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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。8 m8 o. S: C: m
netlogo自带的social science--traffic grid这一例子当中,
: S9 N% Y' {) K0 s' aglobals
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& x/ C, U! X' p4 N4 b: z+ u1 @+ | grid-x-inc ;; the amount of patches in between two roads in the x direction8 B" ]" D2 t6 |% Z
grid-y-inc ;; the amount of patches in between two roads in the y direction2 m, q8 h% Y2 H1 H& h% ^ r
acceleration ;; the constant that controls how much a car speeds up or slows down by if% N: q, e) ^# ]
;; it is to accelerate or decelerate) r. ^/ A1 N- c) I
phase ;; keeps track of the phase
( r( |/ B5 l' r' o9 v# ?7 g( q1 a num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
9 ]2 l) ~- x# `& J4 h) R, O current-light ;; the currently selected light+ \' Q* J6 i4 k [* R
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;; patch agentsets+ n9 Z, Z6 m; }7 K% Z* s4 X r9 S
intersections ;; agentset containing the patches that are intersections. }# J. J6 x) _* k2 `. v8 Z6 g- u. G
roads ;; agentset containing the patches that are roads2 ]9 i+ o. t5 E' P; L0 p M. h
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7 R) g8 I! k nturtles-own8 @- i. V. F' \7 D# B7 [* L) G
[
" l6 h" Z, K' i9 ~* o! f speed ;; the speed of the turtle
p9 B$ h' z) {1 @ H: _ up-car? ;; true if the turtle moves downwards and false if it moves to the right
+ k. a- H- |2 L; J1 f$ f# \% R wait-time ;; the amount of time since the last time a turtle has moved
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patches-own" M3 i% N7 p+ {+ j0 ~- F1 Z8 }
[
9 b" d+ y/ u+ o6 e intersection? ;; true if the patch is at the intersection of two roads
% C8 l- Y9 \9 H+ T2 e- v$ U green-light-up? ;; true if the green light is above the intersection. otherwise, false. p! g! C& c7 Z7 J( f
;; false for a non-intersection patches.
7 a7 ^* D$ p1 N8 W- y2 q" Z0 i my-row ;; the row of the intersection counting from the upper left corner of the0 K7 L8 Q) c5 ]
;; world. -1 for non-intersection patches.
- [! ^% V2 {: Z, W; o& x9 x my-column ;; the column of the intersection counting from the upper left corner of the
, V9 M! T0 `9 G ;; world. -1 for non-intersection patches.7 L4 p) A# Z- K M6 |
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
p1 S8 N1 R8 x7 W) l* n2 k: e auto? ;; whether or not this intersection will switch automatically.
; N3 c8 e- i9 g! k+ O ;; false for non-intersection patches.3 m. H/ @2 K2 ?* }$ R- y' r9 O
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;;;;;;;;;;;;;;;;;;;;;;' k e' z( T# T. W
;; Setup Procedures ;;
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' O; d4 R) V; u# g;; Initialize the display by giving the global and patch variables initial values.
0 v; k! d* H9 W, T E/ c6 {4 |; _;; Create num-cars of turtles if there are enough road patches for one turtle to2 a, T' C$ P, U! M' N* z) j
;; be created per road patch. Set up the plots.
; |" M3 R0 z' y7 p& Bto setup
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setup-globals
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' O& G! U. k; h$ i. J ;; First we ask the patches to draw themselves and set up a few variables. V3 u ~& ]- \9 A( e$ \9 }
setup-patches
; m0 `, S" Q3 w. Z# Z$ V3 w make-current one-of intersections
# M. v- Z. a. `2 |. ? label-current! f2 [+ e, ^1 {$ M, y
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set-default-shape turtles "car"
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- R; W K3 [8 A% B! q" } if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "+ |; x) x, F* b( v
"road. Either increase the amount of roads "
9 x% B- a9 {5 y N "by increasing the GRID-SIZE-X or "
3 X; f( d& d9 v "GRID-SIZE-Y sliders, or decrease the "7 R' U4 e) l" K6 ~
"number of cars by lowering the NUMBER slider.\n"
8 h8 u0 L6 P4 S; r/ J7 U! H: A "The setup has stopped.")
% p6 |% N: I& ^1 A8 K stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color, D1 ?- O! x$ T# ?/ C/ f# {
crt num-cars
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setup-cars7 b w8 r* T! [( _6 ^1 Z9 |
set-car-color5 C/ c+ i! F+ a% D+ z- r
record-data
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4 c$ C( S4 r7 G/ g ;; give the turtles an initial speed* \& V5 k, H% D
ask turtles [ set-car-speed ]% R! n+ Z% p/ Y; y8 Z5 b
. x% `- T8 O& B reset-ticks
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G/ C8 L1 p) o; t* n;; Initialize the global variables to appropriate values
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set current-light nobody ;; just for now, since there are no lights yet
) P3 B1 V A, b, t; p6 T set phase 0
; P/ u( ~" y1 E9 }. ~ set num-cars-stopped 0
, U9 l6 [5 @* u+ W- w, H t3 O1 R set grid-x-inc world-width / grid-size-x
% ~" b, B O3 u9 k' V) b# O set grid-y-inc world-height / grid-size-y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
) N4 s M7 h8 @4 e; t9 ^" L- G set acceleration 0.0991 f, b5 i0 d; ?2 s7 v
end
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
6 |# |% {* i/ g3 K;; and initialize the traffic lights to one setting
: ^$ _. p- \/ D5 ^" M0 e' D8 }to setup-patches1 H; t: u; i. R* L# u5 F6 y
;; initialize the patch-owned variables and color the patches to a base-color5 ]" p* K$ K- D \2 S
ask patches
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+ w1 `% z) }$ r: d9 M( u0 _ set intersection? false3 a1 V1 a- D2 q: h
set auto? false9 O8 ^2 s. ]" F* o
set green-light-up? true8 W. a# y- V8 F) U" n y8 R
set my-row -1
0 s3 Z9 s2 E$ t0 |, M set my-column -1
& c; ?; J1 c& [! k. b ] set my-phase -1
, Y2 j2 {% E5 y. k set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
- ^0 s0 H8 E5 t7 E$ N set roads patches with. @/ ?/ f* Z1 z3 f+ Q
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or1 t9 h4 ^$ G! \
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]- U2 Q" @6 r5 {! r0 u( X I
set intersections roads with& O @2 l8 o8 A+ u, z
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
: w; C3 D1 ]' I; x! w (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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% N# K2 X6 q4 ~ ask roads [ set pcolor white ]
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end
5 \5 [8 u6 B* y( |其中定义道路的句子,如下所示,是什么意思啊?& D/ ]) d' T" U' l" K+ T# r9 f4 R) S
set roads patches with
' P' e3 t" I) w5 P O/ ?. c1 g [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or4 u/ U% L2 g0 [. {1 Q2 h4 }' [
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) f0 [- `3 R: a: U4 K" W
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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