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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。
3 R3 l5 v) @- G0 z7 Ynetlogo自带的social science--traffic grid这一例子当中,2 {9 j3 K4 i& {9 C+ r6 ~ t
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction
/ m* G9 s, I3 d9 K7 d1 j grid-y-inc ;; the amount of patches in between two roads in the y direction
K1 S& `8 y P: E5 L5 N0 k L( S acceleration ;; the constant that controls how much a car speeds up or slows down by if* {& s0 |# G6 S# \/ U4 M$ ]
;; it is to accelerate or decelerate' [5 ]+ e( G9 \* e" c5 l
phase ;; keeps track of the phase+ M9 \6 Z/ W7 x0 O
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
+ g9 ~; [, T' b$ P) c( x) p current-light ;; the currently selected light
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9 ~) B C$ Q! I" c7 _& ^6 u, { ;; patch agentsets. p: i: J- ]( v
intersections ;; agentset containing the patches that are intersections
& G; b+ V) _$ m9 ?4 q1 H I roads ;; agentset containing the patches that are roads% F. z$ \# }6 T5 R, i
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turtles-own
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speed ;; the speed of the turtle2 X- `0 F6 [0 L4 I
up-car? ;; true if the turtle moves downwards and false if it moves to the right' D$ O# d8 j; H, @! L8 x
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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! v. {+ C3 y- \) l- G intersection? ;; true if the patch is at the intersection of two roads
9 r" O/ I0 P7 T0 g- _# T* I8 _' D0 S green-light-up? ;; true if the green light is above the intersection. otherwise, false.! b. M: n) ?6 \4 `- Q5 R
;; false for a non-intersection patches.
: z! a0 V; V1 m6 H" u my-row ;; the row of the intersection counting from the upper left corner of the+ M/ R2 x" R& h2 I7 s) v0 ~. U
;; world. -1 for non-intersection patches.# o( f% q) `( }( B1 t& S9 S9 P" x3 Q
my-column ;; the column of the intersection counting from the upper left corner of the
$ H, b4 e, ^, A ;; world. -1 for non-intersection patches.
6 ~' n: m' v2 z my-phase ;; the phase for the intersection. -1 for non-intersection patches.
0 P I' N8 e' f7 V1 `( P. W auto? ;; whether or not this intersection will switch automatically.
7 ^- X; s" w. ?, r$ u( p* s& F ;; false for non-intersection patches.
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% ^% R7 d+ \* B- U;;;;;;;;;;;;;;;;;;;;;;% ~* g5 i) V( f" v+ i7 m
;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.+ {& L, G' q" ?" a2 [
;; Create num-cars of turtles if there are enough road patches for one turtle to% Y4 _7 G$ h }# o) C( B
;; be created per road patch. Set up the plots.% i' G, P9 H9 X% z j: f4 m
to setup( ~3 ]) ~3 c2 h9 m: n3 R$ K3 l
ca
% { e! ~2 S. X( k' S8 F setup-globals. a; {; x( K2 z% Y+ g8 T
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;; First we ask the patches to draw themselves and set up a few variables
6 U/ `, o4 m- z; e( q setup-patches5 u) P* q! R1 v8 \' s: }5 t
make-current one-of intersections
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% a# e O9 f8 I: a( H8 h% J1 D set-default-shape turtles "car"8 r1 C. d# h% Y; _3 q
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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 "; j* ^- x6 [) ]' K% F/ r1 G7 \
"road. Either increase the amount of roads "" B1 ?* ^- S5 `6 ^! f. C
"by increasing the GRID-SIZE-X or ". F; `; x2 F8 X! s
"GRID-SIZE-Y sliders, or decrease the "
' M- x* U; y+ x; }$ s8 P6 s" T "number of cars by lowering the NUMBER slider.\n"5 g1 `2 n. Q+ `' d/ `7 g
"The setup has stopped."), Y9 Y' c3 k* c C
stop
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- L o* d# Y( a; @ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( G" J- T; a. |* b8 g$ N
crt num-cars3 b: P8 C, g/ l0 ^
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setup-cars
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record-data8 `$ X& L/ _+ I+ V
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;; give the turtles an initial speed
4 z; m0 y, D. I0 p9 D ask turtles [ set-car-speed ]
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0 V& `' W1 L' H' G# T+ h reset-ticks- q2 ]" U* ]& r2 r% N
end
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% t% S; _& y9 T2 }5 Z- l& w# l;; Initialize the global variables to appropriate values" F) C( s7 u; x/ v! Y! X
to setup-globals
7 W/ U! X# p* a: b& a set current-light nobody ;; just for now, since there are no lights yet
! C' X' Y* N2 F set phase 0
I0 i) d9 ?- o. E4 Q1 v, Q set num-cars-stopped 0& u6 @/ [ [6 O) b8 B$ C. f
set grid-x-inc world-width / grid-size-x
3 ]3 U3 ^( B' v1 O set grid-y-inc world-height / grid-size-y5 d) k, I; P* K9 `3 D! T' ]9 u/ D
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary. a6 Y5 K, W) B' J5 p+ Z/ e
set acceleration 0.099 l3 `4 \* Y. N
end$ K, `" ~0 j9 h, p
( G. z* N: Q6 j$ l" \$ W* e;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
. D( b# E5 Q' f# T% ~ C- P;; and initialize the traffic lights to one setting
, F+ |* l3 y- u" X6 D( ~to setup-patches/ |% c( e2 G% A6 g5 i. N9 O
;; initialize the patch-owned variables and color the patches to a base-color5 e# H4 U1 K: z. ? J5 \0 t
ask patches
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set intersection? false
R9 Z' P# A# t9 t* K; W set auto? false5 _6 R$ k6 b% s: Q
set green-light-up? true
3 ]( C8 g' V9 ]2 v5 q9 A set my-row -1
2 |! e) s$ y6 U; p1 a set my-column -17 a" u9 V; h0 K* h' a
set my-phase -1
3 z0 d- G9 t6 Q) m9 S% I) s, t9 n5 W4 [ set pcolor brown + 3
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/ H& r6 k& N* [1 L/ b ;; initialize the global variables that hold patch agentsets* ?) t/ C1 E6 c- m) u2 ?# r- i$ d: C
set roads patches with/ X5 @* I: G, N- R. s2 H) G
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
2 ~$ J2 _/ t* g7 p9 K, Y! q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ x1 a3 X7 T8 A) a7 Z( P( h7 S
set intersections roads with+ m$ n& f( J& p
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
6 A& l2 ?* }, K4 K (floor((pycor + max-pycor) mod grid-y-inc) = 0)]. u4 d/ i/ \$ ?$ V1 A
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ask roads [ set pcolor white ]
, Y% x6 V' a5 X2 y* b setup-intersections( b& `. ?- z5 U! o) r, N
end* i; K$ ~; c l8 b& g; s; K
其中定义道路的句子,如下所示,是什么意思啊?
4 l4 y8 M4 W; P set roads patches with
; V/ q" D6 [: ` [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 t: {+ J* N6 e g9 j0 Z5 l (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
+ W2 ^5 W* u. 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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