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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。9 I: l; m6 d% b8 _4 x5 C
netlogo自带的social science--traffic grid这一例子当中,
9 T6 l" W9 _0 K# D! r! ^" Bglobals* d( u! U" c2 w( u- h2 C/ z
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( d- z/ u' R+ v, O grid-x-inc ;; the amount of patches in between two roads in the x direction" W5 @' ^# {; w4 F& g1 A& D9 Q/ X
grid-y-inc ;; the amount of patches in between two roads in the y direction, W' y/ E& O9 u9 N% v7 }
acceleration ;; the constant that controls how much a car speeds up or slows down by if; ~* U2 U# Y( R' o1 Z3 E
;; it is to accelerate or decelerate4 {2 g5 K5 z& l; Z$ T& e. n1 Y
phase ;; keeps track of the phase
r& i3 ~2 Y2 F% Z9 M num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
( Y, i& u! f& X& I3 S5 E current-light ;; the currently selected light
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# }( ~8 G# D" `) J9 C ;; patch agentsets
7 M! _/ `' c9 r) `( [ intersections ;; agentset containing the patches that are intersections$ L; S4 R4 n# |6 ]
roads ;; agentset containing the patches that are roads
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! v2 h2 z# }' N& f6 Gturtles-own
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speed ;; the speed of the turtle& f' f) F% E0 N# U1 G# I
up-car? ;; true if the turtle moves downwards and false if it moves to the right
+ g7 l. c% d. v/ A0 U wait-time ;; the amount of time since the last time a turtle has moved
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patches-own' b; z/ F6 y$ Y" Z! t' ? I
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intersection? ;; true if the patch is at the intersection of two roads
8 u0 z5 M7 h4 ~! x green-light-up? ;; true if the green light is above the intersection. otherwise, false. S% @, x) s! g7 s0 o8 U3 ?
;; false for a non-intersection patches. Y! W* b2 S- e' ^/ E' t" u
my-row ;; the row of the intersection counting from the upper left corner of the6 B& X8 j9 {+ v+ x! e: {8 [# }+ `- Z
;; world. -1 for non-intersection patches.) x. Z& `/ G$ O5 }5 Y- W1 z
my-column ;; the column of the intersection counting from the upper left corner of the
! g6 D j* `/ G) x ;; world. -1 for non-intersection patches.; w5 E+ l% ~0 N g, ]( J) V* e5 N
my-phase ;; the phase for the intersection. -1 for non-intersection patches.& C b; X! }6 p2 Y# ?5 G
auto? ;; whether or not this intersection will switch automatically.+ e) y- c _( r" l5 {0 C8 \
;; false for non-intersection patches.. {9 i! S7 m# m5 j1 }; V% C
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9 l: H0 b. T% `' {! o2 k: s' b;;;;;;;;;;;;;;;;;;;;;;
* S- Q0 u9 ?; h" G* Y;; Setup Procedures ;;2 b. Y s% A# X; j R) F) l
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.9 U1 c) `) ] H8 ^' S
;; Create num-cars of turtles if there are enough road patches for one turtle to
3 l+ R6 j% I! T ?;; be created per road patch. Set up the plots.! e! I6 s( }5 p" G$ Z- K
to setup
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& @6 O: @' U: R setup-globals# w+ x( M: H# s
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;; First we ask the patches to draw themselves and set up a few variables) d+ l+ [& F( K6 f# r6 g8 f' ]6 H
setup-patches+ _9 t1 ?- L; X) S
make-current one-of intersections5 F# `" j% ~$ I, z0 ]( [
label-current
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set-default-shape turtles "car"
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2 f+ o& k2 p, \6 L) ?6 W1 w if (num-cars > count roads)
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) J/ ?" m! f2 w9 ?, l' h* r& F user-message (word "There are too many cars for the amount of "
# ]9 Z% E5 }+ K+ ~- y; l "road. Either increase the amount of roads "' {% t1 ], a) T6 \, \
"by increasing the GRID-SIZE-X or "
g5 F8 p- \" K "GRID-SIZE-Y sliders, or decrease the "! E8 q% [# Q9 j7 U% [
"number of cars by lowering the NUMBER slider.\n"
! Q" r3 M8 e8 O. O( B "The setup has stopped.")
/ K' D$ n T. v6 o- A. ?6 |7 p stop& y. e- @4 W4 D7 `, b
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color% f3 w9 s4 k5 Y- ]* U% K' ]
crt num-cars/ d( ]/ W9 t r! l
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* x5 c6 V9 Y: J9 b9 S: `/ a7 n4 X/ o set-car-color+ V1 q5 P% N. B. y2 J4 g0 P3 m
record-data( s$ M! [% J Z* {7 _; ^- Z4 a
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# K# ? a! c+ @5 g ;; give the turtles an initial speed2 m( Y G5 N0 M
ask turtles [ set-car-speed ]$ l1 H6 P) I) |0 t1 u. r/ @5 U
z, p; w; I& W$ L$ V: @ reset-ticks
7 Y) N8 l' b0 |4 H$ Y* wend) p$ w* [; q+ Q7 o: R
, [( }" S1 P4 B2 \;; Initialize the global variables to appropriate values
7 @- T8 ~1 x0 q8 M& ?/ I# {to setup-globals N$ c" o9 z8 `5 L
set current-light nobody ;; just for now, since there are no lights yet% n: d/ u0 A$ J1 K% |
set phase 0
/ T( Q0 q4 L0 ]7 q( [- Q- {* L set num-cars-stopped 0
, m. d4 U. h; |" C* S7 i: B set grid-x-inc world-width / grid-size-x
2 d% z. v0 z4 x set grid-y-inc world-height / grid-size-y) ]; H/ u! k0 v' F" l
1 q( ]+ K5 Z8 K) R5 `. \9 p ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
$ A2 m F% h7 ]0 h" c set acceleration 0.099" X8 X$ L W/ P6 r& p/ y
end- B F8 @: P8 p/ m( r; P
9 S' l/ R& } }# ^ V7 I4 e, s;; Make the patches have appropriate colors, set up the roads and intersections agentsets,* n; c3 B9 c" [+ i
;; and initialize the traffic lights to one setting" Y! f2 D" Q( E) U% h0 \& l
to setup-patches
6 ?( @5 o. E+ t9 V1 B, A/ V6 b: Q ;; initialize the patch-owned variables and color the patches to a base-color+ G7 b" X# u/ E3 |" V
ask patches# u. C/ m3 h' Y0 B c0 D, D! R+ E; a
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9 M! w# |+ _7 k0 h set intersection? false9 a9 Q$ z% Z, V* w* l
set auto? false* T( d; K$ l+ f+ Z* ?5 Z; ^. v
set green-light-up? true; b/ @. Y3 y- x. J& e2 a8 V% |- g
set my-row -1' Z- b9 c5 x) l1 P, z+ X* z: O) P
set my-column -1' W; z1 D3 o) T7 ^5 `5 Z
set my-phase -1
! s/ M% H- k8 W1 ~ a$ F set pcolor brown + 3
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/ a p$ p6 O! n ;; initialize the global variables that hold patch agentsets
. M1 Q1 ?0 ~4 `2 J' l set roads patches with
+ A) }- R* j1 ?; V# l [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
7 T) `$ c o% B' C O# I" M (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& \( U9 Y, O. I; a; U
set intersections roads with
/ P- Q: U3 K' ^' }2 X& m8 a) B+ y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and: s4 o' B( f! [5 }, p& G ~
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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" ~5 N3 L0 _) V4 b! W& z2 { ask roads [ set pcolor white ] N! x1 a6 r8 {5 W3 B
setup-intersections9 c& Z6 e& A1 O2 T$ ?
end
: Z1 _8 E+ I, b R7 q其中定义道路的句子,如下所示,是什么意思啊?
7 ?: R1 m# a- Z% P* u set roads patches with/ b; R% G- ?- p# ~
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 ~* }7 \, }6 X
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
U: `( B# \* a2 u7 j5 \- d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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