Ranges
Intermediate Julia
Anthony Markham
Quantitative Developer
Ranges - UnitRange
- A
rangeis an object, with its own data type. - To create a range, we specify a start and stop, both of which are inclusive.
my_range = 1:10 # start:stop
- Printing a
rangewill not reveal the sequence of values stored within the object!
my_range = 1:10
println(my_range)
1:10
- The UnitRange is the most basic type of range.
Ranges - StepRange
- To create a StepRange, we specify a step value, where each element in the range is determined by the step.
my_range = 0:10:50 # start:step:stop
- The
stepvalue determines what the next value in the range will be.
Ranges - StepRange definition
- Our defined StepRange has:
- a
startvalue of one - a
stepvalue of 10 - an
endvalue of 50
- a
my_range = 1:10:50
println(my_range)
1:10:50
Ranges - for iteration
- Unpack the values in a range by iterating over the range
- A
forloop can accomplish this, just as we did with a vector
my_range = 0:10:50
for value in my_range
println(value)
end
0
10
20
30
40
50
Ranges - access
- Ranges can be accessed by element, just like vectors.
start,step, andstopcan be used to get the corresponding values for a range.
my_range = 0:10:50
println(my_range[2])
10
Ranges - access
- Ranges can be accessed by element, just like vectors.
start,step, andstopcan be used to get the corresponding values for a range.
println(my_range.start)
println(my_range.step)
println(my_range.stop)
0
10
50
Ranges - while iteration
- Iterating using a
whileloop requires accessing each individual range element. - Ranges use the
[]notation to access each element, just like vectors. - Note we set
i = 1as Julia starts indexing at 1, not 0!
i = 1
while i <= length(my_range)
println(my_range[i])
i = i + 1
end
Ranges - splat unpacking
- Splat operator
...used to unpack an iterable.
my_range = 0:10:50
println([my_range...])
[0, 10, 20, 30, 40, 50]
- This is only one simple use case for the splat operator.
Let's practice!
Intermediate Julia
