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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。
# Q% \* |. h3 q: Y5 cnetlogo自带的social science--traffic grid这一例子当中,: H) x9 D& W0 C+ p. ~$ P) {
globals
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, B* z: z z( K( e" ] grid-x-inc ;; the amount of patches in between two roads in the x direction
& G) R; U0 {/ B! W4 `2 t8 x( F grid-y-inc ;; the amount of patches in between two roads in the y direction; L5 m+ `* L+ X7 G0 i" A
acceleration ;; the constant that controls how much a car speeds up or slows down by if; ~( g/ ^& y; X( i. {
;; it is to accelerate or decelerate
( ^" O$ I4 n6 c. X2 k2 L phase ;; keeps track of the phase- U; C2 R8 D" ~; W9 J m
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure3 s! v# z6 r3 p# I0 A; U
current-light ;; the currently selected light& f7 n7 x. m Z+ b
* c! }1 ^# c9 s7 k, S ;; patch agentsets
+ k# E1 `0 ^8 y intersections ;; agentset containing the patches that are intersections
( w6 k1 _% K# ` roads ;; agentset containing the patches that are roads
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turtles-own
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speed ;; the speed of the turtle
( Z& R/ M8 J+ {* z) `) O. W up-car? ;; true if the turtle moves downwards and false if it moves to the right
0 G5 {+ N( P$ G# p' \# T0 Z wait-time ;; the amount of time since the last time a turtle has moved
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% w" d( Y6 j! p7 M |patches-own
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intersection? ;; true if the patch is at the intersection of two roads$ w" p0 m8 @% J Y+ @* t
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
2 I/ r) I% J* M0 |4 W ;; false for a non-intersection patches.
/ K4 I3 h+ T$ T$ X) }! i my-row ;; the row of the intersection counting from the upper left corner of the
6 R: A, Q7 t( i) L ;; world. -1 for non-intersection patches.
1 F" X2 Z1 r7 W2 F- R my-column ;; the column of the intersection counting from the upper left corner of the/ [1 N; G1 T/ N8 v
;; world. -1 for non-intersection patches.
& k8 Z8 C5 l9 |- e my-phase ;; the phase for the intersection. -1 for non-intersection patches.
& q, P' R* b. L+ q5 O u auto? ;; whether or not this intersection will switch automatically.
5 T8 O" `2 g; C8 y% K% Y. ?( e ;; false for non-intersection patches.2 G( d% L9 h. B
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' _% r) ]9 S6 H0 h/ ~/ T;;;;;;;;;;;;;;;;;;;;;;
?+ R+ N* p' m# N; R n4 I;; Setup Procedures ;;
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;; Initialize the display by giving the global and patch variables initial values.
. f% f. W7 o) P W/ a1 `) };; Create num-cars of turtles if there are enough road patches for one turtle to
/ B* w# ?$ Q# g/ T% G% j# j& x;; be created per road patch. Set up the plots.% L3 `0 s0 j. ]8 w; X+ D
to setup5 C0 j9 w( L) } K, J1 x; i: Y
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setup-globals8 |& Z/ B/ {+ J7 K* U4 e/ [0 s
0 D& u4 W: d# r, p% a ;; First we ask the patches to draw themselves and set up a few variables
2 L# s2 l( T- d; a7 v, {* e setup-patches* g0 _7 x/ r) c* H
make-current one-of intersections
; S7 z6 D' s9 R! p! _* l. r. V* u6 O label-current
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set-default-shape turtles "car"
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" q; k- a( u& H* b2 S* I+ ^# J if (num-cars > count roads)# c; ~/ g6 }! K; S9 i
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user-message (word "There are too many cars for the amount of "
& a" P0 W. E8 N# h0 r* a) o "road. Either increase the amount of roads "
9 S, y5 k6 w" s% `/ {/ q, Q) m; H" B' l "by increasing the GRID-SIZE-X or ": J+ }% u; F4 O
"GRID-SIZE-Y sliders, or decrease the "
0 G; t+ B0 b! f @ "number of cars by lowering the NUMBER slider.\n": Z+ d7 U- M+ Q: n; Q, t1 ?
"The setup has stopped.")# i# |% F* {+ q' j
stop5 g2 S1 Y9 |* G& [: w0 ]4 e
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color" @# a6 S H( Z+ j& w8 P# Y" G
crt num-cars( j& i3 L* Z: O' i5 U: c/ \& s
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setup-cars
8 K* Q' `# U3 o$ {1 f* u" G a: ~ set-car-color6 | g/ ~6 H$ [1 y
record-data4 Z: s! b5 Z5 o v+ h# Z" U
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;; give the turtles an initial speed
' ~4 A" z3 O( L( t, e2 F3 v, F. ] ask turtles [ set-car-speed ]2 p8 S$ D& Q* a7 x; I a& Q! U' k
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reset-ticks- M* ~$ E1 P, O, o( r
end
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;; Initialize the global variables to appropriate values
; d F! ^$ @& L: ?$ gto setup-globals
- ?( }: {+ {8 I5 d; z set current-light nobody ;; just for now, since there are no lights yet
- K+ n1 L" D# F$ s& s set phase 0( X7 P$ N2 t, S- n
set num-cars-stopped 0! O4 Z8 P" r* q4 \; Y( T# A2 _
set grid-x-inc world-width / grid-size-x
1 Y$ o- O0 x+ g7 R Z, G set grid-y-inc world-height / grid-size-y b: W& l" v1 f! O# x
9 E7 }( e' v8 J# v! \* t4 F9 n. j ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary2 Q4 L+ L* M6 ]% ]4 g; R. Y6 y* k
set acceleration 0.099
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; @) u7 ?5 u/ q# |8 j; q: a;; Make the patches have appropriate colors, set up the roads and intersections agentsets,4 \: p' ]) z4 i# ?8 B! R) p! K; x; w6 {$ h
;; and initialize the traffic lights to one setting( T( Q/ ]; P" ]( v9 c: k2 O
to setup-patches
! L) j ~: R8 `! J& j ;; initialize the patch-owned variables and color the patches to a base-color+ C* e9 h& K Q4 h/ x
ask patches
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' {& L" |8 W% P; i& `2 C Z- v- i set intersection? false
5 |8 j8 M: V% b8 N" T set auto? false* X8 }5 o% Z* F/ V) {6 c
set green-light-up? true% l4 }# s1 Y$ Y1 m5 N1 j4 G7 m
set my-row -1
6 P) `- i. h' O/ C/ J3 p set my-column -1
. q6 I3 a9 C9 Y7 r. H ]7 { set my-phase -1
0 q! F6 G1 T3 h, c" B# _. B$ H+ W0 r set pcolor brown + 3
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7 x6 p0 P/ W9 Q( {$ j0 R$ ~ ;; initialize the global variables that hold patch agentsets7 I1 y7 \* A! ]: h6 t
set roads patches with
1 d3 |5 p, K' W- q$ @ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
6 D, b; z1 U6 N% _) E! R (floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ Y4 m& }( K& }. m& [
set intersections roads with/ i" s$ I& N* O, G& P
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
/ j( t4 r- e' `2 {4 ?' s' f& ]2 M (floor((pycor + max-pycor) mod grid-y-inc) = 0)]' \9 j( t9 M& p+ s/ y( y/ T
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ask roads [ set pcolor white ]
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- m: r9 e# v+ s7 `# _2 Hend
+ c5 `) B2 f. c其中定义道路的句子,如下所示,是什么意思啊?) z2 Y7 C/ u$ G
set roads patches with& C) |6 C7 p1 R1 y, U
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
|# q, e9 j7 _8 r2 E (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
, a8 t% d6 l" q- V( Y5 c2 B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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