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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。- c) A# @4 w# G5 E$ _$ A# R' N
netlogo自带的social science--traffic grid这一例子当中,' |; Z# J, H3 k; s P& b0 D
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction3 j( ~) Y) g9 i
grid-y-inc ;; the amount of patches in between two roads in the y direction
$ j0 y7 h) [/ x' l2 [8 k* s acceleration ;; the constant that controls how much a car speeds up or slows down by if* Q7 s+ T* j8 {- `/ A$ I5 j) s
;; it is to accelerate or decelerate
; d' H. J8 Z2 F; u phase ;; keeps track of the phase
% P1 e$ m5 z* s6 J+ y1 v( _ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure, K* G1 E! J/ ], h% E7 h
current-light ;; the currently selected light
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7 T& ]6 n1 J4 [" p8 [ ;; patch agentsets1 ?& z; S6 X/ B6 R5 S7 z
intersections ;; agentset containing the patches that are intersections" F% h: D2 K% y9 S' W1 p
roads ;; agentset containing the patches that are roads) y% F1 x% G* S( _+ B9 d
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/ @( \& W( b; n' m1 d3 b4 Iturtles-own
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speed ;; the speed of the turtle2 M0 E1 l: a+ l# ?; n
up-car? ;; true if the turtle moves downwards and false if it moves to the right
1 ~$ t( l U6 b0 t" f wait-time ;; the amount of time since the last time a turtle has moved
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patches-own! v C, [1 T" ]
[
+ ]: N2 z( r9 { intersection? ;; true if the patch is at the intersection of two roads
- d; m" w0 l4 e4 r5 { green-light-up? ;; true if the green light is above the intersection. otherwise, false.& ]/ h+ G# W6 }, Z ]- O
;; false for a non-intersection patches.
8 y' s9 t4 ^% j/ J+ x5 z8 B my-row ;; the row of the intersection counting from the upper left corner of the! q( Y2 G; w. ^( [' `. a
;; world. -1 for non-intersection patches.
, ^5 z* y' y V6 j# ~5 B my-column ;; the column of the intersection counting from the upper left corner of the4 E: W, r' i6 O
;; world. -1 for non-intersection patches., s) Q3 ^: h( D& u! L' ^( Y
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
* U: \3 X0 y8 V. [6 a auto? ;; whether or not this intersection will switch automatically.
: B8 E B4 N9 e' D$ b. I- J$ [ ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
0 K. p: p8 F, J% i$ C;; Setup Procedures ;;! Z( R- f7 a7 j9 U, z( q5 {' i7 m
;;;;;;;;;;;;;;;;;;;;;;
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" g' F6 n9 T1 {;; Initialize the display by giving the global and patch variables initial values.
+ G, A! T7 q! j6 `% U;; Create num-cars of turtles if there are enough road patches for one turtle to
' `. N c/ |' V* ^4 F6 L;; be created per road patch. Set up the plots.
% A8 _8 a! _, Q# @; L1 }) @to setup
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setup-globals
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" `2 K9 p& o; _6 E+ u3 y ;; First we ask the patches to draw themselves and set up a few variables P) M% X$ ^) L1 J. e( i+ D
setup-patches
) h. q# H3 g* V6 o make-current one-of intersections
1 n$ ?" ?5 K5 r8 x8 A, }- t9 y label-current9 f' K! T$ [4 N: L: h
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set-default-shape turtles "car"
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if (num-cars > count roads)2 Q4 K- @* ^8 ^+ d K! G
[
5 I" E0 J8 _7 A" D, e- g' W2 ^' s user-message (word "There are too many cars for the amount of "" R8 ?/ v2 i- |% ?
"road. Either increase the amount of roads "5 ?: Z3 X& d2 [& l1 k5 Y
"by increasing the GRID-SIZE-X or "' K! i- s- Z( q' W
"GRID-SIZE-Y sliders, or decrease the "
- p; g3 V3 M& ? "number of cars by lowering the NUMBER slider.\n"3 u/ ^( }! C3 w0 g2 p1 s
"The setup has stopped.")2 \* e; V( `# G4 T8 N# t
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color. Y+ S- H9 g0 ^6 Q% e
crt num-cars. b/ _. X' v+ v4 U' U: E- r7 r
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setup-cars
3 N( s z, e& X6 N6 Z set-car-color4 r; P+ G2 O9 r+ v# B* B: \
record-data
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; @3 b5 k H' f9 j! | ;; give the turtles an initial speed
, Y* `2 Y6 B! O* f |) x! z9 }2 H ask turtles [ set-car-speed ]7 x0 t1 g% v. T0 b2 e- I
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reset-ticks8 h4 a o' V' O# h F% x3 @/ A
end- D9 L2 w: t: ] ~: J
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;; Initialize the global variables to appropriate values) G }- A9 E0 B2 r7 @
to setup-globals
, y+ I. Q* E2 `$ S/ u3 U1 G& c set current-light nobody ;; just for now, since there are no lights yet
7 e' j& Z2 T- w! z set phase 0
5 N- r% o5 J* G+ F- A$ b" D+ { set num-cars-stopped 0% c: {, I J- @0 a5 v
set grid-x-inc world-width / grid-size-x
5 p0 P4 }& L1 D5 }$ T set grid-y-inc world-height / grid-size-y
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9 R0 Z' l- t( }, Z/ U4 ?& M. P. ~% y ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
/ h2 O4 s7 b0 C3 X9 g set acceleration 0.099. n; H6 v# d( i3 K) F' \; M: P2 h
end8 f' d1 Z. A. r% z8 c
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
# ~: t, k4 |6 G( V, _1 I; f;; and initialize the traffic lights to one setting' _% c r6 _5 T/ B: \& @- q/ N
to setup-patches$ b) q; F0 Q# B8 z2 M
;; initialize the patch-owned variables and color the patches to a base-color; o! T" z( H6 H5 B1 Y" b1 c$ ^. ]
ask patches) f6 r$ w5 J9 B {0 Z4 {
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set intersection? false
/ R* z: b6 \+ c, D& Q set auto? false; y% b5 B+ w) q7 s
set green-light-up? true
' H( s6 N- `8 W: C, y. j. J set my-row -1+ X) n6 x6 O F0 j9 i$ @
set my-column -1
^! m$ G6 k/ t2 Y, O set my-phase -1
3 p6 Q s% x6 q7 {6 x8 m5 | set pcolor brown + 3
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8 U4 N r% X# U) W! c m3 t ;; initialize the global variables that hold patch agentsets9 @% B; @2 z J" w
set roads patches with/ B$ k: `: G- O0 L
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
! m" D# U2 v4 q (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( {8 H3 z4 C) ?9 x$ U
set intersections roads with
3 A# R5 C a, \4 x8 z [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and: N+ R6 C: r6 M# i
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]: T j9 K- D7 u' G: Y7 b
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ask roads [ set pcolor white ]4 k6 _& u9 x* G
setup-intersections6 Q) V' o* D+ Y# A4 K' Y* i7 w
end
* Y3 Z% b/ G4 b! u/ ^% p1 D* f% x- g其中定义道路的句子,如下所示,是什么意思啊?
+ b5 n, K. C( u% L: \% F set roads patches with0 i J/ K$ u5 S7 P' o+ C, X
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or. H* R* U8 @$ p9 G" s+ f( I
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 p/ ]& K7 n) y9 P) M( q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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