COMMAND TYPE : GRAPHIC
The command draws an histogram or a pie-chart of a numerical, or character field, present in one or more catalogues. Many histogram types are available in this task and they can be selected with 'FORmat' key.
When the user works on numerical value he can select continuum or discrete histogram type using 'HIStogram' verb. The user must use a discrete histogram when the numerical values are used as a 'code'. Working on characters fields only discrete histogram is allowed.
Working with many catalogues the user can superimpose or add-up the values of different catalogues using the 'SUMmarize' flag. When an 'ALL' command is executed the histograms will have the desired aspect. Drawing an histogram at a time with the 'DISplay' command the 'SUMmarize' flag has no effect. The 'YMAx' and 'YMIn' values define the scale of the histogram. When these values are not set the scale is defined by the values of the first histogram drawn. Then when the user needs to draw many histograms, in the same picture, he must draw the highest histogram first.
On a continuum histogram the user can compute statistical parameters and superimpose a gaussian curve with the 'MEAn' and 'GAUssian' verbs. The comparison of two or more histograms can be simple by using the 'NORmalize' flag.
REQUIRED Parameters Verb
|MAXimum||Max value on a numerical 'VAR'|
Example: HIS> BIN 30
FILl Data Parameter
0 - Bars (defaults)
1 - Lines
2 - Lines and symbols
3 - Pie-chart
Example: HIS> FOR 2
Example: HIS> HIS 1
Example: HIS> LIM 1.5 2. 3. 5.5 7. 12. 20.
NORmalized Grid and Display
Example: HIS> NORm 1
PATtern Variable Parameter
Example: HIS>PAT Sa Sb Sc S0 DWARF E OTHER
On character string 'SAMple' can be 0-1. The catalogue string will be displayed with N-th symbol if:
Example: HIS> SUM 1
Example: HIS> VARiable MAG
Example: HIS> YLog 1
Example: HIS> YMAx 120
Example: HIS> YMIN 10
DB_HISTO Summary of the commands
* = must be provided by the user
Command Explanation Ref.
ALL Executes GRI and DIS on all cat. Verb AUToscale Calculates max and min Verb AVErage Evaluates the average of VAR Verb DISplay Displays Data Verb EXIt Exits from task Verb GAUssian Draws a computed gaussian curve Spec GO Executes the task Verb GRId Draws the grid Verb LISt Writes a data file Spec SYStem Returns to VMS Verb TEXt Draws a string of text Verb
---- Set up and selection
ACTive Defines active catalogue Verb * CATalogue Opens a Catalogue Verb CLOse Closes a catalogue Verb CONstrains Sets constraints on active cat. Verb CVAriable Defines cord. variables name Verb DEC Sets Dec. coordinates limits Verb DWIndow Resets window condition Verb DZOom Resets zoom condition Verb LATitude Sets longitude cord. Verb LONgitude Sets latitude cord. Verb RA Sets R.A. coordinate limits Verb SELect Fields listed in LISt Verb WDEc Sets a window in Dec. Verb WLAtitude Sets a window on LAT. Verb WLOngitude Sets a window on LON. Verb WRA Sets a window in R.A. Verb
LIMits Range of VAR Spec * MAXimum Maximum value of VAR Verb MINimum Minimum value of VAR Verb PATterns Strings used in the selection Spec SAMple Type of selection Spec SIZe Size of numerical selection Spec * VARiable Variable used Spec YMAximum Maximum value on Y axis Spec YMInimum Minimum value on Y axis Spec
DGRid Resets default grid values Verb FONt Font type Verb GCOlor Color of the grid Verb HIStog Continuum or discrete histogram Spec LSIze Sets the label size Verb VFOrmat FORTRAN format of labels in X Verb XSTep Sets the number of steps in X Verb YLOg Log. scale in Y Spec YSTep Sets the number of step in Y Verb YVFOrmat FORTRAN format of labels in X Verb
BINs Number of bins Spec COLors Color of the mark Verb FILl Fill histogram bars Spec FORmat Type of histogram Spec MSIze Sets the size of the marks Verb NORmalized Values normalized in the histog. Spec SUMmarize Piled histogram Spec SYMbol Sets the marks type Verb
CLEar Clears graphic device Verb CLS Clears command monitor Verb MONitor Number of rows in command monit. Verb NOWindow Don't draw window box Verb W2 Redraws graphic windows Verb
? List of the commands Verb HELp Help of a command Verb LFOnt Shows available font Verb LUT Shows available colors Verb SHO Shows a parameter value Verb
---- Hard copy
HARd Executes an hard copy Verb HDEvice Defines hard copy device Verb HDImension Defines hard copy dimensions Verb
---- Log file
BREak Sets a break flag Verb DElete Deletes a log file Verb LOAd Loads an existent log file Verb NEXt Continues the load after a BREak Verb REM Writes a string in the log file Verb SAVe Saves current log file Verb