_headers.index(col) | |
"#{row}:#{col}" | |
end | |
def data | |
# @data ||= [] | |
@data ||= {} | |
end | |
end | |
class MatrixPart | |
attr_reader :matrix | |
def initialize(matrix) | |
@matrix = matrix | |
end | |
def [](item) | |
matrix[*indexes(item)] | |
end | |
def []=(item, val) | |
matrix[*indexes(item)] = val | |
end | |
include Enumerable | |
def each | |
each_address do |row, col| | |
yield matrix[row, col] | |
end | |
self | |
end | |
end | |
class Row < MatrixPart | |
def initialize(matrix, row_id) | |
super(matrix) | |
@row_id = row_id | |
end | |
private | |
def indexes(col_id) | |
return @row_id, col_id | |
end | |
def each_address | |
matrix.col_headers.each {|col_id| yield @row_id, col_id} | |
self | |
end | |
end | |
class Column < MatrixPart | |
def initialize(matrix, col) | |
super(matrix) | |
@col_id = col | |
end | |
private | |
def indexes(row_id) | |
return row_id, @col_id | |
end | |
def each_address | |
matrix.row_headers.each {|row_id| yield row_id, @col_id} | |
self | |
end | |
end | |
if $0 == __FILE__ | |
require 'pp' | |
puts "test" | |
m = Matrix.new(%w{a b c}, %w{1 2 3 4}) | |
m["a", "1"] = 123 | |
m["b", "4"] = 123 | |
row = m.row("a") | |
row["1"] = 22 | |
row.each {|x| p x} | |
pp m | |
end |
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