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def row(i, &block) # :yield: e

if block_given?

@rows[i].each(&block)

else

Vector.elements(@rows[i])

end

row_size.times do |i|

yield @rows[i][j]

end

else

col = (0 ... row_size).collect {|i|

@rows[i][j]

# 9 16

#

def collect(&block) # :yield: e

rows = @rows.collect{|row| row.collect(&block)}

new rows, column_size

end

#

def each2(v) # :yield: e1, e2

Vector.Raise ErrDimensionMismatch if size != v.size

size.times do |i|

yield @elements[i], v[i]

end

#

def collect2(v) # :yield: e1, e2

Vector.Raise ErrDimensionMismatch if size != v.size

(0 ... size).collect do |i|

yield @elements[i], v[i]

end

# Like Array#collect.

#

def collect(&block) # :yield: e

els = @elements.collect(&block)

Vector.elements(els, false)

end

# Like Vector#collect2, but returns a Vector instead of an Array.

#

def map2(v, &block) # :yield: e1, e2

els = collect2(v, &block)

Vector.elements(els, false)

end