|
|
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。
$ `* L- s ~- N& enetlogo自带的social science--traffic grid这一例子当中,2 B3 D4 l v$ w3 o- j# m9 @
globals
, r* C9 d2 J3 p) d( b' E7 j[6 {& ?. D' p% R M# z: E
grid-x-inc ;; the amount of patches in between two roads in the x direction
+ l2 w i3 Q+ t% {- K. R; i; y grid-y-inc ;; the amount of patches in between two roads in the y direction3 j. N+ W# [# Y5 B; K+ S8 t% F
acceleration ;; the constant that controls how much a car speeds up or slows down by if+ Y8 i. W( d9 E0 G" y
;; it is to accelerate or decelerate
8 R3 D0 I: y& b2 M, \: _: ` phase ;; keeps track of the phase
2 [4 d* O( {& x$ e8 j: i8 Z num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
7 m6 m# d! r$ u7 x& F current-light ;; the currently selected light
, M& i/ q9 a" B. n/ {
* S& c& y/ G1 R- L( g ;; patch agentsets: h6 M& m7 V* C, p
intersections ;; agentset containing the patches that are intersections
% q* T( J% I; y! v% Q roads ;; agentset containing the patches that are roads3 u! j' M0 A& S8 f4 _5 \ V
]5 b6 B. A. P9 n N3 }* t2 o# Q
# V; _9 [8 f' s! oturtles-own. y( x# q. f3 f3 z% C( j
[; V& u5 I ]# b' s% h6 ~
speed ;; the speed of the turtle
! [' k- ~" v1 t" l up-car? ;; true if the turtle moves downwards and false if it moves to the right: K$ D5 c+ X+ K& Z) z) R9 K
wait-time ;; the amount of time since the last time a turtle has moved
4 S2 f. H/ J6 g! f, I6 ]( g0 b]
% F+ w. N% u0 t+ b8 }% ~- P' z4 J3 h; g
patches-own
, b2 `- g8 N( y[* N$ l2 G- K2 A* _7 R1 o* p- Y: Y
intersection? ;; true if the patch is at the intersection of two roads6 W/ Q% ~; {3 \/ s8 i9 S
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
$ z3 r) Z6 T7 t/ s3 o ;; false for a non-intersection patches.
0 ~: h/ T4 x' l% i my-row ;; the row of the intersection counting from the upper left corner of the
1 t- S" y$ l& }. L& } ;; world. -1 for non-intersection patches.
# [. ?& J& A% o9 N- R6 w. h my-column ;; the column of the intersection counting from the upper left corner of the$ {* n0 d# Y) S! Y* F" C, A6 v5 j
;; world. -1 for non-intersection patches.
. i, `6 f5 e0 X0 Y, @- m my-phase ;; the phase for the intersection. -1 for non-intersection patches.6 g# x0 i1 l; V; S. I
auto? ;; whether or not this intersection will switch automatically.
& a5 V& w+ L8 G* [! f6 t/ `7 M ;; false for non-intersection patches.6 w0 [! Y/ C: s c; `( i( u
] P$ x7 L5 G9 z* \) t* ], e' U2 @$ K! C
: x8 T) r: k* m' Y" v( E
+ l# T, _; b4 V8 s B( \6 t3 C;;;;;;;;;;;;;;;;;;;;;;5 `: t& e$ a* G' [8 E4 C/ x$ }) r
;; Setup Procedures ;;6 W+ k- j7 E, w( o/ u
;;;;;;;;;;;;;;;;;;;;;;
; c! Z* h E& ]! G9 E$ ?" e3 w
9 K' R( ^$ a$ }6 m;; Initialize the display by giving the global and patch variables initial values.) ~- [" Y! i2 A8 ~/ Z
;; Create num-cars of turtles if there are enough road patches for one turtle to! K* u$ e8 i d* \
;; be created per road patch. Set up the plots.: J. L \7 \; z0 R: f
to setup
j/ \3 I5 a6 r5 h8 v ca
j' J5 J& H) R& @3 J! n1 P setup-globals8 w7 W" p) X, y) S5 O
1 N2 C" y s) R; o ;; First we ask the patches to draw themselves and set up a few variables
4 n0 }* y; y( V setup-patches, M A4 w2 B8 u* B" f6 n2 b
make-current one-of intersections
8 X+ X: M3 l, s& ~' U label-current- O/ b# |9 f& K# f3 f6 ~3 K
4 e. e: ]2 X- @9 v8 j set-default-shape turtles "car") p+ g! w" z7 @: s5 ? m5 E% T
! n3 b" U0 L+ y0 I) Z) C9 y" x' k if (num-cars > count roads)
8 G/ O5 [' y% S+ l# R& A" Y2 @7 ? [
" l, A8 c& L _* B8 p user-message (word "There are too many cars for the amount of "; ^9 Q& S; a% E, o9 \
"road. Either increase the amount of roads "
/ ]9 A2 _# B1 p. [7 J "by increasing the GRID-SIZE-X or "3 D9 a. i9 e' t6 _( h5 H
"GRID-SIZE-Y sliders, or decrease the "
t; g" O- U4 e- B! c' j "number of cars by lowering the NUMBER slider.\n"
9 K/ X/ D) ~& I' J* L4 Z "The setup has stopped.")' H0 b& t7 e- w- K8 M
stop
" S& b2 @) W* ~ ]
! \7 a, B% Z% Y1 }
, B# M2 B# |" i+ ], y ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
. d: [2 \$ x3 {. K$ o crt num-cars: k4 H/ N8 |- D8 I+ ^/ s- n
[: e4 u, j' L I
setup-cars' {) N+ D% p: l$ E8 I
set-car-color9 Y; [+ P+ J/ P. D0 x7 @
record-data
6 v3 s' X; c9 r ]
; r8 u1 S9 {+ l+ y6 J3 D( F6 Q2 j( ~3 E
;; give the turtles an initial speed0 F- |$ v0 b" p: r
ask turtles [ set-car-speed ]+ h: x2 Z6 X# F1 G& L4 X; [: }6 y
. i# z& n6 H. D& k4 ?
reset-ticks
5 g2 Z! ]9 L: ~" q% `end5 w4 D( y/ `; `7 B5 x
0 Z3 f- W4 V6 }2 };; Initialize the global variables to appropriate values
. A2 f* H; ?4 l3 E0 Sto setup-globals6 j$ q" u; j l, Z6 O
set current-light nobody ;; just for now, since there are no lights yet. Z) K9 ]. r8 w4 x: T9 u4 l
set phase 0
' J% l) O& s* O7 @/ k! V) b5 r set num-cars-stopped 0
, K D5 P* R" M6 c6 F$ P set grid-x-inc world-width / grid-size-x3 V, w5 f+ }& U4 `* s) _7 q, j
set grid-y-inc world-height / grid-size-y6 b% z5 }/ O4 L
0 r7 ]% s0 |, B+ h. c! K1 f {) a ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
( H# q& @! y0 m$ w3 _9 Y3 m# a; @ set acceleration 0.099
6 M' k2 D& @: d, p/ o y5 m1 y. S0 a# wend
& {, a# ?6 x% g) u( _
0 I. \; t( N; R4 \% x;; Make the patches have appropriate colors, set up the roads and intersections agentsets,6 T7 ^% {# t4 M# y1 x: o8 `$ `
;; and initialize the traffic lights to one setting
4 h* T9 f% }: q9 P; |to setup-patches: E9 W- {$ @) s' L; o6 @7 F; D' J
;; initialize the patch-owned variables and color the patches to a base-color" n) G, u+ S4 E3 F
ask patches
, T% y+ h- G0 B" g& b+ | e [
- c* Y8 U9 f/ x2 V1 q3 e* P set intersection? false& \! q$ A% j3 \% P) Y
set auto? false, U) t8 f, F/ I- `7 p/ r
set green-light-up? true! c* w3 b# L/ g8 H) f
set my-row -1. s9 M' A+ v6 e9 V% E w
set my-column -1
# P% M* W: a4 n1 N- y2 B$ f8 u; u set my-phase -1
- c. ?. I, O- w2 Q: z. ?) _ set pcolor brown + 3
+ t! y6 e9 `- Y% G6 @, p/ C ]
2 q5 g; ^7 J; U' `3 Z2 M1 f0 U$ P
+ P2 I$ B5 C* \( m6 M ;; initialize the global variables that hold patch agentsets
0 |/ w- Q8 x- W) @; @/ ]' n set roads patches with
5 r& n; Z. V# u [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
4 q! z1 i* T3 R, W (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 Q6 `2 s; s/ Y set intersections roads with8 ]. s. l+ e U
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and- w5 A, O) A2 J8 W/ @1 T
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* f Q) M' A$ v% y
* n' _) B E+ [ ask roads [ set pcolor white ]$ _* {7 H& x5 n( J* T% e
setup-intersections4 x# |' w+ [: k% i9 F
end
4 ?+ y! g3 E9 x0 ^其中定义道路的句子,如下所示,是什么意思啊?
' ^4 f" y5 h" h" i8 G* D: M% N set roads patches with
& @7 j2 V+ ?( _. p8 Y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 l2 R1 W R9 N
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]& Q& Y4 m1 p0 q" y
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? |
|