Class: GrADS::Gridded::Variable

Inherits:
Object
  • Object
show all
Defined in:
lib/grads/gridded.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, ctl) ⇒ Variable

Returns a new instance of Variable.



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# File 'lib/grads/gridded.rb', line 45

def initialize (name, ctl)
  @name      = name
  @dim       = ctl.vardims[name]
  @tsize     = ctl.tsize
  @dset      = ctl.dset
  @chunksize = ctl.chunksize
  @offset    = ctl.varoffsets[name]
  @undef     = ctl.undef
end

Instance Attribute Details

#dim ⇒ Object (readonly)

Returns the value of attribute dim.



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# File 'lib/grads/gridded.rb', line 55

def dim
  @dim
end

#dset ⇒ Object (readonly)

Returns the value of attribute dset.



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# File 'lib/grads/gridded.rb', line 55

def dset
  @dset
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/grads/gridded.rb', line 55

def name
  @name
end

#offset ⇒ Object (readonly)

Returns the value of attribute offset.



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# File 'lib/grads/gridded.rb', line 55

def offset
  @offset
end

#size ⇒ Object (readonly)

Returns the value of attribute size.



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# File 'lib/grads/gridded.rb', line 55

def size
  @size
end

Instance Method Details

#[](*argv) ⇒ Object 



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# File 'lib/grads/gridded.rb', line 84

def [] (*argv)
  trng = argv.shift
  buf = CArray.float(*@dim)      
  out = nil
  open(@dset) { |io|
    if tsize(trng) == 1
      each_trange(trng) { |t|
        io.seek(t * @chunksize + offset)        
        buf.load_binary(io)
        out = buf[*argv]
      }
    else
      outlist = []
      i = 0
      bind_ok = false
      each_trange(trng) { |t|
        t * @chunksize + offset
        io.seek(t * @chunksize + offset)
        buf.load_binary(io)      
        obj = buf[*argv].to_ca
        if obj.is_a?(CArray)
          outlist << obj
        else
          outlist << CA_FLOAT(obj)
          bind_ok = true
        end
        i += 1
      }
      if bind_ok
        out = CArray.bind(:float, outlist, 0)
      else
        out = CArray.merge(:float, outlist, 0)
      end
    end
  }
  out[:eq, @undef] = UNDEF
  return out
end

#each_trange(trng = nil) ⇒ Object 



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# File 'lib/grads/gridded.rb', line 57

def each_trange (trng=nil)
  case trng
  when NilClass, FalseClass
    (0...@tsize).each do |t|
      yield(t)
    end
  when Range
    trng.each do |t|
      yield(t)
    end
  else
    t = trng
    yield(t)
  end
end

#to_ca ⇒ Object 



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# File 'lib/grads/gridded.rb', line 123

def to_ca
  return self[]
end

#tsize(trng = nil) ⇒ Object 



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# File 'lib/grads/gridded.rb', line 73

def tsize (trng=nil)
  case trng
  when NilClass, FalseClass
    return @tsize
  when Range
    return trng.to_a.size
  else
    return 1
  end
end