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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。) k: l* K/ I5 Q# |$ {
netlogo自带的social science--traffic grid这一例子当中,- g6 v% H& {$ j* Z
globals
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- w* M" F& c! | O! Z grid-x-inc ;; the amount of patches in between two roads in the x direction/ _* W8 `5 G* j- D$ l0 q8 y
grid-y-inc ;; the amount of patches in between two roads in the y direction* S6 ~) u# m8 P
acceleration ;; the constant that controls how much a car speeds up or slows down by if
$ I# I' B7 h6 o. p8 }9 ^ ;; it is to accelerate or decelerate
2 E! e/ K( P- f% D8 l phase ;; keeps track of the phase
" }+ k3 d4 u$ _0 H! E num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
( n( |. j: x0 \# y2 J' C current-light ;; the currently selected light$ z* R# R* R! Z* A- K2 C
1 ]* W- P9 t w4 L7 Y8 e ;; patch agentsets8 O8 k6 i" z( X0 X
intersections ;; agentset containing the patches that are intersections
$ ]" t, a) Z$ W( g0 J roads ;; agentset containing the patches that are roads
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6 m, ?8 S5 b. W- N& Lturtles-own: N- y5 W/ Q% l; W& u1 ?
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speed ;; the speed of the turtle4 s( e9 ~4 |/ h( j( G) m/ d3 ?
up-car? ;; true if the turtle moves downwards and false if it moves to the right9 P1 G% }3 f" ~
wait-time ;; the amount of time since the last time a turtle has moved: s( v1 E* T- ]
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patches-own
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* q' I- ?" D; Z7 o: v/ z7 K7 e intersection? ;; true if the patch is at the intersection of two roads. }4 z' J6 u4 A' C
green-light-up? ;; true if the green light is above the intersection. otherwise, false.- ^# J% f% r: ?# Q/ N- k3 u
;; false for a non-intersection patches.
+ Y1 E% U9 `1 O: y) O; Y my-row ;; the row of the intersection counting from the upper left corner of the
, n' j. \& _6 k! T5 \ ;; world. -1 for non-intersection patches.
( v! B9 w1 ?0 Q9 u9 i( {5 A my-column ;; the column of the intersection counting from the upper left corner of the2 @' S+ Y& G; o+ Z" v0 i
;; world. -1 for non-intersection patches.1 b: L1 R8 ~. A' C. U9 N; ]
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
, R# z. w9 s# T* `- x: A, T auto? ;; whether or not this intersection will switch automatically.5 _+ U }* l1 v1 i" w6 o
;; false for non-intersection patches.* U- q- \2 U6 q1 Z" b' }
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;;;;;;;;;;;;;;;;;;;;;;8 Q8 e2 O. Y+ L2 u, P9 |
;; Setup Procedures ;;# E7 W3 {7 J$ J& Y! h1 Y
;;;;;;;;;;;;;;;;;;;;;;7 ]8 l% d# Q% U4 W" r8 [4 a$ g9 S' F
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;; Initialize the display by giving the global and patch variables initial values.
0 ^+ f7 M3 O! G0 t) Z% x( B' Y;; Create num-cars of turtles if there are enough road patches for one turtle to
5 [* M9 Z- B! X# w5 T;; be created per road patch. Set up the plots. i" s% }" a+ ?3 G
to setup
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1 h6 v) h- C9 R# e" |8 X setup-globals
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: L: h# p; X: u8 B: T ;; First we ask the patches to draw themselves and set up a few variables
& U& ^* Q# t5 E& w5 c9 {& q setup-patches
. P* c& q+ \& p8 G v6 L E' B: O make-current one-of intersections6 u, M5 E: O, m) Q- j2 {% E) q# L
label-current
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* m3 B/ {1 ^' h4 _ set-default-shape turtles "car"
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if (num-cars > count roads)* ^$ h# B( H6 ~. N
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user-message (word "There are too many cars for the amount of "
5 r! w( S' d% f% m& H$ @5 B "road. Either increase the amount of roads "
0 s1 j! b5 r% @( d "by increasing the GRID-SIZE-X or "; `( f; P. U% f4 w7 {0 d' y
"GRID-SIZE-Y sliders, or decrease the "
6 Z% d& d, y# n/ F k! O6 f" a) H "number of cars by lowering the NUMBER slider.\n"
8 H+ q f! y# r8 J "The setup has stopped.")
2 s2 o) P% p- J" @, A stop9 B% W, d( W4 f( @
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* Y( L, C+ W1 U* i# m; t6 R6 U ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color+ i/ E7 d( F3 L( ]- m6 |
crt num-cars5 D" n! H/ S) o. q
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setup-cars4 H5 N1 W4 f2 o. B: ?0 a
set-car-color
& B7 n: {: ]! {) D$ b* ^ record-data0 n& H0 ?$ M" K0 A! I J
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6 ?' f2 G$ U! [ ;; give the turtles an initial speed
/ K4 }1 |; B. S4 ^ H) q8 }+ K! R ask turtles [ set-car-speed ]
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reset-ticks
) Z4 z' \* T4 E% o3 |9 Pend
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;; Initialize the global variables to appropriate values
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) X& a- i- F# K/ `& f set current-light nobody ;; just for now, since there are no lights yet
7 l7 \0 p& D& v+ B4 D; F set phase 0
( n- p: }. P, [5 q/ u% N( d9 Q set num-cars-stopped 0
' c" U) r \$ A' |: p! ~/ a# i set grid-x-inc world-width / grid-size-x6 w0 Y9 |' M5 Z& f! t; p
set grid-y-inc world-height / grid-size-y0 d e& O, x0 F, ?( 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- {: `" h* a! M) B
set acceleration 0.099
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( f w: Z) D6 H7 {/ d;; Make the patches have appropriate colors, set up the roads and intersections agentsets,& @, a6 a4 {& W: y& A' E1 \3 U7 |0 D
;; and initialize the traffic lights to one setting" N7 P8 b6 g3 a$ e1 p
to setup-patches0 r( p; j$ k( B8 R. ]; }
;; initialize the patch-owned variables and color the patches to a base-color
% O' G# w5 a2 j ask patches2 O0 U- D: I3 d8 p7 }) p) l
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: X1 ]0 X5 Z1 `: S$ p set intersection? false- D: Q- t/ h5 a* o
set auto? false
! l( S( {5 V" i9 ]! X( Z5 a set green-light-up? true
+ U, x1 Z! H, n: {' \ set my-row -1" y Z/ v) B3 T+ W- W% R. m& N
set my-column -1- M9 e& k' S3 v4 P2 K/ C; o7 Y6 [
set my-phase -16 v% x1 W% w! n4 ]. h- \
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets) n5 H8 C/ c2 i5 Z* ?
set roads patches with
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(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
# r# r/ Q2 I0 C5 C$ } set intersections roads with4 S8 j4 j5 }$ F
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
: K3 i$ N2 B R: r1 X2 t (floor((pycor + max-pycor) mod grid-y-inc) = 0)]6 e1 D+ J J: `5 P4 p* s
7 S7 n8 ~0 t2 a ask roads [ set pcolor white ]; z4 D: K& y( g9 C( A5 w
setup-intersections1 X5 @; f# u. ?+ O5 E
end
% C% f* }: b+ B9 i$ U其中定义道路的句子,如下所示,是什么意思啊?5 F( ]: i7 D# Y! m- Q% V) d4 z
set roads patches with' i: M7 f) Y+ S3 g$ I* B
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
8 u* g) d8 Y; h) Q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
0 n9 @* i( k6 u+ l9 [" w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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