|
|
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。
$ V2 [# g* E' @1 J) g) I, pnetlogo自带的social science--traffic grid这一例子当中,
- U+ w2 Y) x" F7 a' zglobals" {6 D# X6 A1 N. Y# D
[
' J# _. S( i* a grid-x-inc ;; the amount of patches in between two roads in the x direction: P( d7 R' [. U# r; F" u
grid-y-inc ;; the amount of patches in between two roads in the y direction2 s' s8 d0 a* Z5 F5 t
acceleration ;; the constant that controls how much a car speeds up or slows down by if/ J* G' W3 C- d- X& p
;; it is to accelerate or decelerate7 }$ a( i% H2 Z2 i, ?5 r% P
phase ;; keeps track of the phase
4 ?3 @4 D R- e6 S% i num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
9 B- I. ?6 a/ Y% L! ]7 l current-light ;; the currently selected light
; Z3 y1 ~" y2 g i, j" H @; }* |9 C+ f. l! i, E
;; patch agentsets: C/ Z! S4 c3 M/ G: k% u
intersections ;; agentset containing the patches that are intersections: ~& \) Q2 ^) K1 v% B& d
roads ;; agentset containing the patches that are roads
( }0 r0 z9 q; E4 t) h]
5 Z9 p( G1 a$ n5 w) N" ]- }- y! w0 |+ D9 _' b8 x }
turtles-own0 ]- Y; D' k+ V: B, U
[( q8 J( L) n2 G5 x! F0 ]0 }
speed ;; the speed of the turtle5 [0 O3 N4 m1 H' N3 |8 K
up-car? ;; true if the turtle moves downwards and false if it moves to the right3 E; _. W- S* R: i3 N7 ?
wait-time ;; the amount of time since the last time a turtle has moved3 y4 p( U2 w" m K7 R% y. A
]$ l% K% S6 r; q. @/ h2 N
- ]9 y& N V. U% l9 D4 B
patches-own
2 h- q$ i5 A% d3 k7 {[8 ]& q" X! E3 U7 S/ V
intersection? ;; true if the patch is at the intersection of two roads( n# n( k4 ^; q/ \
green-light-up? ;; true if the green light is above the intersection. otherwise, false.# M3 g. z3 L. B" h2 J' A# F
;; false for a non-intersection patches.
% N: M# S3 I% P! {5 h" i: x my-row ;; the row of the intersection counting from the upper left corner of the9 i3 \8 @& j6 J' e" e
;; world. -1 for non-intersection patches.7 U" d3 S( A5 [; `3 L
my-column ;; the column of the intersection counting from the upper left corner of the5 S# S, y3 ]' e3 K8 |) F
;; world. -1 for non-intersection patches.3 l& y0 ` Q/ N. y9 J+ i
my-phase ;; the phase for the intersection. -1 for non-intersection patches.* ^1 p: z* L. w* x/ E' ?7 l. N5 j/ o
auto? ;; whether or not this intersection will switch automatically.4 E- y6 x2 }( t1 n
;; false for non-intersection patches.
0 _& Z& T; C; @$ A- v]
5 N; I+ ~: _' |+ g! V/ Q A2 i2 K$ u# w" V# R5 }7 Q
9 T: F" J6 I3 u; G- u6 S2 v;;;;;;;;;;;;;;;;;;;;;;
& e+ `0 z ~ l( o# D; m% k+ i;; Setup Procedures ;;
' [. i; r$ f A" S" k;;;;;;;;;;;;;;;;;;;;;;0 Y* m3 `% j. {! u
, L6 Y5 r6 ^) ]8 g8 `4 W
;; Initialize the display by giving the global and patch variables initial values.
B3 Y( k6 [! u- i) [' X v;; Create num-cars of turtles if there are enough road patches for one turtle to- C+ Y. A2 U: V. j
;; be created per road patch. Set up the plots.0 @3 s% O$ x; z3 ?" L
to setup9 I) }; B2 j5 I6 T7 j( \; W* v9 j
ca
7 |! z1 w2 y, f+ l# u setup-globals- W: V1 d+ D+ Q; {( C$ D" N
& f" q5 H. e/ l2 C9 \* s/ r" \5 o ;; First we ask the patches to draw themselves and set up a few variables# Q9 W# g- K9 e7 Z: f( \( i: y: p/ H
setup-patches
0 {0 k3 U( I& b make-current one-of intersections
" j4 M3 v# M! `7 o label-current" L) {- f& o3 g/ [
" Y4 x3 i$ T2 m! V$ J set-default-shape turtles "car"* x7 O7 j" H. S: b
# P, L8 Z) M; e; A# [
if (num-cars > count roads)# p) t" ~0 b9 x3 i/ [7 Z0 k
[
4 ^6 F! D1 O" w4 `) h8 B user-message (word "There are too many cars for the amount of "8 P4 X w+ c% w( B X0 U" E
"road. Either increase the amount of roads "- t0 u$ [ b& w: U+ r( \5 A
"by increasing the GRID-SIZE-X or "
0 S: O5 A3 Y/ M7 W! O7 n' h "GRID-SIZE-Y sliders, or decrease the "
- B2 V% x% u7 c# n9 I5 k, v "number of cars by lowering the NUMBER slider.\n"
9 h5 y- [7 E) |' v "The setup has stopped.")6 ~% M% Y7 @! C$ s+ W3 u
stop+ I- H/ N/ w1 X$ c1 a
]$ J/ v7 A/ b3 j+ f0 ]# i' \$ @, n
& ^7 x/ J" z& _+ ~: Y) c ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color; w' \7 x0 f) O! g1 r8 P
crt num-cars- a& V9 V" ^8 W1 g
[8 [' ]$ _" B. h* Y; m" \
setup-cars
* C4 h) I$ t3 B. g' c5 s set-car-color
8 R/ l9 {) \$ f! i record-data- j& w- T) c/ K6 o
]! U4 W6 @/ u# |
% C; A9 j/ c1 k* ?8 i4 e ;; give the turtles an initial speed Q$ [$ `- y* M5 J
ask turtles [ set-car-speed ]
; j* E4 ~- `' J, [" o- u% r
' Z& g! s. n$ r0 X$ z, i reset-ticks& v; W' T" s5 ?1 n- r
end( E6 t. |. B3 q% f( W* n3 i! }$ t
. Z; m- g! p) R) X3 U0 b& a;; Initialize the global variables to appropriate values, N% K# v6 b$ t6 N K8 o6 y+ m
to setup-globals( T$ A C% l. D# E( s5 M
set current-light nobody ;; just for now, since there are no lights yet
, p0 X5 F& Q9 G# [9 ^- ` set phase 0, d) y1 L5 \, F9 d. h: f
set num-cars-stopped 0
9 M6 o. g/ i8 M set grid-x-inc world-width / grid-size-x& E5 y7 j6 x6 Y2 ?1 D
set grid-y-inc world-height / grid-size-y
: M( V" i4 I8 H- U8 h/ ~
# g2 n2 C% ~6 v, p5 g ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
; Z/ N8 n' @9 {( k9 e& G$ | set acceleration 0.099
9 r. Y+ B k! N% u! ^end- R3 f5 a$ ~' F
$ @! J) M. Y( {
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,, _, K/ C" F' ~& V2 N
;; and initialize the traffic lights to one setting
3 X4 R, R: f& Zto setup-patches
# c1 P+ ]0 d w& Z ;; initialize the patch-owned variables and color the patches to a base-color. _4 f# l/ v/ R, i0 Z
ask patches" T7 S( [ ^, H3 x
[
1 H$ h. t f" p) W; z% Q& X* E set intersection? false/ Z- @. J; l! `6 n1 p. b7 w8 z
set auto? false
* Q+ k; s6 u, q- z set green-light-up? true4 A! j% | Y P+ p. X$ S7 j
set my-row -1
0 r$ M+ I# W" p X F set my-column -1/ u$ T/ @. n; I! @+ r* I3 N
set my-phase -1
1 n" g4 E8 A& w6 a% h set pcolor brown + 3/ s/ Y' P' g5 X& d& E3 W5 n8 I
]2 D/ {5 Q8 j" U
9 s9 U9 w7 I8 L; W
;; initialize the global variables that hold patch agentsets
3 _ U2 O; J& E; L m; I set roads patches with
9 K5 E( G$ c+ x# \ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 t/ @ `8 f3 J, m (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- I8 P- z, a" Y. ]
set intersections roads with
, ^& Z2 m$ h# d7 D+ [ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and3 N1 a6 u6 V9 M e5 [+ ^
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
3 X% c6 c4 z0 t# u: L# A9 t
0 m; o4 _# [6 \. {1 j# j/ @ ask roads [ set pcolor white ]
& t' L6 `/ F9 e0 N4 q setup-intersections
- }2 @' u5 K$ [: z* S$ Bend
* e* k0 _) o1 x. a其中定义道路的句子,如下所示,是什么意思啊?2 V7 |- P% H+ A- Q* i X
set roads patches with. o9 i9 J3 N* V) y
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. g3 X9 C4 z( ~+ p' P: x (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; c8 d; x; ~" V$ z7 s% a
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? |
|