Formatting and Printing Tables

PV-WAVE Foundation > User Guide > Creating and Querying Tables > Formatting and Printing Tables

The simplest way to print a table is with the command:

PRINT, table_name

Unfortunately, the output from such a statement is not formatted in a readable, presentable manner.

Printing the Table without Column Titles

To print the phone_data table without column headings, simply enter:

WAVE> for i=0,N_ELEMENTS(phone_data)-1 do $ 
begin PRINT, phone_data(i)

This prints a readable, neatly organized representation of the table. The PRINT statement accesses each column of the table directly, using the basic structure notation, which is:

Variable_Name.Tag_Name

For more information on the relationship between structures and tables, see "Tables and Structures".

Printing the Table with Column Titles

To achieve a presentable format with column titles requires a slightly more complicated approach. For example, the following procedure prints a formatted version of the phone_data table to the screen and places titles above each column. The Format keyword in the PRINT statement uses FORTRAN-style format specifiers to format the rows. For detailed information on format specifiers, see the PV‑WAVE Reference.You can also refer to the description of the PRINT function in th PV‑WAVE Reference.

PRO pr_table, t_name

PRINT, ' DATE   TIME    DUR    INIT   EXT '+ $
  '  COST    AREA    NUMBER '

FOR i = 0, N_ELEMENTS(t_name) - 1 do begin

PRINT, Format = '(I6, 1X, I6, 3X, F5.2, 3X, ' + $ 
'A3, 3X, I3, 2X, F5.2, 3X, I3, 3X, A10)', $
t_name(i).DATE, t_name(i).TIME, t_name(i).DUR, $
t_name(i).INIT, t_name(i).EXT, t_name(i).COST, $ 
t_name(i).AREA, t_name(i).NUMBER

ENDFOR

END

After the procedure is compiled with .RUN, the following command prints the formatted phone_table to the screen:

WAVE> pr_table, phone_data

DATE	TIME	DUR	INIT	EXT	COST	AREA	NUMBER
901002	93200	21.40	TAC	311	5.78	215	2155554242
901002	94700	1.05	BWD	358	0.0	303	5553869
901002	94700	17.44	EBH	320	4.71	214	2145559893
901002	94800	16.23	TDW	289	0.0	303	5555836
901002	94800	1.31	RLD	248	0.35	617	6175551999
901003	91500	2.53	DLH	332	0.68	614	6145555553
901003	91600	2.33	JAT	000	0.0	303	555344
901003	91600	.35	CCW	418	0.27	303	5555190
901003	91600	1.53	SRB	379	0.41	212	2125556618
901003	91600	.45	MLK	370	0.12	212	2125557956
901004	94700	.80	JAT	000	0.0	303	555320
901004	94900	1.93	SRB	379	0.52	818	8185552880
901004	95000	3.77	DJC	331	1.02	512	5125551228
901004	95100	.16	GWP	370	0.0	303	5551245
901004	95300	1.36	JAT	000	0.0	303	555320