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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。
0 `1 x7 y4 Q2 o, a9 R) Qnetlogo自带的social science--traffic grid这一例子当中,0 u$ }) Y0 Z: Q6 U4 J! b, ]
globals- k) p/ [# g$ N$ U0 z% h& J! A
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K* v% i# |$ j( J2 f/ u% h grid-x-inc ;; the amount of patches in between two roads in the x direction- v9 d" r T3 C$ L( F, N0 r
grid-y-inc ;; the amount of patches in between two roads in the y direction- r) n) C$ D- R' ?
acceleration ;; the constant that controls how much a car speeds up or slows down by if/ L! T3 c( Y# e/ k
;; it is to accelerate or decelerate
" d* D7 ?+ D3 y1 M2 H$ }, n phase ;; keeps track of the phase
4 T3 t5 K1 B- ]. d6 c0 h9 P num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure* r9 @% E! j }+ g& _2 Z+ p% Z! J' q' l
current-light ;; the currently selected light
* v6 N. B) h" @" E4 ?1 B1 S; D/ a, f1 Z0 e- m! ]8 K
;; patch agentsets* U5 P' P7 I8 u) o8 M
intersections ;; agentset containing the patches that are intersections
- v$ X% P( n, K4 A6 G roads ;; agentset containing the patches that are roads
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* }( j3 T* v0 B- [, g- K/ vturtles-own4 N% r5 B* r1 U6 X8 W; e6 Y( a5 b
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speed ;; the speed of the turtle
% g# X0 p+ L. b# f3 i up-car? ;; true if the turtle moves downwards and false if it moves to the right
. }7 i) X8 g1 a: F5 ^ wait-time ;; the amount of time since the last time a turtle has moved1 r }3 D% x. n+ y) o2 [$ r+ x
]: \# a2 a0 L" C/ d
7 ^2 i9 }# l1 U6 W7 |3 qpatches-own2 b3 {4 k4 C7 D: z
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! b& x* `3 y0 G* s3 H* k6 W intersection? ;; true if the patch is at the intersection of two roads
" h) e0 x, l! D) i) P green-light-up? ;; true if the green light is above the intersection. otherwise, false.
) C# b" G$ Y, H ;; false for a non-intersection patches.
. Y ]+ s0 t! p2 X. h; C my-row ;; the row of the intersection counting from the upper left corner of the
# Q+ K0 X9 D& K ;; world. -1 for non-intersection patches.
9 H. D n! ~5 P, ]4 m5 F* S8 | my-column ;; the column of the intersection counting from the upper left corner of the# D; Z& n! i) y' Y, M2 U7 F
;; world. -1 for non-intersection patches. e$ k6 d, }6 q2 b, J6 E' q
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
" m, u5 ]+ d: q' V( S: F auto? ;; whether or not this intersection will switch automatically.
9 G H4 e& h g9 ~ ;; false for non-intersection patches.
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9 L( k/ U" k! A6 H;;;;;;;;;;;;;;;;;;;;;;
* ?$ R# y4 d! y" C8 ] x;; Setup Procedures ;;5 p: h5 x" \2 \( q7 i
;;;;;;;;;;;;;;;;;;;;;;
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2 W0 h4 J* B2 `$ `6 b7 D;; Initialize the display by giving the global and patch variables initial values.
9 h$ ~$ B8 R7 v' Y2 R;; Create num-cars of turtles if there are enough road patches for one turtle to
0 v+ S, T* o' F j9 A6 y7 g;; be created per road patch. Set up the plots.1 g4 y- r \, K; x( P* {
to setup6 {0 r6 [; B9 G; W
ca
. @7 I }6 j6 R+ G6 U$ x. M4 X setup-globals0 `8 |. g9 E5 _7 H
4 W2 I( g9 H7 T ;; First we ask the patches to draw themselves and set up a few variables; v7 D) b$ j% u! e! q
setup-patches/ H; ] n6 s" @, a% K' D0 Z* t
make-current one-of intersections
6 c) k) e* {' g$ |$ N label-current
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1 M! ?$ u- n$ k set-default-shape turtles "car"
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if (num-cars > count roads)
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% [" |# H1 j' ^" z- n ? user-message (word "There are too many cars for the amount of "6 j' L% i$ o! h; A v9 i- ~
"road. Either increase the amount of roads "
2 s* W. j8 ?$ u7 s: C "by increasing the GRID-SIZE-X or "
{4 m9 w0 T; N: o/ ]# O "GRID-SIZE-Y sliders, or decrease the "
9 x0 i4 G; C4 m2 [ @1 ~' E "number of cars by lowering the NUMBER slider.\n"
1 v' W7 C- f8 I6 i1 P$ y "The setup has stopped.")( P: U% b3 }* u H) n9 H
stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color; D0 C% M# ~9 c& Q% {
crt num-cars
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3 [3 F& P; @) a: y setup-cars
( S' l8 V+ _1 s! B! ~/ h set-car-color
" A$ ~5 h; a R8 E1 G record-data
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# H* O* e5 ~, o+ O- `; e ;; give the turtles an initial speed' \1 Q* w7 y# U; J! T
ask turtles [ set-car-speed ] j: v" P# o3 Z& q- P+ L2 D
: ^2 K6 U0 c8 b* l: c reset-ticks5 k) Q8 f6 S. l- W! d# r, G
end
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5 ~" D: F0 u6 c/ Z, x;; Initialize the global variables to appropriate values* P# B6 B3 v4 U* g; @: D
to setup-globals* A8 Q- [1 ]+ Y+ r9 p. P+ T' _
set current-light nobody ;; just for now, since there are no lights yet7 p" N1 @0 M+ k, d, k' N! h: X+ H
set phase 0
; N) ?# C2 ~; y* g o1 [1 B, k e set num-cars-stopped 0
4 m: Z9 n. n! o P set grid-x-inc world-width / grid-size-x
9 C# K+ z9 Y! B8 W set grid-y-inc world-height / grid-size-y, J9 L! k, B& ?4 l9 n. ]2 W
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
+ x' Z3 J0 U# p& ~* \ set acceleration 0.099' o+ X( }7 U" }; [% \
end
$ N5 |! h" ?. H" C3 A) r
. q R& [" Z2 b;; Make the patches have appropriate colors, set up the roads and intersections agentsets,6 [9 j# U- Q! M! l
;; and initialize the traffic lights to one setting& U+ z+ M) M: x* Y2 ]# L
to setup-patches* N& s4 P9 j9 Z) g: E S
;; initialize the patch-owned variables and color the patches to a base-color
2 w/ T9 K v% n0 G* E9 H ask patches2 g7 @; a6 R. F; @% h7 ~0 ~7 D4 X
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& X. n2 V J$ h: [/ ?: S0 h8 D) Q set intersection? false
6 {4 {. K4 p- p- x# c- W set auto? false
( d* _! N8 |% x4 X! K: E. U a set green-light-up? true" E0 h0 L! b" [6 U* h8 i) H
set my-row -1
" {% ~# a9 I! L1 G0 H$ p7 G. q$ R set my-column -1
' T# l" n; ~) T2 K* Z set my-phase -1! q7 _1 N, J4 N; E3 b; J' `
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets9 g8 {/ D6 J6 t3 H( |0 v
set roads patches with
* _8 Q0 G' L2 |: O# P: s [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 j& P* q E4 r4 P* l% @* _! g (floor((pycor + max-pycor) mod grid-y-inc) = 0)]! M7 G8 B& U. a- Z5 Q& F
set intersections roads with7 [( p( {# A/ d+ q$ c- Q* i
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
t9 ?. A% c: h8 r6 v5 n7 ^( [ (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]( I( C" x2 {, P* [* m+ D. _
setup-intersections
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0 Q4 o8 u! v7 ^3 [其中定义道路的句子,如下所示,是什么意思啊?
& Y: D- n/ j# t& a- S0 P set roads patches with4 \. e" b% B5 ^; i+ p: `# S
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 v! b* Z/ {1 |- u4 `/ Z/ n7 g
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
9 T- M, S& H' B C& m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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