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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。
2 T. h% N2 I% X+ X8 h6 enetlogo自带的social science--traffic grid这一例子当中,) _. Q$ |9 R* I6 {" ~9 f! Z
globals0 ]3 o& @3 N/ B0 D
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grid-x-inc ;; the amount of patches in between two roads in the x direction/ v% o, v" Q8 l' E1 T
grid-y-inc ;; the amount of patches in between two roads in the y direction9 U& V/ K* [) G9 o$ {6 N, _2 U
acceleration ;; the constant that controls how much a car speeds up or slows down by if
/ N" q1 j; s- e% C. R# @- l" L ;; it is to accelerate or decelerate
1 m3 {& p% g* @: Q) a2 G phase ;; keeps track of the phase
1 P" x- }# r3 W" J9 E$ H num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure& ^! Y& p! u: ^. w1 m; y
current-light ;; the currently selected light; F8 d- L* Y* Z2 r4 y
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;; patch agentsets& X! E# e/ y8 N
intersections ;; agentset containing the patches that are intersections
: F/ p8 u; ]: |6 _ roads ;; agentset containing the patches that are roads
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turtles-own$ n" ^! F" i9 A- r6 N- W: O& F
[
- m" `, O+ x3 X! f8 a5 U speed ;; the speed of the turtle
: M# P6 e9 C1 N$ S up-car? ;; true if the turtle moves downwards and false if it moves to the right1 V6 x9 U8 Q2 e/ W0 M
wait-time ;; the amount of time since the last time a turtle has moved+ [1 x1 R. |0 Z
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patches-own
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2 j, X- b; f& q9 j( a8 \ intersection? ;; true if the patch is at the intersection of two roads; j, T$ q0 n. U& R* Q! v# r; m6 V1 P
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
' p5 {' E" B: O7 `- k: j& v7 ] ;; false for a non-intersection patches.
/ g5 A- \6 E" L. n& @* b my-row ;; the row of the intersection counting from the upper left corner of the5 p* Q2 L" t5 j* l7 e/ k
;; world. -1 for non-intersection patches.# P3 ]2 D0 v* ?% Y2 t
my-column ;; the column of the intersection counting from the upper left corner of the- y5 {7 P$ H: X+ q( ]
;; world. -1 for non-intersection patches.! ]. d+ K+ q5 ]/ O: P: V8 w2 c: @
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
. W4 a# ]! j# _/ U0 ]% z auto? ;; whether or not this intersection will switch automatically.
: a' l4 ^+ G$ ~2 z ;; false for non-intersection patches. L* g* h" v" N
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;;;;;;;;;;;;;;;;;;;;;;- v$ ?3 L5 |8 O
;; Setup Procedures ;;
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. B8 U$ W* {4 N9 W;; Initialize the display by giving the global and patch variables initial values.# e% l$ `$ I: F" E
;; Create num-cars of turtles if there are enough road patches for one turtle to( X! h V/ B7 l
;; be created per road patch. Set up the plots." Z4 O% d% i: G u# `7 f
to setup- i; N: a d8 o1 t8 O) t
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setup-globals
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( w& S+ a$ g$ i5 f: n+ R0 H* e ;; First we ask the patches to draw themselves and set up a few variables
8 z: N4 O% f: d/ Z setup-patches3 e+ u/ l/ V5 |" E$ u
make-current one-of intersections' z) V/ c! ]7 I- m* i
label-current
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' }$ P& I) F8 {" F; [+ a* @5 _ set-default-shape turtles "car"1 R7 X. R; w o4 _* U
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "
, X4 r% G6 \/ Y4 L "road. Either increase the amount of roads "$ D. N3 F2 ?: ]0 T9 n
"by increasing the GRID-SIZE-X or "8 v* z) _8 _4 l6 w
"GRID-SIZE-Y sliders, or decrease the " ?0 c; R! S: A9 o
"number of cars by lowering the NUMBER slider.\n"
7 b1 h9 ]! H V8 M7 N* _ "The setup has stopped."); ?+ [/ V) I# f9 t9 o& J" d# Q
stop s" @* L( x8 [$ Q/ r
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' p% [, s A, _7 t ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color9 w) Y- K9 y) V& ^
crt num-cars
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setup-cars2 W! I0 q5 f G1 L2 R
set-car-color
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. T+ o$ c% y5 \5 Q0 V5 X ;; give the turtles an initial speed" S- l$ @) j! o8 |) e
ask turtles [ set-car-speed ]( N; W5 H, @2 i; w9 c( k
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reset-ticks
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;; Initialize the global variables to appropriate values
2 \% q$ \0 I0 g1 c: _# ], m' V6 j \to setup-globals
4 o$ E' \+ U4 R+ k set current-light nobody ;; just for now, since there are no lights yet+ E- ^# B" |7 ?8 m
set phase 0( f4 P/ d1 A) o8 `
set num-cars-stopped 0$ X* H% D% \% V- e. A
set grid-x-inc world-width / grid-size-x3 ]$ K9 M$ k0 m
set grid-y-inc world-height / grid-size-y
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3 g( S' X& N4 B3 ?+ V: U ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary6 f7 _3 a; [2 M9 q; J
set acceleration 0.099
, `3 g4 s! h* D) s. iend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,: q. c% _) a$ X3 a5 B( r% |
;; and initialize the traffic lights to one setting' q4 L X! ?/ D' n- a. K6 t" ^0 q
to setup-patches
. _. i& B: h8 @" k( [ ;; initialize the patch-owned variables and color the patches to a base-color
X" W; t ?4 p ask patches
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set intersection? false
6 j- w3 S9 B2 B2 R9 ~- |, r set auto? false
% F* P* q; \# {8 P) G) [ set green-light-up? true" a* U' _8 w- r
set my-row -1* y2 Y. M$ o* D, V$ B4 r
set my-column -1
) [$ x' y+ O, q set my-phase -1
0 ^6 C+ ]4 J, F' B/ i set pcolor brown + 3" o0 W* [' @" Z' [# S- v; B4 M
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& U" i/ Y6 {% d, U: k( O U ;; initialize the global variables that hold patch agentsets
6 e$ |7 H; |% H9 A: C set roads patches with
3 J) t! N1 ~6 s [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 o. c* d& k2 L' F
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]1 ], g/ ^8 s9 I
set intersections roads with& i9 ?4 G9 @6 l9 A/ w
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
; O4 b9 E* N3 c: h8 s+ q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]: ~: B/ z# ] a
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ask roads [ set pcolor white ]2 h q" j4 h4 `' F) N
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?
$ m4 z6 V; `5 d. b set roads patches with3 |( j0 G0 a+ g8 }& F& f
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or# T: s# a& t' k: l/ y9 q0 s; U
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
* R! h& ]8 Y! l; R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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