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Default Format ":  _ 1 _ Format

Default output is identical to this monadic case, providing a minimum of one space between columns. For example:
   ]text=: ": i. 2 5
0 1 2 3 4
5 6 7 8 9

   $ text
2 9

   3 + text
|domain error
|   3  +text

   '*#' ,. text
*0 1 2 3 4
#5 6 7 8 9

   ": 'abcd'
abcd

   $ ": ''
0
  x":y produces a literal representation of y in a format specified by x . Each element of x is a complex number w j. d , controlling the representation of the corresponding column of y as follows:

|w specifies the width allocated; if this space is inadequate, the entire space is filled with asterisks. If w is zero, enough space is allocated.

|d specifies the number of digits following the decimal point (itself included only if d is not zero).

Any negative sign is placed just before the leading digit. If w>:0 and d>:0, the result is right-justified in the space. Otherwise (if w<0 or d<0), the result is put in exponential form (with one digit before the decimal point) and is left-justified except for two fixed spaces on the left (including one for a possible negative sign).

The format w+d%10 (or its negation) is obsolescent; e.g. _7.2 instead of _7j2.

See below for boxed arguments.
 		 

   n ; 6j2 ": n=: % i. 2 4
+--------------------------+------------------------+
|   _   1      0.5 0.333333|     _  1.00  0.50  0.33|
|0.25 0.2 0.166667 0.142857|  0.25  0.20  0.17  0.14|
+--------------------------+------------------------+

   (7j2 ": -n) ; (3j2 ": n)
+----------------------------+------------+
|     __  _1.00  _0.50  _0.33|  _*********|
|  _0.25  _0.20  _0.17  _0.14|************|
+----------------------------+------------+

   6j3 0j_6 ": 1r2 ^ 1 1000 *"1 i.5 2
 1.000  9.332636e_302 
 0.250  8.128549e_904 
 0.063  7.079811e_1506
 0.016  6.166381e_2108
 0.004  5.370801e_2710
The fit conjunction (!.) and 9!:10 specify the number of digits for floating-point numbers. For example:
   (": ; ":!.6 ; ":!.4 ; ":!.15) %7
+--------+--------+------+-----------------+
|0.142857|0.142857|0.1429|0.142857142857143|
+--------+--------+------+-----------------+
For a boxed right argument, a two-element left argument specifies position in the display, using 0, 1, and 2 for top/center/bottom, and left/center/right. 9!:16 and 9!:17 specify the default positions. 9!:6 and 9!:7 specify the box drawing characters used.
   x=: 2 3 $ (2 #&.> 1+i.6) $&.> 'abcdef'
   (": x) ,. (2 1 ": x)
+----+-----+------++----+-----+------+
|a   |bb   |ccc   ||    |     | ccc  |
|    |bb   |ccc   ||    | bb  | ccc  |
|    |     |ccc   || a  | bb  | ccc  |
+----+-----+------++----+-----+------+
|dddd|eeeee|ffffff||    |     |ffffff|
|dddd|eeeee|ffffff||    |eeeee|ffffff|
|dddd|eeeee|ffffff||dddd|eeeee|ffffff|
|dddd|eeeee|ffffff||dddd|eeeee|ffffff|
|    |eeeee|ffffff||dddd|eeeee|ffffff|
|    |     |ffffff||dddd|eeeee|ffffff|
+----+-----+------++----+-----+------+

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