Ranges come in handy when you have to work with an interval of numbers, for example, one up to thousand: 1:1000
. The type of this object, typeof(1:1000)
, is UnitRange{Int64}
. By default, the step is 1
, but this can also be specified as the second number; 0:5:100
gives all multiples of 5
up to 100
. You can iterate over a range, as follows:
# code from file chapter2\arrays.jl
for i in 1:2:9
println(i)
end
This prints out 1
, 3
, 5
, 7
, 9
on consecutive lines.
In the previous section on Strings, we already encountered the array type when discussing the split
function:
a = split("A,B,C,D",",")typeof(a) #> Array{SubString{String},1}show(a) #> SubString{String}["A","B","C","D"]
Julia's arrays are very efficient, powerful, and flexible. The general type format for an array is Array{Type, n}
, with n
number of dimensions (we will discuss multidimensional arrays or matrices in Chapter 6, More on Types, Methods, and Modules). As with the complex type, we can see that theArray...