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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。
* A1 v+ P7 C* W7 G6 Inetlogo自带的social science--traffic grid这一例子当中,3 X* e$ ?7 q6 x7 X' h( h& q0 }
globals( F! H# Q$ @8 e! E5 U# m
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grid-x-inc ;; the amount of patches in between two roads in the x direction
: V- q: @" L5 Z; A grid-y-inc ;; the amount of patches in between two roads in the y direction
3 K; O7 l5 r+ c acceleration ;; the constant that controls how much a car speeds up or slows down by if
+ K1 n- V6 W6 l0 c6 C' H% n ;; it is to accelerate or decelerate( x! m1 ?+ {( K$ `% M& P( F& N
phase ;; keeps track of the phase, X N @7 B D" s6 @+ u
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure( o+ i- s% c3 R% q( k
current-light ;; the currently selected light
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;; patch agentsets
& Y j+ Y& `' G intersections ;; agentset containing the patches that are intersections! W$ u' ?$ B& k& Q
roads ;; agentset containing the patches that are roads. y5 v& B, ?1 D2 ?8 e; ?
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l8 f" _9 Z g' h( k: g- Y( w6 Cturtles-own
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speed ;; the speed of the turtle
1 |1 T* L4 h l' ]% S/ P up-car? ;; true if the turtle moves downwards and false if it moves to the right% ~9 Z9 W6 t# _* w! W9 l# b
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads
8 s: Q6 q- k, {; q3 ^* x! N green-light-up? ;; true if the green light is above the intersection. otherwise, false.
7 s, h0 S8 g6 }0 _1 z- R6 ^( @ ;; false for a non-intersection patches.$ C4 S( u8 W w) _
my-row ;; the row of the intersection counting from the upper left corner of the
6 _8 J, T/ Z7 q9 q# c ;; world. -1 for non-intersection patches.* |8 x- S( W" |: d3 n
my-column ;; the column of the intersection counting from the upper left corner of the
- y& `$ ~$ R: z; b" Y ;; world. -1 for non-intersection patches.# ^5 _. Z; U* n6 e0 r
my-phase ;; the phase for the intersection. -1 for non-intersection patches.- U& _6 c6 t5 c2 M+ R; `7 Q/ g
auto? ;; whether or not this intersection will switch automatically.7 J( k3 r( q O
;; false for non-intersection patches.
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W( L4 U- `3 K% c;;;;;;;;;;;;;;;;;;;;;;
) \9 i l! R) B g: E# d3 O8 D;; Setup Procedures ;;8 B. e |; c, s7 {
;;;;;;;;;;;;;;;;;;;;;;
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;; Initialize the display by giving the global and patch variables initial values.4 D! ?# c& x+ `6 @2 o7 U! H
;; Create num-cars of turtles if there are enough road patches for one turtle to* |: D! B7 ]& y; m7 w, h
;; be created per road patch. Set up the plots.
5 ?2 N) |3 v6 [: Uto setup
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7 J1 t& g6 s7 r; @6 C setup-globals% w% z% I4 B. q6 A
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;; First we ask the patches to draw themselves and set up a few variables9 V9 B; V) N* g0 k
setup-patches
) e( V+ I1 u4 M/ X5 y5 t. [ make-current one-of intersections& t$ W& K) B. J. ~+ D B
label-current
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set-default-shape turtles "car"
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& }9 E, \( P+ W) q$ j) W if (num-cars > count roads)
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" f6 K/ M0 G A6 s' E user-message (word "There are too many cars for the amount of "
/ S& [8 f6 d8 K" L ~6 \! }3 y "road. Either increase the amount of roads "% j2 a( I$ V' r" s) g+ C# K) t* G
"by increasing the GRID-SIZE-X or " r& W9 O' g8 [' F7 a
"GRID-SIZE-Y sliders, or decrease the "' ]; E6 B8 c" z2 O# b7 L v
"number of cars by lowering the NUMBER slider.\n"3 ~; y1 u. C) c
"The setup has stopped.")& L( m7 o$ u; m
stop
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3 `0 {5 r& \& e1 K ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
# l" {, G: @4 Z) z) m5 o: R" H$ z crt num-cars9 `, c5 R. I' \5 a3 y; U' i
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setup-cars+ t; i5 n7 ]2 ~9 f5 z
set-car-color$ c) }- X% C# S: V* t0 M" y
record-data& w+ W5 t k% h
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% J# t% r& J& N7 b3 \ ;; give the turtles an initial speed
' f R( m, r5 q- Q/ P ask turtles [ set-car-speed ]
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0 a+ x) a3 E4 z4 R7 I reset-ticks
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;; Initialize the global variables to appropriate values8 u! {( W( V! H
to setup-globals9 }6 w1 k6 {, k& I$ G
set current-light nobody ;; just for now, since there are no lights yet5 S0 A, r( P* a; R
set phase 0
5 m; F" [0 p; k, z set num-cars-stopped 0
4 v( @: O' ?' W: [6 q, v set grid-x-inc world-width / grid-size-x- E* \# C. i* o
set grid-y-inc world-height / grid-size-y* F2 _3 O/ m; a% F! Q# ?5 {# O
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
1 G- j" P7 E& X/ k% L set acceleration 0.099: Q& J( d2 L+ z" \1 D! ^
end' ]! g) F% L% o: P, S& U
1 q6 H2 C7 L6 j) |" @' O' y;; Make the patches have appropriate colors, set up the roads and intersections agentsets,* C0 H& k& ]6 r' ~0 a' Y/ }
;; and initialize the traffic lights to one setting
8 H' N8 x3 d8 Q8 {! vto setup-patches3 ]& j% Q7 v+ U* o9 s: Z
;; initialize the patch-owned variables and color the patches to a base-color
5 @, a1 T' k* l, K5 `3 i; G5 [ ask patches. n7 I8 y6 D7 l& `% A- X
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$ T2 r: I: K: m u4 p: E) R set intersection? false
- I4 W' h, J Q, s; c# B set auto? false
/ ?$ \' E4 t) Z9 o% _3 T set green-light-up? true
! w) t# Q. q1 j8 a+ [( n) W- F set my-row -16 L" n7 j" A- [8 b" M6 y+ p
set my-column -1
" z/ [2 S* S$ s& @( A1 ~# `. A- A set my-phase -1
' f5 n) e! Q P g, c" l( R5 o5 a set pcolor brown + 38 b4 T+ A( `% S7 i% t0 X& S U
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;; initialize the global variables that hold patch agentsets
4 H% c e8 N- Y+ V, @3 ~/ x/ O set roads patches with
9 n; T5 a% P( I1 c [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 F; u- @4 o: I G: L7 \ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 {* l! `. K. u. I9 T set intersections roads with
3 \/ _# `9 A8 |, A1 {. w [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and7 S8 e. B& K5 U& T
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]. \* }5 d7 J; F& Q- z- L1 w
3 ?3 j7 V* O% d ask roads [ set pcolor white ]- z& J- |' T; `+ D
setup-intersections0 p- Z( |/ A) X) N8 ~+ Q
end
% Z2 G5 E( ?. G% g- p% J其中定义道路的句子,如下所示,是什么意思啊?* j& c* D( f( F8 a9 y( |4 U) K
set roads patches with
0 X% R4 B( y* p% ` R7 U7 o3 K [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
5 G4 D* b U" {2 j4 V, O (floor((pycor + max-pycor) mod grid-y-inc) = 0)]9 Y- c, x7 [" D6 a
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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