15. Defined Adverbs
Names may be assigned to adverbs, as they are to nouns and verbs:
a=:1 2 3 4 5 prefix=: < prefix 'abcdefg' +-+--+---+----+-----+------+-------+ |a|ab|abc|abcd|abcde|abcdef|abcdefg| +-+--+---+----+-----+------+-------+ +/ prefix a 1 3 6 10 15
Moreover, new adverbs result from a string of adverbs
(such as /) and from a conjunction
together with one of its arguments.
Such adverbs can be defined by assigning names. Thus:
IP=: / NB. Insert Prefix
+ IP a
1 3 6 10 15
with3=: &3
% with3 a
0.333333 0.666667 1 1.33333 1.66667
^ with3 a
1 8 27 64 125
I=: ^: _1 NB. Inverse adverb
*: I a
1 1.41421 1.73205 2 2.23607
+ IP I 1 3 6 10 15
1 2 3 4 5
ten=: 10&
^. ten 5 10 20 100
0.69897 1 1.30103 2
#. ten 3 6 5
365
from=: -~
into=: %~
10 into 17 18 19
1.7 1.8 1.9
10 from 17 18 19
7 8 9
i=: "_1 NB. Apply to items
{. i i. 3 4
0 4 8
Exercises
| 15.1 | Experiment with, and explain the behaviour of, the adverbs pow=: ^& and log=: &^. |
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| 15.2 | State the significance of the following expressions, and test your conclusions by entering them:
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