Module: CA::TableMethods

Defined in:
lib/carray/io/table.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#column_names ⇒ Object

Returns the value of attribute column_names.



6
7
8
 
# File 'lib/carray/io/table.rb', line 6

def column_names
  @column_names
end

Instance Method Details

#column(name) ⇒ Object 



22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
 
# File 'lib/carray/io/table.rb', line 22

def column (name)
  if name.is_a?(Integer)
    return self[false, name]
  elsif @column_names
    case name
    when Symbol
      if i = @column_names.index(name) or i = @column_names.index(name.to_s) 
        return self[false, i]
      end          
    when String
      if i = @column_names.index(name) or i = @column_names.index(name.intern) 
        return self[false, i]
      end
    end
  end
  return nil
end

#row(i) ⇒ Object 



40
41
42
43
44
45
46
47
48
 
# File 'lib/carray/io/table.rb', line 40

def row (i)
  keys = @column_names || (0...dim0).to_a
  output = {}
  data = self[i, nil]
  keys.each_with_index do |key, j|
    output[key] = data[j]
  end
  return output
end

#rows(arg) ⇒ Object 



50
51
52
53
54
55
 
# File 'lib/carray/io/table.rb', line 50

def rows (arg)
  table = self[arg, nil].to_ca
  table.extend(CA::TableMethods)
  table.column_names = @column_names
  return table
end

#select ⇒ Object 



57
58
59
60
61
62
63
64
 
# File 'lib/carray/io/table.rb', line 57

def select
  idx = yield(self)
  case idx.data_type
  when CA_BOOLEAN
    idx = idx.where
  end
  return rows(+idx)
end