Class: NumRu::NetCDF

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

Constant Summary collapse

Max_Try = 
100
NCVERSION = 
NetCDF.libvers
@@nc4 = 
false
@@cr_format = 
0

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.clean_tmpfile(path) ⇒ Object 



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# File 'lib/netcdf.rb', line 127

def clean_tmpfile(path)
	  proc {
	     print "removing ", path, "..." if $DEBUG
	     if File.exist?(path)
		File.unlink(path) 
	     end
	     print "done\n" if $DEBUG
	  }
end

.create(filename, noclobber = false, share = false) ⇒ Object 



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# File 'lib/netcdf.rb', line 104

def NetCDF.create(filename,noclobber=false,share=false)
  case(noclobber)
  when false
	noclobber=NC_CLOBBER
  when true
	noclobber=NC_NOCLOBBER
  else
	raise NetcdfError,"noclobber (2nd argument) must be true or false"
  end
  case(share)
  when false
	share=0
  when true
	share=NC_SHARE
  else
	raise NetcdfError,"share (3rd argument) must be true or false"
  end
  
  cmode=noclobber | share | @@cr_format
  nc_create(filename,cmode)
end

.create_tmp(tmpdir = ENV['TMPDIR']||ENV['TMP']||ENV['TEMP']||'.', share = false) ⇒ Object 



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# File 'lib/netcdf.rb', line 139

def NetCDF.create_tmp(tmpdir=ENV['TMPDIR']||ENV['TMP']||ENV['TEMP']||'.', 
 share=false)
   basename = 'temp'
   if $SAFE > 0 and tmpdir.tainted?
	  tmpdir = '.'
   end

   n = 0
   while true
	 begin
tmpname = sprintf('%s/%s%d_%d.nc', tmpdir, basename, $$, n)
unless File.exist?(tmpname)
   netcdf = NetCDF.create(tmpname, true, share)
   ObjectSpace.define_finalizer(netcdf, 
	   NetCDF.clean_tmpfile(tmpname))
   break
end
	 rescue
raise NetcdfError, "cannot generate tempfile `%s'" % tmpname if n >= Max_Try
	 end
	 n += 1
   end
   netcdf
end

.creation_format ⇒ Object 



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# File 'lib/netcdf.rb', line 51

def NetCDF.creation_format
  raise("This method is available only for NetCDF >= 4") unless @@nc4
  case @@cr_format
  when 0
    "TRADITIONAL"
  when NC_64BIT_OFFSET
    "64BIT_OFFSET"
  when NC_NETCDF4
    "NETCDF4"
  when NC_NETCDF4 | NC_CLASSIC_MODEL
    "NETCDF4_CLASSIC"
  end
end

.creation_format=(cmode) ⇒ Object 



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# File 'lib/netcdf.rb', line 34

def NetCDF.creation_format=(cmode)
  raise("This method is available only for NetCDF >= 4") unless @@nc4
  case cmode
  when  0, nil, NC_CLASSIC_MODEL, /^CLASSIC$/i  # classic netcdf ver 3 fmt
    @@cr_format = 0
  when NC_64BIT_OFFSET, /^64BIT_OFFSET$/i
    @@cr_format = NC_64BIT_OFFSET
  when NC_NETCDF4, /^NETCDF4$/i
    @@cr_format = NC_NETCDF4
  when ( NC_NETCDF4 | NC_CLASSIC_MODEL), /^NETCDF4_CLASSIC$/i
    # NetCDF4 but disabling new data models
    @@cr_format = NC_NETCDF4 | NC_CLASSIC_MODEL
  else
    raise ArgumentError, "Unsupported creation mode: #{cmod.to_s}"
  end
end

.nc4? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/netcdf.rb', line 28

def NetCDF.nc4?
  @@nc4
end

.open(filename, mode = "r", share = false) ⇒ Object Also known as: new 



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# File 'lib/netcdf.rb', line 65

def NetCDF.open(filename,mode="r",share=false)
   call_create=false   # false-> nc_open; true->nc_create
   case(mode)
   when "r","rb"                          # read only
	  mode=NC_NOWRITE
   when "w","w+","wb","w+b"               # overwrite if exits
      call_create=true
	  mode=NC_CLOBBER
   when "a","a+","r+","ab","a+b","r+b"    # append if exits
	  if( File.exists?(filename) )
  mode=NC_WRITE
	  else
  call_create=true   #(nonexsitent --> create)
  mode=NC_CLOBBER
	  end
   else
	  raise NetcdfError, "Mode #{mode} is not supported"
   end
   case(share)
   when false
	  share=0
   when true
	  share=NC_SHARE
   else
	  raise NetcdfError, "We can't use the sharing mode you typed"
   end
   omode = mode | share
   if(!call_create)
	  nc_open(filename,omode)
   else
	  nc_create(filename,omode)
   end
end

Instance Method Details

#att_names ⇒ Object 



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# File 'lib/netcdf.rb', line 260

def att_names
  num_att=natts()
  names=[]
  for attnum in 0..num_att-1
	obj_Att=id2att(attnum)    
	names=names+[obj_Att.name]
  end
  return names
end

#def_var_with_dim(name, vartype, shape_ul0, dimnames) ⇒ Object 



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# File 'lib/netcdf.rb', line 169

def def_var_with_dim(name, vartype, shape_ul0, dimnames)
   # Same as def_var but defines dimensions first if needed.
   # Use zero in shape to define an unlimited dimension.
   if (shape_ul0.length != dimnames.length ) then
	  raise ArgumentError, 'lengths of shape and dimnames do not agree'
   end
   dims = []
   dimnames.each_index{ |i|
	  dim = self.dim( dimnames[i] )
	  if ( dim != nil ) then
  # dim exists --> check the length
  if (shape_ul0[i] != dim.length_ul0 ) then
		raise ArgumentError, "dimension length do not agree: #{i}th dim: "+\
		"#{shape_ul0[i]} and #{dim.length_ul0}"
  end
  dims.push(dim)
	  else
  # dim does not exist --> define it
  dims.push( def_dim( dimnames[i], shape_ul0[i] ) )
	  end
   }
   def_var(name, vartype, dims)
end

#dim_names ⇒ Object 



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# File 'lib/netcdf.rb', line 240

def dim_names
  num_dim=ndims()
  names=[]
  for dimid in 0..num_dim-1
	obj_Dim=id2dim(dimid)    
	names=names+[obj_Dim.name]
  end
  return names
end

#dims(names = nil) ⇒ Object

return all if names==nil



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# File 'lib/netcdf.rb', line 218

def dims( names=nil )   # return all if names==nil
   if names == nil
	  dims = (0..ndims()-1).collect{|dimid| id2dim(dimid)}
   else
	  raise TypeError, "names is not an array" if ! names.is_a?(Array)
	  dims = names.collect{|name| dim(name)}
	  raise ArgumentError, "One or more dimensions do not exist" if dims.include?(nil)
   end
   dims
end

#each_att ⇒ Object 



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# File 'lib/netcdf.rb', line 210

def each_att
  num_att=natts()
  for attnum in 0..num_att-1
	obj_Att=id2att(attnum)
	 yield(obj_Att)
  end
end

#each_dim ⇒ Object

Iterators:



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# File 'lib/netcdf.rb', line 194

def each_dim
  num_dim=ndims()    
  for dimid in 0..num_dim-1
	obj_Dim=id2dim(dimid)
	 yield(obj_Dim)
  end
end

#each_var ⇒ Object 



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# File 'lib/netcdf.rb', line 202

def each_var
  num_var=nvars()
  for varid in 0..num_var-1
	obj_Var=id2var(varid)
	yield(obj_Var)
  end
end

#inspect ⇒ Object 



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# File 'lib/netcdf.rb', line 270

def inspect
  "NetCDF:"+path
end

#put_att(attname, val, atttype = nil) ⇒ Object 



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# File 'lib/netcdf.rb', line 165

def put_att(attname,val,atttype=nil)
   put_attraw(attname,val,atttype)
end

#var_names ⇒ Object 



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# File 'lib/netcdf.rb', line 250

def var_names
  num_var=nvars()
  names=[]
  for varid in 0..num_var-1
	obj_Var=id2var(varid)
	names=names+[obj_Var.name]
  end
  return names
end

#vars(names = nil) ⇒ Object

return all if names==nil



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# File 'lib/netcdf.rb', line 229

def vars( names=nil )   # return all if names==nil
   if names == nil
	  vars = (0..nvars()-1).collect{ |varid| id2var(varid) }
   else
	  raise TypeError, "names is not an array" if ! names.is_a?(Array)
	  vars = names.collect{|name| var(name)}
	  raise ArgumentError, "One or more variables do not exist" if vars.include?(nil)
   end
   vars
end