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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。- R. x: ]+ m$ C1 ~- |* A/ L1 t9 `
netlogo自带的social science--traffic grid这一例子当中,
}- F7 J3 q$ p1 e7 Oglobals
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! c* Z; o- m8 E8 [ grid-x-inc ;; the amount of patches in between two roads in the x direction$ K# Q7 r( d6 y* D' e7 `1 D0 j
grid-y-inc ;; the amount of patches in between two roads in the y direction2 X& p' | F. z1 v
acceleration ;; the constant that controls how much a car speeds up or slows down by if
9 w; ?0 ^5 P" B& Y% i7 Q0 Q ;; it is to accelerate or decelerate
8 R. h3 R, E1 ^4 R phase ;; keeps track of the phase
( ~$ B0 {9 T6 w- {! W9 | num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure7 n- ^2 C1 l7 U* C2 ?9 b/ W/ d- ^
current-light ;; the currently selected light$ W t% U+ q( o7 [
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;; patch agentsets+ R4 N/ l' U+ [. L" P; w
intersections ;; agentset containing the patches that are intersections
9 h' r {, ^* O& s( A1 E roads ;; agentset containing the patches that are roads: k2 l; {1 ]' S6 g
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! ?$ O8 m* m( s: B+ [% ~4 }# M* iturtles-own
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speed ;; the speed of the turtle! k" r/ H6 n( J9 f; D; `3 \
up-car? ;; true if the turtle moves downwards and false if it moves to the right$ t0 Q: }0 g* Q2 T8 {5 G
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own8 G. D n6 }3 m. O) I9 C
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* P" `1 M( I8 Q* v/ e( K intersection? ;; true if the patch is at the intersection of two roads4 \) ^- b d Q' S9 y+ y
green-light-up? ;; true if the green light is above the intersection. otherwise, false.( U( A+ g! ]# m2 j1 m2 {
;; false for a non-intersection patches.
3 Q$ q+ n8 y3 @$ T3 n( x my-row ;; the row of the intersection counting from the upper left corner of the4 z( ~7 [9 k+ V8 l3 _% ~" y' k: A8 e
;; world. -1 for non-intersection patches.' B. b& a% @$ G {$ W5 v
my-column ;; the column of the intersection counting from the upper left corner of the: F7 l9 o! W6 i& j6 v
;; world. -1 for non-intersection patches. V! x$ P2 n; K
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
. `2 i* X2 D2 e0 q+ ~ auto? ;; whether or not this intersection will switch automatically.% H+ P2 b9 O& G( c, O
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;' L. c9 v6 n2 e
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
( ?3 ^1 U7 f6 R% i( [;; Create num-cars of turtles if there are enough road patches for one turtle to
* Z; B$ ^/ `0 R1 [: q: Y3 O;; be created per road patch. Set up the plots.
5 b9 ?1 V: R u) ~7 }3 l6 R% Ito setup
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables
5 e* I0 \9 d8 b8 _. ? setup-patches
1 e' N8 \8 l5 \ make-current one-of intersections1 c: s: z9 h9 `& u( Z
label-current8 d. c# G% }( w7 _* U- `- h
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set-default-shape turtles "car"
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if (num-cars > count roads)2 h; z2 t! {* X8 }, i
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user-message (word "There are too many cars for the amount of "2 N* n S5 n9 v6 v! p3 U, Z
"road. Either increase the amount of roads "& D2 Y) W; q1 j7 M( t
"by increasing the GRID-SIZE-X or "' k5 `0 V2 z1 D
"GRID-SIZE-Y sliders, or decrease the "/ l) O( L; k- n5 @1 q7 Z& }
"number of cars by lowering the NUMBER slider.\n"
7 P$ l" J |9 ~2 Y7 c' t) r% D( w' i "The setup has stopped."). ]( y4 k4 n- E4 u, ?- W& O
stop0 F K; k# V7 P4 @( _$ b9 Y+ F
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z$ ~. o0 @" W. b/ ~: y; P ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
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setup-cars3 W0 V' b! }$ ? V- I# m. l- T" H# H# f
set-car-color
! w6 }5 R7 n O& E record-data. r8 G; D4 a: |
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8 c1 y" A- \5 v ;; give the turtles an initial speed( P' M+ }( B0 h
ask turtles [ set-car-speed ]5 K/ A* J0 B3 |
, K9 G! n+ M1 W7 ?/ E+ X5 t" j reset-ticks% }. ^1 S& T4 i' M! T
end
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9 i6 E* A, k: @5 G& m3 q;; Initialize the global variables to appropriate values* F, M7 o1 ~, G1 I. f2 F
to setup-globals
0 W1 L5 l/ {" |0 j5 F' o5 e( ? set current-light nobody ;; just for now, since there are no lights yet+ c! T$ Z4 u) \# N; O5 g2 ^
set phase 0
- r2 |' {0 g K set num-cars-stopped 0" h7 ~6 v$ R/ P- m1 F( @
set grid-x-inc world-width / grid-size-x8 ]: T7 B# l' c: m! x: ~4 d2 ]. y
set grid-y-inc world-height / grid-size-y$ {0 v1 z( a0 O+ 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
% x8 p- h3 N$ M, T Z9 G4 j2 | set acceleration 0.099
' P( d& z6 Z Y( n8 m0 kend
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% Q! r$ p9 K$ S5 g! P/ p;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& f5 V( K3 d1 p0 x# P: F
;; and initialize the traffic lights to one setting
9 g' X, d3 C; U; }: Zto setup-patches
* c4 B# R# Z$ i0 `" X/ a& A& r, @ ;; initialize the patch-owned variables and color the patches to a base-color
. S7 J+ k) S6 r, v& h& Q ask patches4 q$ Z$ m! m; D3 [; Y
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set intersection? false1 t6 b, p. G% m2 }
set auto? false: M {( H: L+ Q
set green-light-up? true
' M+ p! u4 v, Q; S* i7 q0 p6 J6 V set my-row -16 m; n9 ^5 `" h) `' ?% G0 `# T4 j% Z
set my-column -1
3 M' Z2 Y: m" [" u7 [0 F' D( ~ set my-phase -1
+ d/ q q- s$ I5 q0 [1 _3 ~2 \ set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
6 B: ]1 p) Y) U& ], e6 ~; {5 G( @ set roads patches with
6 U, w) {, c) f% w9 @ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 l) B' d) d' @% Y- t. k& d
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]- M3 W% F) z3 g) ]' p- w, N; @
set intersections roads with
% J! c o, F& w Z- Q/ u [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
$ X: I, t" U9 f" _1 n# Y- w0 D (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
0 M, v+ U! V+ Z. G; x! R# _7 Y& K 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?
2 D4 ^% H4 ^! `/ T$ ?; | set roads patches with
8 Q; ?$ N) n( X% @' b! v! ~: E [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; m- p( N$ U$ ~% @ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]" J3 @/ x `2 b( N1 g
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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