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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。
5 T; y8 {$ q7 jnetlogo自带的social science--traffic grid这一例子当中,
5 @2 @6 P2 H" Y4 kglobals& C3 i8 d% O# M6 J+ f% m2 E
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7 w E6 h% @) v: Y8 c' l# J# J2 @ grid-x-inc ;; the amount of patches in between two roads in the x direction% k' J$ H4 I4 ^7 D
grid-y-inc ;; the amount of patches in between two roads in the y direction
4 W) T1 [6 f: L/ r+ k+ o acceleration ;; the constant that controls how much a car speeds up or slows down by if; `% g* n6 v" p2 e3 ^7 w
;; it is to accelerate or decelerate
& q: x8 h" O' {1 P8 y phase ;; keeps track of the phase* }" `1 p/ `6 Q# X U5 {* y
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
6 @" D9 ^1 p% Q) }. F3 | current-light ;; the currently selected light
3 }% o- v) T% q5 W/ q5 f0 R9 I% s/ v" ]
;; patch agentsets2 b/ Z1 R6 x+ |( q
intersections ;; agentset containing the patches that are intersections
1 }6 w% ^3 w) K7 v7 c roads ;; agentset containing the patches that are roads6 K1 ~- z7 A& h. U9 \. M7 U' ~
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turtles-own& B* {& y; y! s c: Q
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speed ;; the speed of the turtle) V+ _4 o! s- P: l( d+ w* n- d
up-car? ;; true if the turtle moves downwards and false if it moves to the right
I# P/ ?2 H6 W+ l- } wait-time ;; the amount of time since the last time a turtle has moved
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2 p) w A* \' ]; Epatches-own
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4 S0 L/ z% W7 | intersection? ;; true if the patch is at the intersection of two roads
* |: t# i$ Q) p, N7 C! b E green-light-up? ;; true if the green light is above the intersection. otherwise, false.' U4 O! j& x6 R V, Y2 ~, c s% h
;; false for a non-intersection patches.- t; l. L8 [% {% m) H) X5 q
my-row ;; the row of the intersection counting from the upper left corner of the
+ a% e2 ^% o+ e/ w7 b2 C ;; world. -1 for non-intersection patches.
& K' X+ l3 ]5 ~- A& I$ y% i my-column ;; the column of the intersection counting from the upper left corner of the
- X4 R* l/ [$ L. V ;; world. -1 for non-intersection patches.
$ T; o+ t4 p( f1 N$ R0 u my-phase ;; the phase for the intersection. -1 for non-intersection patches.
! z) r1 f0 w- {1 G9 r) l auto? ;; whether or not this intersection will switch automatically.
+ H3 D. B. _; l! k4 R ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;8 S% o+ Q3 q: s8 Y5 T. D+ b0 U
;; Setup Procedures ;;
5 _7 }; [( U* j6 ^% c;;;;;;;;;;;;;;;;;;;;;;: `! N! Z" r8 ?8 M+ a' n
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;; Initialize the display by giving the global and patch variables initial values.9 T$ l9 Y3 h" Q m8 z+ Q7 p; K
;; Create num-cars of turtles if there are enough road patches for one turtle to! K5 A( S5 i/ z" ?0 U( Z. T6 w2 x
;; be created per road patch. Set up the plots.' D b9 p0 Y6 |5 c) B& J+ B
to setup
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3 t3 E! R4 {' P( A setup-globals
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" @* ^. q# `+ o( Z- E* K: U& {- q2 T ;; First we ask the patches to draw themselves and set up a few variables
, d6 {6 L* l& q, D2 `" S setup-patches' U2 n+ C8 _4 c9 j5 G6 y
make-current one-of intersections
& O7 ~3 V1 w' y$ q$ D label-current# l4 t+ O* Q: l" H0 y* E2 e
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set-default-shape turtles "car"
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if (num-cars > count roads)* k7 V; w* s: Y9 t8 A
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user-message (word "There are too many cars for the amount of "$ A7 [; M/ ?) A* }1 k9 `
"road. Either increase the amount of roads "
% o. U0 y" R9 E "by increasing the GRID-SIZE-X or "
5 j2 N+ H% p5 u' @5 i5 }4 | "GRID-SIZE-Y sliders, or decrease the "# y5 m' T) w3 M1 W: Z
"number of cars by lowering the NUMBER slider.\n"
. B0 G; e8 J# o5 M0 E: G "The setup has stopped.")
/ j/ W: K f J# c7 S stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color1 p9 c" L$ W9 T9 {! X; N
crt num-cars$ v, n9 W' \0 ]8 \* Z( `* n
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0 M: B7 p3 S) O$ {; [& T setup-cars
+ s3 z/ q7 Z9 L2 Q8 i set-car-color
3 {) w/ C9 e# n" \& y record-data. |, k& A$ E; R; g \3 {" }
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;; give the turtles an initial speed
" q. g6 y: r, ?$ q ask turtles [ set-car-speed ]
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4 n2 R, z1 x# f2 E reset-ticks. Z8 C; { y" g5 ~- }% ` J
end1 d* j2 [) P/ _
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;; Initialize the global variables to appropriate values
Q" A: a1 b; x/ ]# |8 l) Sto setup-globals
1 j; @ |- o4 x# y2 @8 \' w3 F. Z set current-light nobody ;; just for now, since there are no lights yet+ P& Q3 `2 Q( R/ I1 b4 ?8 I
set phase 0
$ e6 o5 m8 X! m1 Q set num-cars-stopped 0( _0 B& T: x3 D, a
set grid-x-inc world-width / grid-size-x# J$ _# i, y! R% E6 `
set grid-y-inc world-height / grid-size-y6 q' {: E$ K* u, F
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary Y: ]0 b L8 f7 F o4 ^, A
set acceleration 0.099
+ g! r7 }/ L, u' w. aend" m2 L) _' V- U4 a1 t
+ P% A. Z2 F2 { _& O8 P;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. }% {' ~+ h3 [; Q;; and initialize the traffic lights to one setting
2 ~8 Q, ?) s+ ^/ V2 u: m) ?5 U$ A, bto setup-patches- Q& S3 ?/ d, O E) u2 T* o
;; initialize the patch-owned variables and color the patches to a base-color7 a9 }- r( j+ C
ask patches
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9 a' S2 F9 A. ]) o3 R+ V4 K set intersection? false# J$ T/ [5 X6 a j
set auto? false b& Y7 ?3 }- L. v. M) J! j
set green-light-up? true1 s% n, X! W Y& B0 p
set my-row -1* |* ~8 N" `8 k; x* o
set my-column -16 _, o5 Y! t# m7 y4 e
set my-phase -1
5 o; G& ] P+ _ set pcolor brown + 3; g6 e" P7 i' w& {$ w8 S
]
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% e/ N9 M2 }. n$ Z" b( x ;; initialize the global variables that hold patch agentsets
, e6 s8 i0 [) o3 S. O4 D set roads patches with% F& H( S) C, `" K
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
' ?( B* D k+ h! a. B) W (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- ?8 v+ p& ^' k set intersections roads with
& y- A. q, ^ p4 W% { [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
- G2 E+ S$ C, q, _# ?& f (floor((pycor + max-pycor) mod grid-y-inc) = 0)]; b9 ^. U5 R- M3 y: m
% G% s" \( s% i2 b/ S ask roads [ set pcolor white ]4 ~: s, M+ s; d2 n% v
setup-intersections; M, s. `( t n/ `
end& S: y$ _8 t' r. x
其中定义道路的句子,如下所示,是什么意思啊?
, d; S6 M, C* P5 R7 b4 P, r! ]& H set roads patches with' i" R: Q7 ~8 C
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 n! n6 c1 |* q( M; F/ J
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]0 O) L1 {& g, f0 |- z0 _
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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