Hi,
I know several programming languages, but I am still new to J, and the whole
style of programming is alot different to what I am used too, but I am
finding it extremely interesting, as it makes me think of ways to solve
problems differently to what I normally do.
I keep running into the same problem over and over again (probably because I
have spent so long with 'standard' programming languages), and that is
writing a script that doesn't use explicit loops.
Even though I have solved the problem I was trying to solve in J, I would
like to do it without using a loop like I did.
I have simplified my problem to try and explain what I am trying to do.
a=. 1 2 3 4 5
b=. 1 2
I want to be able to add each of the values in 'b' with each of the values
in 'a', then sum them up
for example
(a[0]+b[0]) + (a[1]+b[0]) + (a[2]+b[0]) +(a[3]+b[0]) + (a[4]+b[0]) ) = 2
3 4 5 6 = 20
which is (1+1) + (2+1) + (3+1) + (4+1) + (5+1) = 20
(a[0]+b[1]) + (a[1]+b[1]) + (a[2]+b[1]) +(a[3]+b[1]) + (a[4]+b[1]) ) = 3
4 5 6 7 = 25
which is (1+2) + (2+2) + (3+2) + (4+2) + (5+2) = 25
total = 20 + 25 = 45
The way I solved it was with
loop =. 4 : 0
counter=.0
sum=.0
while. counter < #y
do. sum=. sum + (+/ ((counter { y) + x))
counter=.counter+1
end.
sum
)
a loop b
but I don't like this method, and would like to find a more direct approach
without using the program control flow
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