Passing two arrays in a function - julia

Question

I am trying to work with 2 arrays in a function with a for loop but I do not know the syntax, since there are no examples in the internet. I have written the code without function but I would certainly appreciate if this was transformed to a function. The output is the array price and the array succrate. Thank you in advance.
length_of_arrays = 101
lower_limit = 0
steps_per_unit = 1
price1 = 10
succrate1 = 5
succrate2 = 7
price = Array{Float64, 1}(101)
succrate = Array{Float64, 1}(101)
for pr_A = 1:1:length_of_arrays
price[pr_A] = lower_limit + ((pr_A-1) / steps_per_unit)
if price[pr_A] == price1
succrate[pr_A] = succrate1
else
succrate[pr_A] = succrate2
end
end

Answer 1

There is no special syntax for passing in arrays. Just pass them as an argument like anything else. The arrays will be modified in the function (to mark this I have followed a convention of using a final ! in the name) so there's no need to return them from the function.
function calc_prices!(price, succrate, lower_limit, steps_per_unit, price1, succrate1, succrate2)
for pr_A in eachindex(price)
price[pr_A] = lower_limit + ((pr_A-1) / steps_per_unit)
if price[pr_A] == price1
succrate[pr_A] = succrate1
else
succrate[pr_A] = succrate2
end
end
end
len_of_arrays = 101
pri = Array{Float64, 1}(len_of_arrays)
succ = Array{Float64, 1}(len_of_arrays)
calc_prices!(pri, succ, 0, 1, 10, 5, 7)
println(pri[10])
println(succ[10])

Answer 2

I used for i in 1:length_of_array, since eachindex in nested for loops produced a bounds error
function modifyarrays!(length_of_arrays, price, lower_limit, steps_per_unit, succrate)
for pr_A in 1:101
price[pr_A] = lower_limit + ((pr_A-1) / steps_per_unit)
for d in 1:20
if price[pr_A] == price1
succrate[pr_A, d] = succrate1
else
succrate[pr_A, d] = succrate2
end
end
end
end
length_of_arrays = 101
lower_limit = 0
steps_per_unit = 1
price1 = 10
succrate1 = 5
succrate2 = 7
price = Array{Float64, 1}(101)
succrate = Array{Float64, 2}(101,20)
modifyarrays!(101, price, 0, 1, succrate)
println(succrate[11, 2])
I would be happy to get an answer on how eachindex could have worked or about cartesian index.
In addition, how do I call succrate from the modifyarrays! function into another function?