When you write your custom verbs(functions) should you use the following convention:
convert degrees fahrenheit to celsius.
centigrade =: 3 : 0
t1 =. y - 32
t2 =. t1 * 5
t3 =. t2 % 9
)
Alternatively, I have seen this:
ftoc=:(5 % 9)* (-&*32)
Is it necessary to use 3 : 0 and y in first example.
What general guidelines should one follow?
The multi-line definition is from the Primer and is intended to show how multi-line explicit definitions are defined and how they work with the debugger. It is NOT an example of good programming practice.
With a bit of experience you would write:
f=: 3 : '9%~5*y-32'
f _40 32 212
_40 0 100
This could also be done tacitly (without explicit use of y).
g=: 13 : '9%~5*y-32' NB. get tacit from explicit
g
9 %~ 5 * 32 -~ ]
g _40 32 100
_40 0 37.7778