You might also want to think about using BitVectors to store the
information about whether a person was infected, vaccinated, or deceased
(which would take only 3 bits per person), and then you could easily
perform operations to find out the number of people infected, etc. using
the bit vectors.
On Saturday, June 4, 2016 at 10:48:29 AM UTC-4, Christopher Fisher wrote:
>
> Thank you for your help.
>
> So my basic goal is to be able to perform operations on the individual and
> population level. In this case, population.infected would return an
> Array{Int64,1} indicating which individuals in the population are infected.
> For example, population.infected[1] = 1 would indicate the first
> individual is infected. Something like mean(population.infected .== 1)
> would indicate the percentage infected in the population. Similarly, if I
> queried population[1], this would allow me to inspect all of the properties
> assigned to individual 1.
>
> Does that make sense?
>
> On Saturday, June 4, 2016 at 10:26:52 AM UTC-4, Ford Ox wrote:
>>
>> Could you please specify what should population.infected return? Could
>> you provide an interface?
>>
>> Right now it seems like you want something like this:
>>
>> type Individual end
>>
>> type Population
>> individuals::Vector{Individual}
>> end
>>
>> setindex!(p::Population, i::Individual, index...) = p.individuals[index
>> ...] = i
>> getindex(p::Population, index) = p.individuals[index]
>> infected(i::Individual) = i.infected
>> vaccinated(i::Individual) = i.vaccinated
>>
>> Usage:
>> population[index] = Individual() # set new individual
>> infected(population[index]) # gets the infected property of
>> individual at index
>> vaccinated(population[index]) # ...
>>
>> But you don't really need functions for these things...
>>
>>
>> On Saturday, June 4, 2016 at 2:19:02 PM UTC+2, Christopher Fisher wrote:
>>>
>>> I was wondering if someone would be willing to help me with creating
>>> user-defined types. I've been using Julia for about two years now but I am
>>> new to the idea of creating custom types. I'm trying to create a population
>>> of agents/individuals in a simple epidemiological simulation. I would like
>>> the population of individuals to be structured as a 2 dimensional array
>>> with rows as individuals and columns as properties. This would be somewhat
>>> similar to a DataFrame, but potentially more flexible. I want to be able to
>>> index an individual like so: population[1]. This woud list all of the
>>> information for individual 1. I would also like to be able to look at an
>>> attribute across individuals: population.infected or population[:infected].
>>> At the same time, I would like to have to flexibility of using an array to
>>> keep track of individuals: typeof(population.history[1]) is Array{Int64,1}.
>>> Based on existing documentation and examples, I have only been able to
>>> create individuals but cannot figure out how to create a population as
>>> described above:
>>>
>>> type Person
>>> infected::Int64
>>> vaccinated::Int64
>>> dead::Int64
>>> history::Array{Int64,1}
>>> end
>>>
>>> Any help would be greatly appreciated.
>>>
>>
