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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。
! V" Q2 {: C* q& W4 fnetlogo自带的social science--traffic grid这一例子当中,* F _5 g- p2 O' r1 c4 v
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction1 T0 i5 Q' P" D, e# M
grid-y-inc ;; the amount of patches in between two roads in the y direction- W8 w7 I c H; Z% b$ [
acceleration ;; the constant that controls how much a car speeds up or slows down by if
4 t. A+ {9 q; l# d' J ;; it is to accelerate or decelerate
# {- s. w7 Y% j2 u' V phase ;; keeps track of the phase
3 u0 J# c+ S7 f5 N num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
9 d7 H! F- n+ [3 [& m d o% _8 P2 m! Z current-light ;; the currently selected light
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;; patch agentsets% c3 D$ T$ R. \( t2 Y: ]
intersections ;; agentset containing the patches that are intersections7 b( R9 M2 Y+ G; r, V- z3 t0 b- I
roads ;; agentset containing the patches that are roads( V5 `/ n. q1 D7 ?+ E2 N$ r$ h
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turtles-own
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speed ;; the speed of the turtle
( t1 j* e; W; ] R5 H up-car? ;; true if the turtle moves downwards and false if it moves to the right% F, O' i9 c, G% j/ Y4 H7 v) U, N
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own9 a9 F3 A$ R z- L; a% d6 V0 N
[
) d# n1 u! V2 {) e- D/ ] intersection? ;; true if the patch is at the intersection of two roads
) L9 {' ^5 n' }2 t# r3 x green-light-up? ;; true if the green light is above the intersection. otherwise, false.
. p* E, [) ^' w4 a, t ;; false for a non-intersection patches.' |8 [8 o. X# d4 T1 f, U7 Z! Z
my-row ;; the row of the intersection counting from the upper left corner of the
8 |/ t' E$ O# r- N: n ;; world. -1 for non-intersection patches.
) ~. V. u/ n1 O! N) U7 N6 H/ s my-column ;; the column of the intersection counting from the upper left corner of the
! I' v/ S' ]5 A; _3 @* Y ;; world. -1 for non-intersection patches., C3 m# h4 K! E
my-phase ;; the phase for the intersection. -1 for non-intersection patches.& j. q; N1 M4 z! l
auto? ;; whether or not this intersection will switch automatically.: s g- t) H. p& m5 @5 [
;; false for non-intersection patches.% c7 g! ^ K4 ?' I# Z& T9 }; M
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5 F4 i" Y( A' ?4 ]# X;;;;;;;;;;;;;;;;;;;;;;
5 ?5 Y( y7 e" e;; Setup Procedures ;;
2 M* O3 b: Q% {" {' ]( p9 f/ ]8 ~;;;;;;;;;;;;;;;;;;;;;;4 `6 x8 s& A' K* o% [3 H
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;; Initialize the display by giving the global and patch variables initial values.9 B$ |8 T# ]9 k: [# {- ]
;; Create num-cars of turtles if there are enough road patches for one turtle to9 @# T4 c( Q# h
;; be created per road patch. Set up the plots.
3 m4 G$ W, H8 M: t3 k* ~ p& Ato setup q \6 |( e( B0 A! s: L* _: ? `
ca
8 t! ?% `9 h1 w5 L# {7 ~ setup-globals: o* Q, V k# c9 c) e, u
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;; First we ask the patches to draw themselves and set up a few variables& u- h3 J3 b' ]. n# P
setup-patches
7 W- e% K7 `! W4 M0 S9 ?' |, x make-current one-of intersections8 Q# i4 j/ ]) g/ W4 j6 u. Z
label-current
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: f6 l3 m F( S' Y$ w7 `. y/ M0 T set-default-shape turtles "car"
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$ j0 ~! i0 r" C) J if (num-cars > count roads). N% J2 o; S5 H5 t3 `- x+ [
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user-message (word "There are too many cars for the amount of "
' Q2 {- B: O) Y5 `& l, l+ x "road. Either increase the amount of roads ", @' h+ F; H7 F( p& l4 @: J, E- p
"by increasing the GRID-SIZE-X or "% _1 C. N+ \/ S6 p5 V
"GRID-SIZE-Y sliders, or decrease the "
2 j+ J+ U, g% ]8 ~! W "number of cars by lowering the NUMBER slider.\n"3 K; \: n% J' n8 x0 V
"The setup has stopped.")
3 S; k3 k. ~1 X/ K8 n- s stop
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7 q+ g+ v0 l4 j5 T/ v5 x0 ]6 x ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color& J- F S3 u! w+ b T; ]* R
crt num-cars
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setup-cars
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+ Q# }2 @5 `/ O' E" l6 h& {, L record-data; w! J- V" G+ ^! c% j0 k: Z
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& o2 q6 |, j/ l ;; give the turtles an initial speed4 F. T( u7 F1 l& s4 ]( L& [% W
ask turtles [ set-car-speed ]9 w. E+ Y7 K: e8 F, b+ Z0 M
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reset-ticks k/ x( k4 ~( S
end
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;; Initialize the global variables to appropriate values6 ~* {( P/ \, j- n; _: @- x
to setup-globals
' I' v) u+ c. b2 e- n set current-light nobody ;; just for now, since there are no lights yet {& D4 w0 F6 {) f( J9 A3 D8 p
set phase 0
5 k% c6 a6 Z- Y% k R. j* ^ set num-cars-stopped 0, e- a7 c* L% X7 C2 i
set grid-x-inc world-width / grid-size-x4 s0 ? F$ d5 T- F7 t% k0 I7 {
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
* T% u6 S3 [" d, Q. ] set acceleration 0.099
2 B J" q8 c4 U/ z% vend
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+ i2 R$ G: [# t4 G/ \& T;; Make the patches have appropriate colors, set up the roads and intersections agentsets,. E* r2 ]: |: t8 t- z5 Q0 F8 p1 G
;; and initialize the traffic lights to one setting5 L( x k9 q# P& \* ~. }
to setup-patches
1 q7 F& N" ]& G+ ~ `7 X ;; initialize the patch-owned variables and color the patches to a base-color% n9 ? y$ [6 ]: o( L
ask patches
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, n! v1 y! a: c ~ set intersection? false L; X! \& M% C/ w9 P- p; S
set auto? false7 `8 C u- Z9 X4 B! a
set green-light-up? true
* E# K% C/ k8 C/ D- x# _. }$ U set my-row -1 f/ s! n* J( x! r8 w2 s, g& e) k
set my-column -1: ~, H- x5 e5 @$ T/ ^
set my-phase -1
; X' W: _9 \5 S( C set pcolor brown + 3
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' K8 |" ?. A! v5 v5 G ;; initialize the global variables that hold patch agentsets* m4 ^6 x9 I( D' j# L8 X$ v" S
set roads patches with
% L# f/ c* E. G6 y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
+ Q6 z ^ c; G( Y6 g+ ` (floor((pycor + max-pycor) mod grid-y-inc) = 0)]- N4 \; V4 p W# Y2 k9 r3 i4 w
set intersections roads with
# [: ^# h9 R- B [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and3 |" T6 R5 u7 W: ?/ s6 N# X8 S
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]: C4 A. q' H& _) R
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ask roads [ set pcolor white ]: v$ E+ d' y- e0 W
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?& e$ _1 V( i7 T' ? j
set roads patches with
0 j# y# g& j. A+ g [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 Q B4 ]9 S+ H0 ]8 |
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ c1 u/ L4 y4 _" @
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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