Hi Christopher,
You are right, there are not many examples out there of using Julia for
agent based models, at least as far as I can see.
I am not sure if you know about this one, but in the excellent QuantEcon
website, they give an example of Schelling's model of segregation with some
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
You might be right. I previously coded a simple simulation similar to what
you described. In this simulation, individuals were stored in a vector
and their properties were represented as integers (e.g. recovered: 3,
infected: 1, not infected: 0 etc.). I used an adjacency matrix to represent
El sábado, 4 de junio de 2016, 18:18:00 (UTC-4), Christopher Fisher
escribió:
>
> Ok. I didn't anticipate this would be a drawn out process. I just Ford's
> suggestion fixed the issue of changing values but recreated the problem of
> accessing an individual's information like so:
Ok. I didn't anticipate this would be a drawn out process. I just Ford's
suggestion fixed the issue of changing values but recreated the problem of
accessing an individual's information like so: population[2] .
population[:,2] did not work either. I tried other changes to the syntax
but to
Got it. Thanks for clarifying.
On Saturday, June 4, 2016 at 5:49:39 PM UTC-4, Steven G. Johnson wrote:
>
>
>
> On Saturday, June 4, 2016 at 5:05:47 PM UTC-4, Christopher Fisher wrote:
>>
>> Thanks Ford. Is there a reason you discourage using symbols? I opted for
>> the symbols partly because I
On Saturday, June 4, 2016 at 5:05:47 PM UTC-4, Christopher Fisher wrote:
>
> Thanks Ford. Is there a reason you discourage using symbols? I opted for
> the symbols partly because I couldn't get your example to work. So I
> combined code from the various answers until something worked.
>
> I
Thanks Ford. Is there a reason you discourage using symbols? I opted for
the symbols partly because I couldn't get your example to work. So I
combined code from the various answers until something worked.
I also noticed some odd behavior with the present implementation and I
think its part of
El viernes, 3 de junio de 2016, 16:40:50 (UTC-4), Adrian Salceanu escribió:
>
> Hi,
>
> I have released PkgSearch, a small REPL utility for package discovery.
>
>
Very nice work!
> Package discovery seemed to be a recurring issue, with many related
> questions - and I can still remember
This looks awesome, thanks for tackling this. I'll post over at your repo
about any issues I notice.
Best,
--Tim
On Friday, June 3, 2016 1:40:50 PM CDT Adrian Salceanu wrote:
> Hi,
>
> I have released PkgSearch, a small REPL utility for package discovery.
>
> Package discovery seemed to be a
Right, but perhaps that prior about "I'm probably not the first person ever to
have thought about this" could be bumped up a notch or two. I'm not saying
there aren't things that need fixing (there are many, it's why julia is still
being actively developed), but at this stage julia is not brand
Hi, thanks very much for the feedback, much appreciated.
1. good point, haven't considered that as package names don't have spaces.
But nonetheless, a search with spaces should definitely be all right.
I fixed the issue and pushed on GitHub - it now considers whitespace as a
keyword
I would like to discourage you from passing symbols as an array index but I
guess you gonna do it anyway...
So if you really want it, here it is:
setindex!(p::Population, value, field::Symbol, index...) = p.individuals[
index...].(field) = value
getindex(p::Population, field::Symbol, index...)
Thanks everyone for your helpful suggestions. Although a few details seem
fuzzy, I think I am learning quite a bit and I am very close to the final
product.
Combining Ford's initial code, Steve's code and David's code allowed me to
access the information from specific individuals (e.g.
FWIW
[individual.infected for individual in population] #list of all infected
individuals
typealias Population Vector{Individual}
population = Population(0)
On Saturday, June 4, 2016 at 4:48:29 PM UTC+2, Christopher Fisher wrote:
>
> Thank you for your help.
>
> So my basic goal is to be
I have this on my mind, so 75% of my ideas / questions don't make it to
this forum.
On Saturday, June 4, 2016 at 5:02:19 PM UTC+2, Steven G. Johnson wrote:
>
> On Saturday, June 4, 2016 at 4:31:55 AM UTC-4, Ford Ox wrote:
>>
>> I know that I have close to zero experience in julia compared to
Because `for i = 1:10` is pretty clear but `for i = v` looks like it's
assigning `v` to `i` rather than assigning each value in `v` to `i`. The
recommended practice is to use `=` when the RHS is a range and `in` when
the RHS is a value.
On Sat, Jun 4, 2016 at 12:25 PM, Ford Ox
If for i=1:10 is less verbose than for i in 1:10, why do we keep the second
version around?
You can define a `Population` type and overload `getindex` for it to do
what you want, something like:
type Person
infected::Bool
vaccinated::Bool
dead::Bool
history::Vector{Int}
end
type Population <: AbstractArray
individuals::Vector{Person}
end
Population() =
Thanks for your suggestions Steven. You are correct. I could many of those
fields as Boolean and maybe there is a reason to prefer that rather than
using 1 and 0s.
Initially, I also tried to push the individuals into an empty array as you
suggested. This worked well, except I was not able to
On Saturday, June 4, 2016 at 4:31:55 AM UTC-4, Ford Ox wrote:
>
> I know that I have close to zero experience in julia compared to you.
> That's why I created this thread, because *discussion* doesn't *damage *
> anything.
>
No, but uninformed discussion can waste people's time, and decreases
Just synchronized the julia versions to the exact commit number (using `git
checkout 430601c` on my laptop). The problem still persists. I wonder if I
should just open an issue on github and move the conversation there. I just
wanted to make sure I wasn't making an obvious mistake with the
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
On Saturday, June 4, 2016 at 8:19:02 AM UTC-4, 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
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...) =
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
Hi, this looks great. Two comments from playing around a little bit.
1) PkgSearch.lookup fails if any of the arguments contain a space. In
general maybe add to the documentation some notes about whitespace, case
sensitivity, etc.?
2) The search seems to get confused between package names and
On Friday, June 3, 2016 5:48:24 PM CDT Ethan Anderes wrote:
> I just checked and the package versions are the same (v0.1.8). However, the
> julia versions on my laptop is slightly different from what is on the
> server (Version 0.4.6-pre+37 vrs Version 0.4.6-pre+36). Is that a problem?
Very
So, @everywhere Pkg.build("Dierckx") didn’t help, and Fortran is working
fine on the servers (recall that the code works fine when the workers are
launched from the server with addprocs(2)). However, just to rule out
anything having to do with Fortran I decided to test a few code
>
> In Julia 0.5, [1, 2, 3] and [1; 2; 3] do not mean the same thing
>
That means that 'classic' way of doing arrays is available in 0.5? (I have
0.45 and both mine and your example don't work there)
a = [[1, 2, 3, 4], [9, 8, 7, 6]]
a[0][0]
> 9
Syntax 3 is not available since it already
I've sometimes also wished for an imperative version of Reactive, but Shashi
has pointed out some pretty serious advantages of a declarative approach. My
favorite is `throttle`, which allows you to make many separate updates to
various `Signal`s and yet allow some operation that depends on all
That may cause recompilation to happen. Do you also have the Fortran
library installed on all machines? If not,
@everywhere Pkg.build("Dierckx")
may help.
On Friday, June 3, 2016 at 5:48:24 PM UTC-7, Ethan Anderes wrote:
>
> Hi Tim:
>
> I just checked and the package versions are the same
And where exactly did you install Julia from? The
staticfloat/homebrew-julia tap, the OSX binaries, homebrew-cask (which
should be the same as the OSX binaries), source build, etc?
On Friday, June 3, 2016 at 2:55:21 PM UTC-7, Stefan Karpinski wrote:
>
> What BLAS library are you using? I.e.
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