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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。
: X5 k7 y$ y ^* |! snetlogo自带的social science--traffic grid这一例子当中,2 U# N/ |' x( s; Q
globals1 d5 w' h' T8 Q% m6 d$ T
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grid-x-inc ;; the amount of patches in between two roads in the x direction
+ N m' s2 t* x9 p" q) L2 j6 t grid-y-inc ;; the amount of patches in between two roads in the y direction
1 C: g% v0 V- t, e2 i$ c acceleration ;; the constant that controls how much a car speeds up or slows down by if0 _" j s, }1 d* T/ z m* ^
;; it is to accelerate or decelerate
- ^$ i- \" P) }( v; A phase ;; keeps track of the phase0 `: C) Y2 f+ a. R7 r/ E
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure. M; _9 `3 M7 Q1 ?
current-light ;; the currently selected light
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;; patch agentsets, r8 M6 U1 F2 o/ f& b
intersections ;; agentset containing the patches that are intersections* ]. u# k1 Z8 M6 N
roads ;; agentset containing the patches that are roads
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turtles-own0 ]3 H! ]) h/ X7 B
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speed ;; the speed of the turtle4 Z8 Y- w5 Q3 ?* X. [1 s+ H4 s
up-car? ;; true if the turtle moves downwards and false if it moves to the right4 w% X: M% ^: W# i+ h! G! l a
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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) s/ Z! d% p8 R+ N1 ?# G! W5 P2 x intersection? ;; true if the patch is at the intersection of two roads
5 t( z1 L0 [2 \6 ~8 _, K green-light-up? ;; true if the green light is above the intersection. otherwise, false., `) P3 C5 J$ }: H9 @. h
;; false for a non-intersection patches.
# w- n2 q; s% [) O my-row ;; the row of the intersection counting from the upper left corner of the" Z' p9 Q$ R/ ^! B/ n3 f, G* y
;; world. -1 for non-intersection patches.& D" \; }) P. P- ^+ _5 s( G7 H
my-column ;; the column of the intersection counting from the upper left corner of the
, y" F5 @/ I/ z7 b ;; world. -1 for non-intersection patches.7 Y- I( f+ d6 I6 P4 r* W
my-phase ;; the phase for the intersection. -1 for non-intersection patches.( Y& J" v9 v) L2 B: v, H6 X
auto? ;; whether or not this intersection will switch automatically.; K+ K0 n# O' w* |4 m5 ?4 S, n* O
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
3 K0 ]% _ Q! h) U5 c9 i* U;; Setup Procedures ;;
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( k3 A$ p4 b' Y;; Initialize the display by giving the global and patch variables initial values.7 y# l' [% C* i' u3 x' t6 \4 F
;; Create num-cars of turtles if there are enough road patches for one turtle to
5 c& p* g; K2 @) H# U( B' A;; be created per road patch. Set up the plots.3 {! {/ T& a" W7 J
to setup
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, v+ M5 Y n- P, J2 B6 c setup-globals: v3 w/ {# E& H5 }2 W
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;; First we ask the patches to draw themselves and set up a few variables( H0 t3 ~3 Y& c Y# `3 |1 {
setup-patches
$ K" O7 N0 L+ t% I! [3 A7 t4 L make-current one-of intersections4 ]/ n; c" A& `& \0 Q: E: d- A7 ^" D1 @
label-current
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set-default-shape turtles "car". K, n) F# O4 I% P1 d; K, }" ~; Q
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if (num-cars > count roads); o, k- Y! M8 ^# a! }8 _
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user-message (word "There are too many cars for the amount of "
# E4 o, ^. ]' F3 W. c: G# p "road. Either increase the amount of roads "
6 Z/ G$ ` W+ A* C3 T "by increasing the GRID-SIZE-X or "
+ F8 G* X7 n [5 M* c/ K; M "GRID-SIZE-Y sliders, or decrease the ": h0 j- ?( a a0 c$ E
"number of cars by lowering the NUMBER slider.\n"2 U0 ~4 i2 _+ Y* p6 X& ^# k! A
"The setup has stopped.")
% r! U) ]" X8 |# F stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
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[
6 } R) B# b* G( W setup-cars
$ o4 R! y# x" w$ u, P% ] set-car-color3 k4 s/ m, K$ I; [# r9 A
record-data
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;; give the turtles an initial speed. @' ^' Z& a, ]" V4 Y2 l
ask turtles [ set-car-speed ]
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reset-ticks+ q( M+ {" u2 F( ` n3 ?" ~9 }1 G
end9 Y7 Y5 [* [/ k$ N* U8 A
) @% b3 s' L* m;; Initialize the global variables to appropriate values, `7 Y. A- \" m% ~2 `" u
to setup-globals
# ]) y4 b; Y5 `$ h6 [5 }) m set current-light nobody ;; just for now, since there are no lights yet
# l% I0 k$ n1 Y: q5 c$ t set phase 0" W. f" X# z0 k" ?. |$ R/ n, `$ t
set num-cars-stopped 0
4 a0 j2 C* G( a1 N set grid-x-inc world-width / grid-size-x2 T) Z! t: d! J% k8 [
set grid-y-inc world-height / grid-size-y
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6 ^ ]1 H* g5 V& `+ \1 [ ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary' i6 W+ h0 R) M) {& D
set acceleration 0.099% w+ e9 j% x: V* b
end9 p/ {5 ]8 S9 F" f+ z
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
6 {0 B! l) j" g' j5 v" l;; and initialize the traffic lights to one setting$ U) c& K( |5 H3 P% \ M0 r3 G9 f
to setup-patches
8 y! `4 C/ h3 F ;; initialize the patch-owned variables and color the patches to a base-color1 d0 u! T8 k. @9 d; a- S; ^$ `
ask patches' C- F/ {' n7 U8 O; n& O
[
% ]( O/ C! A) `$ E; M* Y; r+ s# I set intersection? false
5 k2 E+ j+ l. s% l- g set auto? false
: J$ T( C5 o7 }( J% P+ L' A set green-light-up? true/ _4 m' o7 ?, T# ~
set my-row -1) K# o( T: z9 L$ I
set my-column -1( v; N- C6 C, e+ P/ \
set my-phase -1
, k3 U2 ]- I# a+ z' C+ F+ ~, S set pcolor brown + 3" Q: z5 h4 w: W: Y Q6 ]& n- F
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8 l) b- C4 N# d7 ?& m% N ;; initialize the global variables that hold patch agentsets
& e) j" m: B8 k! V set roads patches with
" u$ a) y- p M( t( Q- @# p [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 z9 j$ p* I/ m- a. n6 u, R4 h* o
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
6 s: B- @6 k0 i p. o V) E) ? set intersections roads with+ O& m8 C7 |. _# h. s
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and& U; G- P; J( [2 p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]0 n- Z- Z% k( |9 v: J7 f$ I
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?
. v# v) V5 U6 a/ b9 c) R set roads patches with: q- t$ y0 ]* y- x
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or7 _' Z- g! i1 b) Z" L+ @2 }6 F
(floor((pycor + max-pycor) mod grid-y-inc) = 0)], X: Z' P+ ^. O6 ?. b( l v2 U
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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