|
|
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。4 {- B; N, S$ r2 d
netlogo自带的social science--traffic grid这一例子当中, A7 ]+ f/ k8 \+ r6 r6 F& x+ I
globals# `. q# r. ^* D7 L
[. |+ @6 C( s8 @" D$ y2 r
grid-x-inc ;; the amount of patches in between two roads in the x direction
; I, D: ^: c Q1 F: S+ x# {5 D8 a grid-y-inc ;; the amount of patches in between two roads in the y direction6 ~8 A* t+ }- e+ B0 G
acceleration ;; the constant that controls how much a car speeds up or slows down by if# \$ {1 U7 d5 s# Q, r
;; it is to accelerate or decelerate
( c" A. w0 Q$ {. N phase ;; keeps track of the phase! m- X+ u9 S! \4 B/ Z- M8 { [4 f
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
3 r3 }: K' B) X* S% g# e9 G current-light ;; the currently selected light( s4 A- z# l* L& I% s
# X8 e% O; _, H
;; patch agentsets6 n$ ]. Q4 c( `; i" Q# V
intersections ;; agentset containing the patches that are intersections
# v9 l" q. U! i. s; K& _2 i3 f roads ;; agentset containing the patches that are roads! l* H& B( ~7 `9 K
]% H: A& D# ~0 L1 p2 ^' i3 x+ k
( q! f8 n& h* _3 [3 cturtles-own! ]8 I$ g& D {- g5 {, o# p
[
: {7 Z6 M. y$ y speed ;; the speed of the turtle! n/ C: U F& r+ |+ A
up-car? ;; true if the turtle moves downwards and false if it moves to the right! k& }6 Z% ~# S2 I% \- {5 e0 C* ]% h
wait-time ;; the amount of time since the last time a turtle has moved
+ l/ {7 X% d. M" f] D/ @6 L, M8 X: W* l. u; c9 ]
+ g) G8 R& S% X5 f( w: H/ L1 _* Zpatches-own
3 i* F ~$ o4 u+ p[
3 Q! C1 P) p' A% _8 ^6 V4 f; p intersection? ;; true if the patch is at the intersection of two roads% g) N1 e" e! r3 ?
green-light-up? ;; true if the green light is above the intersection. otherwise, false.: p. |7 X) G- c0 b- \
;; false for a non-intersection patches.* C4 B7 Q! s2 v4 w6 v3 z' h
my-row ;; the row of the intersection counting from the upper left corner of the' S. b4 k$ Z! ^# f2 ?0 k/ M
;; world. -1 for non-intersection patches.
' [5 R' c, o: p& n" i8 i3 ` my-column ;; the column of the intersection counting from the upper left corner of the5 P( I8 J& Q% J m
;; world. -1 for non-intersection patches.
6 F$ b% ~/ `9 b( s; h% M! M) }$ W( T my-phase ;; the phase for the intersection. -1 for non-intersection patches.: J& S4 A k+ F- x8 M+ t
auto? ;; whether or not this intersection will switch automatically.3 k# \6 X, k% H6 L
;; false for non-intersection patches.
2 P6 [9 \" t+ [* T0 {& m4 t" [; B]% B* x. [3 s. L( F7 z) X& G9 V
, Z9 y7 m0 r: j- j
}" r+ b; q, A5 X
;;;;;;;;;;;;;;;;;;;;;;
" o$ D: Y0 f5 v6 j;; Setup Procedures ;;2 Q/ i/ L0 x, b7 u; _ G$ n% E
;;;;;;;;;;;;;;;;;;;;;;7 z# h; c3 N4 U/ d9 [* N3 g4 g
& e7 e( H4 V8 D f
;; Initialize the display by giving the global and patch variables initial values.
0 T; P6 ~' g4 w) \/ Q8 E: B0 B;; Create num-cars of turtles if there are enough road patches for one turtle to
( F0 U3 }% v% G- b;; be created per road patch. Set up the plots.4 u4 E+ M7 S* w. m. L& n1 n
to setup
6 W; d" T& W- I) X9 O ca
) M6 Q& ~- [ z+ J6 R setup-globals9 ^# x* m' {& @7 ?2 z
6 I) f7 K. H& D" V; d+ Y. s
;; First we ask the patches to draw themselves and set up a few variables
/ {; f, w0 y2 w/ ?3 k3 {: ]. W2 y setup-patches
# S2 `( _. r5 d! J% o+ {1 p" k make-current one-of intersections
2 W$ m r* b# w6 \ label-current4 k. ~+ @; M* C. h
) W- T- C% D. b3 S
set-default-shape turtles "car"2 u( j6 H9 R: b$ ~
5 z" W% D* m+ [) l" v if (num-cars > count roads)
0 X, ~& e$ c: q( s1 N [
2 s! O. Y6 K% Z) {) ^; ? user-message (word "There are too many cars for the amount of "
/ L0 L. ~ d. S2 e. e "road. Either increase the amount of roads "
0 I' T& T! \7 ~3 A% b3 x "by increasing the GRID-SIZE-X or "
+ @2 @6 a7 O% B% Q4 }# u "GRID-SIZE-Y sliders, or decrease the "9 i( Y! G( G* \& d7 d
"number of cars by lowering the NUMBER slider.\n"7 ^- L& Z7 X' R2 {5 n
"The setup has stopped.")
/ M# ^" Y. R4 T" a% W1 Q) i stop/ F, G/ l8 E! }% }
]
4 E1 P! H- w! }5 p( n0 m u2 Z1 F, U' [) x; i- O. x2 H5 T. s
;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
5 r- P( v$ x- S3 K2 U6 e9 @, o crt num-cars7 M/ \. Z! Q, U1 n- v$ h# I. i
[% N J! ]0 c7 F* @
setup-cars+ s y1 v8 l x) k- [* `
set-car-color& F( `6 \& a' f6 Z! N/ c
record-data. ^% F3 o/ Y H7 ^; }
]% ?: E, ^ D% q4 O. l
, n- D! p2 X6 V/ G
;; give the turtles an initial speed; e" i$ |+ {- q5 d$ G: {
ask turtles [ set-car-speed ]
. v& J/ g) A; l7 T+ r: q/ z$ M
reset-ticks, p# g5 ]" D5 T j2 U9 h' {
end
2 z2 R) I) z: q" j4 J
2 O9 f9 M" O' A U) D0 J3 G;; Initialize the global variables to appropriate values
# O% e6 O/ x2 |: ?to setup-globals9 I. I! ^1 \. G0 q
set current-light nobody ;; just for now, since there are no lights yet
. b0 d0 r+ d1 @ set phase 0
0 N( d$ Y" y2 i h1 p3 k8 T. Y set num-cars-stopped 0% P K8 ?3 E" p# {
set grid-x-inc world-width / grid-size-x
# Y! J) H0 g9 o8 ?/ h U set grid-y-inc world-height / grid-size-y
0 V: D$ o/ K6 u
7 N" k8 c4 T$ x* t- D( |0 T ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary* ?' `8 |- ?+ n6 H9 Q. F2 |/ f
set acceleration 0.099& _/ F2 s: m3 _* ^0 }; ~+ V5 J
end' Q. V4 q: J( E6 K O* |: ~: k8 }% u! }
0 s# W ^+ u# o* h9 o
;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
8 V m# }2 }$ k" p3 k4 O8 c. G;; and initialize the traffic lights to one setting
$ _6 G6 E# ]0 F, p3 J6 r b; uto setup-patches4 j4 k( _ g$ X2 V& ^8 _% E0 B
;; initialize the patch-owned variables and color the patches to a base-color# T8 l. A. d8 Y0 R: {
ask patches8 l+ R, L5 `* j3 Q
[
. G: c3 u& ~" V+ ]; [6 v8 f set intersection? false
+ u' W( \- B& L! ^% ~8 R' Q set auto? false% b9 P, F* K4 C3 e O
set green-light-up? true
# _+ g/ ?; C |% C set my-row -1
6 |- @6 y' u& U$ Y set my-column -1; g! e+ a$ B3 {
set my-phase -1% ^, I; @4 M k4 y7 V: M8 N
set pcolor brown + 3
- c" p5 j. T3 Q( S ]
. @. X7 I& |; C% }8 n7 o, M7 z, d7 S/ S4 @" p+ ~* f. K/ \0 r
;; initialize the global variables that hold patch agentsets' j1 I' O- V* i( }8 I2 C3 Y
set roads patches with
. e" C) B0 j+ ?* o4 k( P2 K [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 \4 L$ x v9 x
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 V5 O5 p- q* K1 c" L4 @7 G" _
set intersections roads with$ {4 S! L/ B2 }* Q: E
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
, v- U) M( I9 @& ]" e+ ~& B (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
' B' I! S( W* V/ {5 i$ m T1 m) u O$ ]: O
ask roads [ set pcolor white ]3 w' K: X/ f& b0 E$ C& A- ^) o: N; N
setup-intersections
0 d# b- d5 X$ T3 Jend- S6 }8 |5 D7 _% K4 ?$ @, N4 F5 E
其中定义道路的句子,如下所示,是什么意思啊?5 F9 \, S3 i1 d) z0 s5 f8 a
set roads patches with' C q W z% x. P |/ J- \
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' @2 i; ^+ j* Z; o1 W: P
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) i: v' `) S! y* K# G+ 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? |
|