今日记录

1.

help xy_map
        MAP\XY_MAP [TableName [CubeName]] [/NOGRID] [/TYPE LMV|VLM|...]
 
    Build  an LMV spectra cube and an associated weight image from an XY ta-
    ble (usually produced with the command TABLE).
 
    The input XY table name is given as first input.  If  its  extension  is
    omitted,  ".bat"  table is selected if present, else ".tab" table is as-
    sumed. If the XY table name is omitted, the name used at the  last  com-
    mand call is reused.
    The  output cube (.lmv, .vlm, ...) and the weight image (.wei) names are
    given as second input. If omitted, they share their names  with  the  XY
    table one.
 
    By  default,  data  is gridded with a convolution (general case), unless
    /NOGRID option is invoked (typically when the data is already  regularly
    placed). See subtopic for details.
 
    By default, the spatial grid of the LMV cube will be large enough to use
    all the spectra of the XY table. The pixel size will ensure Nyquist sam-
    pling (i.e. at least 2 pixels per beam). The grid position reference and
    position angle will be taken from the XY table header.  The  convolution
    kernel is a Gaussian of size one-third the telescope beamwidth, the con-
    volution being computed on a limited support (large enough to ensure ex-
    cellent  accuracy). The gridding can be customized with a set of parame-
    ters, see subtopic TUNING for details.
 
    For large datasets, XY_MAP will process the data by slices of  channels.
    This introduces reading, computing, and writing overheads, but there are
    ways to limit those. See subtopic MEMORY for details.
 
    Note that the output LMV cube can be then  analysed  with  the  standard
    GreG  image tools like GO VIEW. However, it is also possible to reimport
    the cube in Class as a set of spectra thanks to the command  ANALYSE\LMV
    (see HELP for details).

　　2.

help symbol
        [SIC\]SYMBOL [X ["Translation"]] [/INQUIRE "Prompt Text"]
 
    This commands defines, lists and deletes symbols.
 
      SYMBOL
        Lists the Symbol table
 
      SYMBOL X
        Gives the translation of the symbol X
 
      SYMBOL X "Translation"
        Defines a new symbol or update the precedent symbol definition.
 
      SYMBOL X /INQUIRE "Prompt Text"
        Inquires  the  definition of a symbol with the specified prompt (for
    interactive session only).
 
    A symbol is an abbreviation of any character string. The symbol transla-
    tions  are substituted to the corresponding symbols when found in a com-
    mand line. In a command line, symbol  TOTO  must  appear  inside  simple
    quotes  (like  'TOTO')  to  be translated, except for the line beginning
    where SIC assumes the first word might be a symbol. A symbol  definition
    may refer to another already defined symbol. The substitution occurs ev-
    erywhere, even within the character strings.
 
    Symbols in FOR-NEXT loops are substituted at compilation time (i.e. when
    the  command  line is written but not yet executed), using their current
    value. In a loop, redefining a symbol which is already  defined  out  of
    the  loop  has no effect since its occurences are substituted before the
    execution of all the commands.
 
    Symbols can be deleted when they are no longer  usefull,  using  command
    DELETE /SYMBOL.

　　3.

help modify fre
MODIFY FREQUENCY
        LAS\MODIFY FREQUENCY Rfreq
 
    Compute  the velocity scale corresponding to a new rest frequency Rfreq.
    The sky frequency scale is not modified. If present, the resolution sec-
    tion is also updated.
计算对应于新的静止频率Rfreq的速度标度。不会修改天空频率比例。如果存在，分辨率部分也会更新。

 4.

file in demo
find
get zero
for i 1 to found
    get next
    plot
    pause
next ient

extract n1 n2 velocity
extract n1 n2 veloctiy /index
set nomatch
set align f c
average
plot

set mode x n1 n2
plot
set mode x total
plot

find /tel telname
load
plot /index

 5.一些常用的命令以及注释

!
!  Saved CLASS parameters
!
LAS\SET ANGLE SEC                                ! Angle unit
LAS\SET ALIGN C I                                ! Align type for adding spectra
LAS\SET BAD O                                    ! Bad channel checking mode
LAS\SET BASELINE  1                              ! degree of polynomial
LAS\SET SYSTEM AUTO                              ! Coordinate system 
LAS\SET FORMAT L                                 ! Default header format
LAS\SET LINE "*           "                      ! Molecular transition
LAS\SET MASK NONE                                ! no fit mask
LAS\SET NOMATCH                                  ! Position match not tested.
LAS\SET MODE X TOTAL                             ! Whole spectrum displayed
LAS\SET MODE Y   -1.000      5.000               ! Fixed mode for Y
LAS\SET NUMBER0 *                                ! Scan number range.
LAS\SET OBSERVED 10-DEC-1934 15-MAY-2114         ! Range of observ. dates.
LAS\SET RANGE   *   *   *   *                    ! Offset range.
LAS\SET PLOT H                                   ! plot type.
LAS\SET REDUCED 10-DEC-1934 15-MAY-2114          ! Range of reduc. dates.
LAS\SET SOURCE "*           "                    ! Source name
LAS\SET TELESCOPE "30M-V01-A100"                 ! Telescope name
LAS\SET TYPE SPECTROSCOPY                        ! Data type
LAS\SET UNIT V                                   ! Unit of x axis (vel. freq. or chan.)
LAS\SET WEIGHT T                                 ! Weight type for summations.
LAS\SET WINDOW