An attempt at a simplest possible functional programming syntax for simulation model specification using the Fay embedded domain specific language (EDSL) and Javascript compiler.
The following code snippets are under test and might provide a basis for a first FSim.hs. They have mostly been lifted directly from other people’s code in Haskell or ported from other languages.
Ian Ross’s “Fun with Fay” is a literate blog post using Fay and html5 canvas and a timer to display an animated 5 ring oscillator with dynamic graphs.
This seemed like a good example to start with but is too complicated for describing simple simulations.
The stripped-out user interfaceses html5 Options for parameter values. This avoids the FF non-working html5 slider problem.
Work is in progress on the simulation function (loop step? iterate step?) and graph rendering etc.
He also has another blog post on creating a good-looking jquery slider. Unfortunately this is for the Yesod web framework and needs to be ported to Snap TBD.
I have no idea where these parameters came from, it’s merely for illustrative purposes.
testCO2 = temp 4.3
temp f = (-f)/totalF where
lambda0 = 3.2 :: Double -- Plank
totalF = avLambda - lambda0
avLambda = (maxSumF - minSumF)/2
minSumF = foldl (+) 0 (fmap fst lambda)
maxSumF = foldl (+) 0 (fmap snd lambda)
lambda = [waterVapour,lapseRate,clouds,albedo]
waterVapour = (1.48,2.14)
lapseRate = (-0.41,-1.27)
clouds = (0.18,1.18)
albedo = (0.07,0.34)
This is supposed to be literate code so you should be able to cut and paste it into a text editor, save it as
<filename>.js and run it with node.js, ie.</filename>` node <filename>.js
and get an answer of ~1.6 deg. C.