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新手,在看netlogo自带的例子时,有几行程序看不懂,希望高手能够指点。
# a' W! n7 v# v7 y! y$ M0 ]netlogo自带的social science--traffic grid这一例子当中,
8 k# L5 h. W7 c9 v8 `6 h$ Tglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction& P- O) ?7 o0 N: _9 ~6 t- \
grid-y-inc ;; the amount of patches in between two roads in the y direction$ s* C7 e; y9 ^6 d2 K
acceleration ;; the constant that controls how much a car speeds up or slows down by if! J" B( B! K1 I
;; it is to accelerate or decelerate3 \0 c0 f) x- g, [
phase ;; keeps track of the phase
& p& S3 a6 N$ \' s4 U8 d1 u1 Z num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
4 C: v5 U0 H( i- ?; i current-light ;; the currently selected light
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;; patch agentsets
8 X% c7 h; E7 u& S; d ^; g intersections ;; agentset containing the patches that are intersections
) F2 _! v3 j, R( h5 q. W+ p6 b roads ;; agentset containing the patches that are roads
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# ]8 w( }" H4 c4 T8 Aturtles-own1 x& _7 ^% B) p1 Y$ V/ X4 b \% n
[
/ S! D* ^9 e3 e& O8 X speed ;; the speed of the turtle' U$ x& ^; R% ]. Q- r. I
up-car? ;; true if the turtle moves downwards and false if it moves to the right
* m/ V( ]/ j5 S* j wait-time ;; the amount of time since the last time a turtle has moved
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. K1 {3 B$ g% H! l0 h) Epatches-own1 i, i8 x& x( d9 w% b: c% c, e
[
) _" T! s' e, `$ @; g1 q intersection? ;; true if the patch is at the intersection of two roads5 f; i$ f! c2 w5 Y4 \- C; n: {
green-light-up? ;; true if the green light is above the intersection. otherwise, false.7 m8 d9 c0 z+ E' L6 I
;; false for a non-intersection patches.
! {( q! v; X( \1 ?8 L b my-row ;; the row of the intersection counting from the upper left corner of the
/ D. l5 j% D* e& z+ | ;; world. -1 for non-intersection patches.! L# w5 K. G; s' I' ~: o/ h7 Q* T: j- U
my-column ;; the column of the intersection counting from the upper left corner of the
f" O. f) j. S, i8 T3 S) t+ x& U ;; world. -1 for non-intersection patches.6 n( ^- D/ G0 v
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
) ^- n4 s% \- f$ A auto? ;; whether or not this intersection will switch automatically.
9 F4 k+ @' j2 x3 \, u ;; false for non-intersection patches.
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3 l: K7 @+ Y" z9 N, e; i;;;;;;;;;;;;;;;;;;;;;;
$ r, O; n- m3 I* ?. o;; Setup Procedures ;;1 B* \; M5 X0 m# Z$ k# t
;;;;;;;;;;;;;;;;;;;;;;$ p, X6 }! D# R% f7 W$ U6 B
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;; Initialize the display by giving the global and patch variables initial values.
" H& d/ B3 R0 v% U;; Create num-cars of turtles if there are enough road patches for one turtle to8 P& X8 c4 \* [8 o6 X
;; be created per road patch. Set up the plots.
/ j* ^( G! M" ~1 `0 nto setup0 B: C0 x2 a7 x
ca
6 {5 f# B3 h6 B: S8 P& k% k- b setup-globals
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% u( d) r' M, _0 @ T ;; First we ask the patches to draw themselves and set up a few variables
5 R9 L4 b1 k S4 D5 g setup-patches
( x0 ~' x8 V6 k make-current one-of intersections( S7 A; J, E/ h7 @9 J
label-current ?" ^+ ?0 H5 |6 t+ t
8 v) {) Y6 x( L7 h: G" q( I set-default-shape turtles "car"2 W3 ?7 _6 t/ v3 h9 v
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of ": s# F, M1 X! W u- s( Z: x
"road. Either increase the amount of roads ". E4 ?' H9 C9 a) F( i$ @7 {
"by increasing the GRID-SIZE-X or ", n8 ?7 ]1 T+ n. t: y) K" E1 k
"GRID-SIZE-Y sliders, or decrease the "9 ?8 m- k8 p3 `$ N% T# ~+ I K
"number of cars by lowering the NUMBER slider.\n"; L. k* ?7 c& A; X" N3 c
"The setup has stopped.")
+ F# Z1 w9 z) k2 x& s stop
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" A& [" s5 |# u# K ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ _5 L' {' J* i& T* N/ N8 Q% N
crt num-cars
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setup-cars/ K) y! R) Q; E F) `; Y v
set-car-color
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;; give the turtles an initial speed
2 ~7 Y- M5 H/ Z' @ {5 ~& S/ e ask turtles [ set-car-speed ]
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- k9 S8 p7 l* p! t3 S reset-ticks
& R4 Y* M6 I H$ Pend
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, b' v3 c @8 o6 O# Q0 g;; Initialize the global variables to appropriate values
- W8 P6 S: ^& O7 ^* k0 j0 zto setup-globals
+ j8 f# X+ s3 G" [: t set current-light nobody ;; just for now, since there are no lights yet8 T" _; ^% G& L4 ?* m
set phase 0
& Q' s3 U1 ^; o& B5 W set num-cars-stopped 0# m F2 Z8 t1 e2 k
set grid-x-inc world-width / grid-size-x
/ W' t, l, J4 ~, M: R set grid-y-inc world-height / grid-size-y. ]7 X0 u% I) B5 G- h( D. V
. i# `/ D# \3 ^# a* @$ D3 t, q. B0 } ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
& P+ @% \3 {/ }, r; @( E/ U set acceleration 0.099' o/ V1 I- y# H
end
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7 E& D/ f" K; W- t0 ?, ?, m9 d: X;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
$ W5 y; \7 o; R2 K: _$ t! E;; and initialize the traffic lights to one setting. m( v! d/ `5 Q
to setup-patches0 R) I! d% i& r, c
;; initialize the patch-owned variables and color the patches to a base-color4 l" [3 ]. z$ u2 y: ~
ask patches) X! {4 W4 K- T, w+ v% H
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set intersection? false7 q7 a: ~2 f: ]+ e; A9 X
set auto? false
2 i1 G$ _, t# ~8 J2 F set green-light-up? true
" S+ j U0 ~ x" F0 c set my-row -12 _; m9 w5 \. A) s) b$ Y! f
set my-column -1
; M0 l: X1 K" }: B) n! t' }5 H set my-phase -1+ |- R3 u. x: m8 k* m
set pcolor brown + 3) C5 M$ c; [. I) h U
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& [$ R+ |# b( d4 H ;; initialize the global variables that hold patch agentsets
5 {7 N; V, V6 b- R) R set roads patches with3 N/ y0 o% A7 o) @
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or2 ~$ K0 D" P b* C5 t! G
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 \7 l8 C4 b( O& T
set intersections roads with
/ r U; F0 _" p9 l1 f+ x, C [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
. V, H$ A0 R# P* N (floor((pycor + max-pycor) mod grid-y-inc) = 0)]% P7 c/ Z, V4 b& T
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ask roads [ set pcolor white ]
' [6 R9 ^) {% W9 k2 Q: n7 D' T) h setup-intersections/ y- B( Y/ T$ F$ q
end' U! w! Z K* s6 d' r
其中定义道路的句子,如下所示,是什么意思啊?
5 q3 ]0 |& Y0 m0 f# a @. b% J set roads patches with: b z. C. f* g3 I6 [
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" n7 J: P, S G+ A (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& J8 u0 V, W: B/ x4 _2 d) X9 @
谁能帮我解释一下[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0)是什么意思吗? |
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