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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。
; i+ G9 \, A" m' T9 k mnetlogo自带的social science--traffic grid这一例子当中,
7 K* B6 K# M k l8 b' j8 bglobals1 G2 e, q% X! W- g; }, u, q
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7 ^6 h w2 z" Q, Y4 F grid-x-inc ;; the amount of patches in between two roads in the x direction
( z6 U% Z; U H2 j, N' }- a grid-y-inc ;; the amount of patches in between two roads in the y direction
* w! {8 k T0 P, P3 K; w acceleration ;; the constant that controls how much a car speeds up or slows down by if7 T/ o M/ _) R# w
;; it is to accelerate or decelerate" u3 ]4 g1 r1 i; ^6 i" V4 O2 \: S
phase ;; keeps track of the phase
* T6 W8 Z1 U) [; d1 e num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
% c$ o/ j8 r& _. ~, o h current-light ;; the currently selected light9 n0 d2 @! w: E0 Y4 r
5 X( u7 j3 h) C5 O* f M ;; patch agentsets4 H* u. ~5 _6 e" E
intersections ;; agentset containing the patches that are intersections/ _" E- I w0 u" i6 z
roads ;; agentset containing the patches that are roads5 {# q2 D2 o" M- ?6 Z& ]
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" }4 t3 c2 o/ o( i' S( Q$ `turtles-own; R5 _5 W- F' r4 U7 }
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/ |+ b* k$ w4 u# d" ^ speed ;; the speed of the turtle
" x% ^/ `* @- W% k up-car? ;; true if the turtle moves downwards and false if it moves to the right
' D- s+ m9 ^6 c% c) Q0 Q6 O wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads0 e' x5 ~5 J: ? X; h K
green-light-up? ;; true if the green light is above the intersection. otherwise, false.! l" J+ S9 F1 O/ R6 r {
;; false for a non-intersection patches.8 L3 e- ?( Z4 C" p) ?; r4 J u: ~1 o
my-row ;; the row of the intersection counting from the upper left corner of the
" ?* A* G- x! m& F ;; world. -1 for non-intersection patches.* m6 ^4 ^' H Y% \7 U
my-column ;; the column of the intersection counting from the upper left corner of the
2 f& r, P. _+ C+ Y8 v$ y% B0 r) T4 z ;; world. -1 for non-intersection patches.
; `. s& ~+ y _% E( H- x4 \ my-phase ;; the phase for the intersection. -1 for non-intersection patches.
! l2 ~4 I$ Y e0 k auto? ;; whether or not this intersection will switch automatically./ J& r& @# x2 \# p; a% s9 N! D
;; false for non-intersection patches.+ z1 y; [# N2 \
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8 ^ K; b" R, q, y;;;;;;;;;;;;;;;;;;;;;;
8 c; K! Y9 R K( J5 U6 g" A7 c, y;; Setup Procedures ;;
9 i8 m Z' H, O+ f" `;;;;;;;;;;;;;;;;;;;;;;* p( B0 a3 [. t; t/ A: u
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;; Initialize the display by giving the global and patch variables initial values.0 N" [; i! O+ i9 s* B0 Z
;; Create num-cars of turtles if there are enough road patches for one turtle to
6 w8 d1 Y9 ~5 P, [;; be created per road patch. Set up the plots.8 \5 _! Q2 X% A& c t& K: ?) I
to setup
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- D' Y8 M; R; u9 R setup-globals# o$ d; w) j: w; o6 n& Z
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;; First we ask the patches to draw themselves and set up a few variables) |9 o& I- C# V: E! I7 z
setup-patches: {2 @! r8 {, a6 v0 n
make-current one-of intersections
- b9 p3 a; m* U; X label-current4 y7 T4 \( W5 A- |' @- V0 ~
, [% A* `7 R y- Z8 x set-default-shape turtles "car": B: s" I r7 s r
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if (num-cars > count roads)% Q7 q/ V& n0 p
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" _- X3 S. K0 U' _% b( T% E9 S3 e; s0 ] user-message (word "There are too many cars for the amount of "
8 o9 ~6 [' ? P "road. Either increase the amount of roads "' E8 ?- } k$ O9 v8 Z ~0 v
"by increasing the GRID-SIZE-X or "- D9 \+ l' O( x( b& I: Z
"GRID-SIZE-Y sliders, or decrease the "
0 i2 V2 c. v3 L- t* ?0 x "number of cars by lowering the NUMBER slider.\n"
* s; {" g6 P1 I "The setup has stopped.")
, m/ z# U5 b' @+ Q& Y$ a stop
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% n) B; f, t1 b- c' R' ^ ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color6 G$ q9 Z$ z" `! Y" e& g. |
crt num-cars
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G. q' d$ d g/ G9 r1 q setup-cars
" p) E3 j2 Z$ b Z; I7 R# s J6 O set-car-color, [& T/ R/ H- \8 G( k
record-data/ G+ s6 ^/ Q/ o4 o& S
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& ]/ e$ `. K) n" M1 B ;; give the turtles an initial speed1 K. y. k& W$ O$ @4 T
ask turtles [ set-car-speed ]; G" ]; u/ N% E
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reset-ticks
) {" x) O. |% ]. A4 mend
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, h: O+ B& p: F4 A+ A;; Initialize the global variables to appropriate values
3 ^* a y# ^9 ^3 _& u, R3 [7 tto setup-globals5 k. A) b2 h* ]# n
set current-light nobody ;; just for now, since there are no lights yet1 f; A( [5 S9 W, b3 S& ~" W
set phase 04 M% A/ m, p( ]4 B. _+ p
set num-cars-stopped 0% v) n8 E& C! J
set grid-x-inc world-width / grid-size-x
- l3 h j* \6 y. Z% j set grid-y-inc world-height / grid-size-y
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) `; M/ W! C/ B P ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
( k* i3 u& _: w8 o3 B set acceleration 0.099- ~2 ]# a$ K& b
end
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" k* B6 y7 E: ]. V: ?5 \;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
' L6 C% \6 g' u$ };; and initialize the traffic lights to one setting# G0 [& D, @$ m5 N! N
to setup-patches
( x' \, ]: s, t4 p. X- D, j ;; initialize the patch-owned variables and color the patches to a base-color
7 {: Z; v" p4 I3 ?4 A ask patches9 V# ?: g. a/ c) Y
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set intersection? false
8 D7 S5 Y2 P$ @- \5 G# V/ h set auto? false. _2 j. f8 ^4 k! |' w* y8 g I7 B! A
set green-light-up? true% _! Q! f! y% W& ?1 O+ n
set my-row -12 S' V: W9 q! C
set my-column -1
4 [; B2 _- K& U" I \ set my-phase -1
, F; E* d6 ~$ a" K' E set pcolor brown + 3
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2 w. j9 T L C: d" a; M; k ;; initialize the global variables that hold patch agentsets% ]- ^/ W* q% f# m# O
set roads patches with! {- [! L# p* v. a
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or/ E( }" I: V) B" t( H7 x
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
U! h" \, K9 D5 Y3 T4 K$ Z set intersections roads with
* T0 F" D8 L3 N2 c6 K8 s, ?. Y [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 t2 X9 p( D2 u& D# G (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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* u" q' @4 a3 }6 R: Z( e9 L ask roads [ set pcolor white ]
% p M8 z! C3 K8 u( L9 | setup-intersections
7 k8 j2 h- d& U/ a; pend
8 M: I; L( F- Z其中定义道路的句子,如下所示,是什么意思啊?
' s/ p$ y* \/ o+ S set roads patches with/ l, k4 m. z% k' D) n1 L" l* ?! {
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
3 @; v- Y4 r5 E- `- D5 [4 w (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( u" X7 C4 T9 v0 v
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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