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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。
2 r- o2 ~; O& ` {% a% n# Bnetlogo自带的social science--traffic grid这一例子当中,3 F6 l9 v3 H& @/ s' O4 q
globals2 l' w; J4 }* P. M; L( c( b
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" ~; d) T, h" B7 K" u2 d# w4 G! R grid-x-inc ;; the amount of patches in between two roads in the x direction: V' J" {9 [( q1 o0 G, f
grid-y-inc ;; the amount of patches in between two roads in the y direction3 m' X; y6 O2 T% C' P; l4 B
acceleration ;; the constant that controls how much a car speeds up or slows down by if
u3 z6 X1 I7 Q- A7 v7 ?, Q ;; it is to accelerate or decelerate
# s* @5 i5 w0 y! J# ^: K/ S phase ;; keeps track of the phase
. F* k7 i' P. i: ?) x2 X9 i3 M/ v. Z num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
9 L% n$ j2 G7 w( R current-light ;; the currently selected light9 E6 B1 { t, T2 G( s6 J
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;; patch agentsets6 Z! e- @: G2 u# j4 _$ r5 z4 H
intersections ;; agentset containing the patches that are intersections0 d2 V5 G! ]) @ ?9 T0 t6 O& P
roads ;; agentset containing the patches that are roads6 p5 u, H; O$ q& L( e$ E
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turtles-own
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speed ;; the speed of the turtle/ p* F# F0 q+ u; G7 e; K0 M
up-car? ;; true if the turtle moves downwards and false if it moves to the right" L8 H+ |& Y) q/ y# m
wait-time ;; the amount of time since the last time a turtle has moved( |& U5 O- _, [, L
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# q! R* i4 g5 w5 Ipatches-own
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8 D* l7 U& \1 z# i intersection? ;; true if the patch is at the intersection of two roads# J4 P- e2 g/ l$ x, n
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
7 n. g) O2 k5 N, T( |" K2 w ;; false for a non-intersection patches.- |" S. P3 v/ x# P
my-row ;; the row of the intersection counting from the upper left corner of the
$ k2 J8 [! J& ^+ I2 k5 V ;; world. -1 for non-intersection patches.: F9 G7 {3 u O3 n! l& {
my-column ;; the column of the intersection counting from the upper left corner of the, v: S" T7 s0 o. k* C
;; world. -1 for non-intersection patches.
, d0 |6 X, e1 u' F. ]5 A \1 k' C- C+ X my-phase ;; the phase for the intersection. -1 for non-intersection patches.
) A+ Y) K$ L* Y S% Z' a auto? ;; whether or not this intersection will switch automatically.
! N% S9 B" W; a1 ]0 | V ;; false for non-intersection patches.
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! N8 C4 z! |1 a* a& O2 W;;;;;;;;;;;;;;;;;;;;;;) n* v- \" `& G8 I
;; Setup Procedures ;;
9 P* n' c3 _% p5 G- ?;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.0 o6 p4 K# m: P: ^7 X, J
;; Create num-cars of turtles if there are enough road patches for one turtle to
+ B4 B9 B/ W3 s6 v/ W4 J* b* m;; be created per road patch. Set up the plots.+ L6 z% d1 ]- B0 _' k3 C* Q
to setup
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setup-globals
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q {9 H+ |( g! h8 r ;; First we ask the patches to draw themselves and set up a few variables
7 J8 _* L# s- w) J& n& W8 F) U setup-patches) k* g7 W( ]% g' r6 p# O' G
make-current one-of intersections, f9 Q) X$ s) P4 ^ P+ e3 @) N. v
label-current
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set-default-shape turtles "car"
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if (num-cars > count roads)2 s0 T, A3 Q3 V3 [
[
- n! T/ w: N0 q( o3 G& q user-message (word "There are too many cars for the amount of "
6 Q i+ A# N; _, x "road. Either increase the amount of roads "
2 Q, R2 B& t! U# \- N6 u "by increasing the GRID-SIZE-X or "4 a/ R4 }( D y9 \$ [- E
"GRID-SIZE-Y sliders, or decrease the "% P2 A8 y+ C9 q, v' t8 Y: f
"number of cars by lowering the NUMBER slider.\n"" z: o' H6 c2 j3 F5 `
"The setup has stopped.")' L6 h) h: N: S0 l+ M8 T) J* _! X0 o2 t
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color! q7 L! h; B3 s* J( \
crt num-cars$ D* {; w7 x2 p, B/ @; V
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setup-cars! |, ^( W* k) @6 H( r$ u0 t) u& U
set-car-color1 |8 Z/ S7 {+ [9 j7 |7 V
record-data
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;; give the turtles an initial speed ~; `; T& }, Y. k- D# }
ask turtles [ set-car-speed ]
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9 u7 B0 |9 u& ^1 W8 Z' z( P. b: ] reset-ticks S: S; E) n6 ]. S: K8 a7 w
end
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A5 c& m8 Z$ h& ^& k9 a+ T8 U: A' E;; Initialize the global variables to appropriate values
E6 u. M1 d4 \; `to setup-globals
& \9 R& N$ {0 e- l* g7 a" H4 {. k set current-light nobody ;; just for now, since there are no lights yet
# D6 j% A3 |6 K* D! E set phase 0
' l4 p8 e) ?! V, [7 K! G! Z set num-cars-stopped 0* ?1 A4 O8 H( t) t1 @
set grid-x-inc world-width / grid-size-x
9 {: y- F& @; Y r. K% Q set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary: O" l9 _' d4 `$ R, C6 }1 r& k# I
set acceleration 0.099
/ j! `9 ?3 i7 a; D l8 I4 qend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,/ e# h1 i4 y7 ]' M
;; and initialize the traffic lights to one setting
" w* p; d1 b/ c& Pto setup-patches: }; Y" P6 \( O! z# }" E3 z
;; initialize the patch-owned variables and color the patches to a base-color
' L6 E- i* P; H ask patches) v6 W2 y1 n2 k( I! y5 E: o; @
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# p" m8 }+ b, a5 @" ] set intersection? false- N+ A+ |6 V# h. X, Z2 k+ F) g
set auto? false
1 N+ y* l$ J6 r( H7 N9 |# ~ set green-light-up? true
6 M& R3 K' c: G9 J$ }' r9 t set my-row -1
: W; X0 t B8 p/ E' {) } set my-column -1
1 y) V' e/ w3 n+ i5 a" r3 G8 s set my-phase -1
8 _) A* d; Z4 F/ C$ y set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets) q5 q" H D) r# h. y2 O3 S
set roads patches with7 {, v5 I8 j# x$ |
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
" A2 M/ Y6 J9 q3 ?% b (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& `; g. I; @) b( a. g4 z
set intersections roads with
. k' O; \% |4 n1 J [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
. k% S& H" ]; s6 z2 k (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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7 o, `# u$ L. w. E ask roads [ set pcolor white ]1 `9 [& D& n) w2 E5 ?' O0 B0 Y5 ~7 T$ _
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?2 S: i2 m9 y6 C) Q) Y' T
set roads patches with
+ I( E# F p+ u) N. X* m0 C6 w& | [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or d* u, j7 S/ Q( u- I/ X# D
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 w( {' `5 V# O6 i% a7 M5 f
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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