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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。
- |! k$ @' v2 tnetlogo自带的social science--traffic grid这一例子当中,' [' V* C: m6 j6 U0 Y+ c
globals
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) J$ v. C; s- K8 O4 h, h grid-x-inc ;; the amount of patches in between two roads in the x direction
/ s8 {% A1 ^4 C grid-y-inc ;; the amount of patches in between two roads in the y direction1 D4 `% l* w7 N9 A/ `
acceleration ;; the constant that controls how much a car speeds up or slows down by if
4 `, e6 V9 S& I+ |9 B" d7 f3 J8 d ;; it is to accelerate or decelerate
7 B! l% O& |7 p phase ;; keeps track of the phase/ n; \" \( z8 s
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
' c! z A8 c: c7 U/ ?+ U7 ^ current-light ;; the currently selected light
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;; patch agentsets/ H; \2 Q7 H% H g( _* n
intersections ;; agentset containing the patches that are intersections
( o, Q* A- N9 o0 r4 x+ P roads ;; agentset containing the patches that are roads0 U/ X5 x/ C( D' T- @" I3 M
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( O" f& h9 m4 A& Qturtles-own
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speed ;; the speed of the turtle
8 o$ J4 B2 F ] up-car? ;; true if the turtle moves downwards and false if it moves to the right% Z( D1 B5 E) {3 `8 H6 ~' h" f
wait-time ;; the amount of time since the last time a turtle has moved
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# {, m! w: Y( ^patches-own; i/ }* z, \% |" u1 K& T. \ p
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intersection? ;; true if the patch is at the intersection of two roads( K! o {+ d7 p4 F, _6 q( F5 |( D
green-light-up? ;; true if the green light is above the intersection. otherwise, false. r4 C) N% ^5 c h" z$ X
;; false for a non-intersection patches.+ D; w. ?' y! f1 Y+ _
my-row ;; the row of the intersection counting from the upper left corner of the
: C, H2 A' o% e ;; world. -1 for non-intersection patches.; E) K# c8 v# K" n- U3 d* r7 H9 N6 {+ j+ W" [
my-column ;; the column of the intersection counting from the upper left corner of the/ G& _7 W5 r! q) x9 Z3 ~. A) a
;; world. -1 for non-intersection patches.' U+ D' L: r* Y/ X" \2 F
my-phase ;; the phase for the intersection. -1 for non-intersection patches.3 z) H0 R* R' I4 f; H
auto? ;; whether or not this intersection will switch automatically.
& c4 j' ?& @2 E' h ;; false for non-intersection patches.! V1 m ~& Y, M2 K
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;;;;;;;;;;;;;;;;;;;;;;( p! \1 j. v q9 j3 Z
;; Setup Procedures ;;: P4 S$ @5 d$ e6 L' O
;;;;;;;;;;;;;;;;;;;;;;
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1 I. f. a. }( T* |( n( A" F; m( [;; Initialize the display by giving the global and patch variables initial values.8 W+ V: t! l3 E; p" R/ [3 i- _6 [* Y+ Z
;; Create num-cars of turtles if there are enough road patches for one turtle to
1 P& s7 x( c* k( x) X;; be created per road patch. Set up the plots./ H0 f% I% ^& ?6 K' U! C
to setup1 f r' y U1 y5 Q! t
ca
! I2 I, @4 f( z% ]0 s4 @5 | setup-globals1 m+ s1 T0 u+ F4 r. t6 I: g9 a* O
' K1 I7 ^+ R8 b, Q9 a3 r( j ;; First we ask the patches to draw themselves and set up a few variables5 j# r d. c; `3 o4 S
setup-patches5 `/ ^& T4 J1 P+ ]; q5 y
make-current one-of intersections- ?7 L- E2 i( C' c6 ~7 w
label-current5 @! H. A$ y% J% h9 g% I0 |5 Q4 [
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set-default-shape turtles "car"
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r! C& r5 D2 I% z Y if (num-cars > count roads)
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# c% T4 q/ ~6 Q% F/ s* `+ t user-message (word "There are too many cars for the amount of "
# R! G. K) t3 u5 R P8 \ G "road. Either increase the amount of roads "
7 L4 n0 G+ [1 x "by increasing the GRID-SIZE-X or "
, i9 |+ T+ ~0 B% n "GRID-SIZE-Y sliders, or decrease the "/ C& d% q; _7 ^8 F+ C
"number of cars by lowering the NUMBER slider.\n"6 z1 R J7 K, |2 K1 ]
"The setup has stopped.")0 E- U5 q3 }8 ~
stop/ g: I" R: O. s' p$ l" L7 t3 d
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. p1 A$ g, r3 G ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color: N8 Z# x- a7 ^# g% X
crt num-cars [2 \6 l, r7 H/ V5 B' z3 _. i9 u
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* n9 s+ q6 J! F" [/ u" ?$ ^8 X" ` setup-cars( r+ d+ _' @9 [& W9 S- B
set-car-color% L, h R& m$ z
record-data
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;; give the turtles an initial speed
: G! Y" g* R; g, u ask turtles [ set-car-speed ]' W$ Z+ b4 b9 P
! c+ ~6 Z! O9 T& e* u# h5 z( X6 g reset-ticks
# H0 G0 y, n/ i- ], |0 R" nend
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;; Initialize the global variables to appropriate values
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1 n% {) t3 E9 M0 ~2 ?7 Z( u$ W" \ set current-light nobody ;; just for now, since there are no lights yet
/ g& s7 e6 T/ d3 s( Z set phase 0
$ _8 I8 I8 E% j) @* n set num-cars-stopped 0
1 S+ C0 X: T. D) X9 a2 ? set grid-x-inc world-width / grid-size-x
! y1 h6 F8 t O set grid-y-inc world-height / grid-size-y8 v2 v# E4 }, F2 G
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary& ^) [. O3 R1 M i# l
set acceleration 0.099
. Q, t! z* _/ z1 M9 Qend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
8 Y' i! D- z8 z% \* k;; and initialize the traffic lights to one setting. D8 F8 \7 ^& r9 ?0 ?; p
to setup-patches& p/ ?$ |6 J m% n
;; initialize the patch-owned variables and color the patches to a base-color
2 M( ]2 W' W4 [; F ask patches! W* P4 A- c, a" Q+ d
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3 Y& H# L2 Q% ~ set intersection? false4 O) G% ~) y; r/ ^5 @
set auto? false- y% d# B" j2 c$ X" u2 u
set green-light-up? true- L M) ~/ P; u& a: S& B7 c
set my-row -1
* V7 e5 P% w8 ?" S; G- O5 z/ M o+ z. U set my-column -1
, h( [2 @) d& b2 l3 j6 a set my-phase -1
/ c1 S* _& Y- d3 O& t# `: H set pcolor brown + 3* `) Q" a. Q9 Z$ @& P
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;; initialize the global variables that hold patch agentsets. Q8 D2 f- M' X
set roads patches with
7 a0 b! P, S$ n" l* M [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: @) L4 {) k: R( h! Y+ S
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 C8 `) Q2 \; D+ a, ?; |+ X8 n
set intersections roads with! F* O2 i' F- h3 i9 U
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and) c1 Z( e. x1 p* [
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]- X2 ^; j$ M% S1 ~2 X3 V* X8 ]
+ i# n6 w! v3 K4 y6 p ask roads [ set pcolor white ]
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6 k9 b- q' T2 q4 eend
- _- U& c6 R* L$ P其中定义道路的句子,如下所示,是什么意思啊?
8 A2 d2 X% [+ i0 c- i5 f" f2 j9 T set roads patches with
+ i% K ]0 W9 \# ? [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or I4 L: X2 d( j" X
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
2 T" N1 p( F2 C8 h! R) j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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