For example, how to write the function g=(x-y)/(x-z)? I know how to write the function with 2 parameters.
1 Answers
One way is to use variable matching:
f =: 3 : 0
'x y z' =. y
(x-y)%(x-z)
)
f 1; 2; 3
0.5
f 1 2 3
0.5
f 1.5; 2; 0.5
_0.5
Another way is to treat your variables as an array v -> x y z and define your function as a series of array operations. For example:
- multiply and add
+/1 _1 0*x y z, - multiply and add
+/1 0 _1*x y z, - divide
%/
This can be written as:
g =: 3 :'%/ F (+/ . *) y'
where F is
1 _1 0
1 0 _1
:
g 1 2 3
0.5
g 1.5 2 0.5
_0.5
You can take this too far and write:
h =: 3 : '((0{y) - (1{y)) % ((0{y) - (2{y))'
but you probably shouldn't.
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