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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 X" y. M" Z" h; |( Anetlogo自带的social science--traffic grid这一例子当中,
) j% s# t0 |; ]- }5 G$ C$ A% Y# f- N+ Dglobals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
& s0 f% j* U) i: n: T N grid-y-inc ;; the amount of patches in between two roads in the y direction- p; s! V' `( I
acceleration ;; the constant that controls how much a car speeds up or slows down by if+ ~) I4 ]* ^& d
;; it is to accelerate or decelerate. g' X, Z: X, `4 U% d: Q3 v
phase ;; keeps track of the phase
% H& l1 b/ e3 t9 i" P num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
3 |7 Q# u y4 G/ N current-light ;; the currently selected light, ~2 j. V6 Z g2 i# A
0 D1 O1 I2 ^' b) V9 \+ i- e/ V4 x ;; patch agentsets' g- ?4 C {6 k# Y
intersections ;; agentset containing the patches that are intersections% O' a5 |' E+ B) ^
roads ;; agentset containing the patches that are roads
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* z' l+ q, x( W8 P- m5 _turtles-own$ B8 z; O" `3 S: G8 d
[
+ f; M! z. h6 V2 Y/ l9 A speed ;; the speed of the turtle
' g* [1 R& ~) p+ q up-car? ;; true if the turtle moves downwards and false if it moves to the right
' A# k6 p0 Y# `, e# O wait-time ;; the amount of time since the last time a turtle has moved* X' }/ z$ R" L; n/ V& p1 x- q) X
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patches-own6 W5 } W0 c- h. G
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intersection? ;; true if the patch is at the intersection of two roads
7 k/ p' ?% O" {6 K5 Q* d green-light-up? ;; true if the green light is above the intersection. otherwise, false.
) d# ~5 g) V& V/ G) G ;; false for a non-intersection patches.
- k" d$ m4 G2 D( _2 n+ @ my-row ;; the row of the intersection counting from the upper left corner of the
# P; L! W2 y& J8 k4 _$ F ;; world. -1 for non-intersection patches.. }8 }3 d! W$ M1 G5 O
my-column ;; the column of the intersection counting from the upper left corner of the
, S* u8 x' G H4 C% W2 ]. E" E ;; world. -1 for non-intersection patches.
2 V& @6 x' t2 x U Y9 z my-phase ;; the phase for the intersection. -1 for non-intersection patches.
( Z0 a' R+ }9 U+ `/ ]" [% a auto? ;; whether or not this intersection will switch automatically.
/ d5 Z. y; h5 `6 s0 K& q& d0 a ;; false for non-intersection patches.- Z. z8 F Y4 D
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;;;;;;;;;;;;;;;;;;;;;;5 R( y. a4 F9 {) D6 G: s
;; Setup Procedures ;;' R- C+ O2 p: R0 F% G* X4 w6 |
;;;;;;;;;;;;;;;;;;;;;;7 S: j- {# J1 i& a& K
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;; Initialize the display by giving the global and patch variables initial values.
) f; x# I. b; W8 o;; Create num-cars of turtles if there are enough road patches for one turtle to
, z {- S% X' J;; be created per road patch. Set up the plots., ]6 s2 f% w, m5 x4 D( L; J6 |
to setup
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% c5 H# U* Y* T setup-globals3 x4 f9 }6 B% ]* i; j4 F1 Z
8 J! k" e/ \1 j/ i( @% x* c ;; First we ask the patches to draw themselves and set up a few variables, B8 u4 b2 U- J% k- ~! o, i1 A
setup-patches8 I# W2 U% I& W1 j4 k7 d! `; G
make-current one-of intersections8 \- S5 ^( r2 D e, K
label-current
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% P( H. G- {" O set-default-shape turtles "car"
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3 J6 _/ M2 ? G4 m4 y if (num-cars > count roads)3 O1 E$ V7 F% A# P1 t1 D
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user-message (word "There are too many cars for the amount of "
/ V1 r# Y/ M# H5 ?4 j "road. Either increase the amount of roads "
! o# q' u# n6 P$ ~- q% { "by increasing the GRID-SIZE-X or "% H% n8 F' G3 C1 W( f+ y' q ?% S+ S
"GRID-SIZE-Y sliders, or decrease the "
* u% c8 s) L/ z7 P. H- K "number of cars by lowering the NUMBER slider.\n"
7 v5 M) U, {% p8 z "The setup has stopped.")" ~. J, y Q' v; N; I7 n8 ]5 A
stop7 D% \! r- X& ~3 `4 ?. l
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
0 Y! ~) {* X4 g4 E- ^, f1 L crt num-cars
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setup-cars- x L, r( T# U$ N P4 ~) s
set-car-color+ P) u5 U# }$ p" d7 L i! o1 r
record-data0 [' F& I; x/ f
]
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;; give the turtles an initial speed
# r0 H- f) B9 R0 g" H" R ask turtles [ set-car-speed ]: j: t0 E2 U/ r% T t; s1 ~# x
+ T n* k: T) l @* M reset-ticks
# b8 `2 _3 Z; k# X3 J6 \; qend- L, [( k: I f3 Z6 }( ?5 Y
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;; Initialize the global variables to appropriate values9 u2 }3 s: F$ B9 O1 g' b+ S
to setup-globals" a. k2 `$ f9 }1 S! [( u
set current-light nobody ;; just for now, since there are no lights yet' T3 b2 I0 e9 F2 \) j. I
set phase 0
m: r$ X. s1 w; N0 V5 v, ]5 l set num-cars-stopped 0
5 ^2 z( s* K9 [& p* \$ ? set grid-x-inc world-width / grid-size-x0 t, m: x) x5 O6 u1 w' w. e F% k* N
set grid-y-inc world-height / grid-size-y1 P5 L& p3 S/ C. _) m. m9 m
; e( l8 l+ D. K) Y# Q3 g& }- x& e ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary9 r) s1 x7 L- a9 r. c0 h
set acceleration 0.099
3 A! {* E% }, k: x0 [end4 r$ U# Q1 E" }
$ L* O/ E' F9 \0 W% d0 ], v;; Make the patches have appropriate colors, set up the roads and intersections agentsets,; P* u9 R& c% L& ?+ Q) L
;; and initialize the traffic lights to one setting$ @' M" W8 P5 g( s
to setup-patches
9 `& B7 m1 y4 D, i' t ;; initialize the patch-owned variables and color the patches to a base-color
, A$ I4 h, y; G2 l5 X# x. q% f ask patches3 t: k: S8 L# Q' x- h
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set intersection? false
$ [& i% n/ n: \4 H' s" {+ k) x' {" R set auto? false [7 c; x/ Q; @& S' j# f6 L2 N
set green-light-up? true `( z# t9 s! L1 b, ], d$ O' V
set my-row -1
* Z- N- x( `, c6 ^1 ~ set my-column -1$ }" }6 c0 S" d+ H4 _ A4 ?* [ [
set my-phase -1/ R. b* l- D' Y9 f8 W
set pcolor brown + 30 R3 F- d( n) k) @% {) J
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$ Y( B7 y9 @: `2 M2 z% [ ;; initialize the global variables that hold patch agentsets
, Z) H- B& ?* O set roads patches with$ f" I% r% D4 u
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ R- _0 V+ i- |/ \
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
7 w& R9 _5 c2 k set intersections roads with4 s. o) r0 ?9 R6 x* ^& l
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and5 }& L+ [! [8 ?( t, k9 |1 Y
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]% S4 w8 {1 }, `* ~7 H2 h$ C
- T0 ]' A- p4 J2 G ask roads [ set pcolor white ]
! H5 h; n/ k3 s1 R' }# W, g" Q/ N setup-intersections
v: t6 x$ b* S- j- W" Jend
& y) s1 ` f$ r }其中定义道路的句子,如下所示,是什么意思啊?. e+ N& Y! K$ A- |" y% k
set roads patches with
2 `0 o5 ~# Q- T2 \* s. \ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
1 B% G0 r: W6 I& ~, t2 a( } (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; \( ?1 A# L, ]. h/ _7 x9 Q
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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