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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。1 v( y+ L; i0 X
netlogo自带的social science--traffic grid这一例子当中,! m2 B" V: E/ K2 b' C: {9 Z* i
globals, Z6 S. l5 |: D7 k5 G0 h" {0 Y7 p
[
. n1 `# y3 a$ g' o% E$ m$ U grid-x-inc ;; the amount of patches in between two roads in the x direction q4 `4 o# A8 U% ^5 a; x8 V p
grid-y-inc ;; the amount of patches in between two roads in the y direction3 P) Y d g6 ]1 @4 n+ o
acceleration ;; the constant that controls how much a car speeds up or slows down by if e1 O1 v' B4 Q; c# v
;; it is to accelerate or decelerate
: r* c9 p- `& \& i; @9 s6 |: l phase ;; keeps track of the phase5 s, B' s$ ^' [
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
7 `# j+ B) n7 o: c7 \9 r9 ]8 v current-light ;; the currently selected light5 h- n4 {7 F3 u
5 ?: A+ {- ]% u! {6 @! a; @* \/ T* q
;; patch agentsets) F4 Y0 E `) M1 \- h
intersections ;; agentset containing the patches that are intersections
/ n$ }/ d+ I& h8 c roads ;; agentset containing the patches that are roads
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1 L8 m! f: ?' s5 t9 J9 g4 gturtles-own
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% A4 v8 a! P3 y ` speed ;; the speed of the turtle
! G( M2 b! i# `, b# Z, X( G2 k up-car? ;; true if the turtle moves downwards and false if it moves to the right
* Q" \' W5 p; U5 \. W% J wait-time ;; the amount of time since the last time a turtle has moved
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$ U9 U$ [0 w2 r% p5 Q0 |patches-own: J. B+ Z* r- H! I, N7 I" W1 I
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intersection? ;; true if the patch is at the intersection of two roads( L S% o) _0 E" c8 F
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
/ K# ]' J" O; c ;; false for a non-intersection patches.
9 T" V3 u! Z* ]3 z' j' j) y my-row ;; the row of the intersection counting from the upper left corner of the* W4 u8 v5 G1 [: _/ B2 V5 g
;; world. -1 for non-intersection patches.. n7 r1 E8 F, P: K
my-column ;; the column of the intersection counting from the upper left corner of the' S. O5 ?: U) `1 q; C8 _
;; world. -1 for non-intersection patches.
; H, n8 W5 J3 e$ | my-phase ;; the phase for the intersection. -1 for non-intersection patches.
- D. O) F; B, ^6 `4 s0 P/ P$ I+ G auto? ;; whether or not this intersection will switch automatically.
. }( t/ X, i9 P* h* j6 U' @0 G" m3 J; v ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
, J l Y! r. J# Y" m;; Setup Procedures ;;
( K) A Z2 f8 Q" o/ L- [& B, \;;;;;;;;;;;;;;;;;;;;;;0 J4 n: g4 g& z' C1 f6 p" Q
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;; Initialize the display by giving the global and patch variables initial values.1 R# p5 e/ Y, n4 j" d7 G8 \
;; Create num-cars of turtles if there are enough road patches for one turtle to! ?9 Y% o: O7 k" p- H/ B8 H7 ?. l
;; be created per road patch. Set up the plots.3 {8 t/ W* C w
to setup
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' r5 B* u! _/ `. d setup-globals
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2 S2 c2 P) m* C4 L& T ;; First we ask the patches to draw themselves and set up a few variables
9 ]9 z- d8 @. K7 C& V3 h4 ^+ D4 _. X setup-patches, j4 M4 Y7 k C
make-current one-of intersections
- a5 I2 L; l' I; j% z- _ label-current5 f9 I1 P% D4 j6 |
! W( l' j4 Z I; k& ? set-default-shape turtles "car"
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if (num-cars > count roads): g7 Z; K# b/ X5 {
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! v& W# X/ r z h7 v- S% s user-message (word "There are too many cars for the amount of ") e" ?) \ s; }# n
"road. Either increase the amount of roads ". c2 t4 C8 w( s( ^
"by increasing the GRID-SIZE-X or "- |4 A9 `. j4 V
"GRID-SIZE-Y sliders, or decrease the "
0 h' }/ z4 O- v* i) j$ E "number of cars by lowering the NUMBER slider.\n". M/ W8 ?1 [. ~; V! G6 i
"The setup has stopped.")( a$ `! v6 T, _: u' \
stop/ ^1 q/ l. \9 v
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1 h" V6 G, N" X# \2 n. f ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
3 b3 @" j9 X5 Q: T* M; ` crt num-cars4 h' R# z/ V3 {
[
' p. |" ?6 }- o% U setup-cars7 Q) Q! _9 ?! }0 x* v; n4 w+ S
set-car-color% P# E: w. v ] h: k; g8 n
record-data
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;; give the turtles an initial speed" [+ n. J+ m' X7 K
ask turtles [ set-car-speed ]
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reset-ticks
2 U0 ~ ^8 e* u: Aend
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;; Initialize the global variables to appropriate values9 `# @6 k5 v. N& h+ I1 P
to setup-globals7 e# v" d& n# b& Y3 i+ W
set current-light nobody ;; just for now, since there are no lights yet$ ?+ ~6 k+ |. u! D( B
set phase 08 G a& i1 }7 L5 X0 b: o) n
set num-cars-stopped 0
# Q1 s/ o& N3 j$ P$ y2 n7 S set grid-x-inc world-width / grid-size-x
3 Y2 L5 r- W; q$ c4 Y: ~ set grid-y-inc world-height / grid-size-y2 Y' [% S7 _$ H( m+ C) o B0 c* o
0 r+ Q" ?8 i. P% M ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary( i P6 h+ B0 V) m! I5 {7 ^ @
set acceleration 0.099
- \ k n8 ^2 q, ~# V. Oend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,% {1 u7 |$ [3 E/ I" }9 _. S/ K
;; and initialize the traffic lights to one setting
! {# @- ~# F* X3 G, A3 Nto setup-patches, k k, h' v* }9 u1 k$ f6 ~
;; initialize the patch-owned variables and color the patches to a base-color% F6 W8 u4 \- [) i8 }
ask patches% d: L5 `7 y5 I
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, T) l, ~) r) ]" ] set intersection? false
" t( r1 \% [6 z6 `4 t6 N/ j set auto? false
/ J6 {, z1 | q3 i# P set green-light-up? true
; V; @& v2 e1 W4 t+ a2 Y set my-row -1
5 h3 c% v3 `; o8 U8 z8 c' { H& v- _ set my-column -1+ y% L1 C9 a% n7 S
set my-phase -1+ Q4 \& I {' s3 _4 l" l
set pcolor brown + 3, e4 d% ^' Q B/ S0 ~8 [5 w
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8 O6 B* P* o+ B' o ;; initialize the global variables that hold patch agentsets
7 a' Y$ Q! w4 ]# b set roads patches with
9 B/ R4 V/ ?# S3 R y' U! D [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or& y+ I( I6 H* \" W$ v# c5 f% v# c. r
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]- U! w7 Q5 @ t3 E3 j
set intersections roads with
! _$ u2 n. x' }* ]. w [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and- m( `1 a4 h- Y' o% P! r8 Q7 p# D
(floor((pycor + max-pycor) mod grid-y-inc) = 0)] x% @, Y0 i8 J$ f- R9 J0 g
. f$ D S+ H) U) M; Z ask roads [ set pcolor white ]
5 N% L; O/ ^1 \3 f; R+ L7 r/ c setup-intersections' a9 @% ], `4 S, J
end
( |8 T3 `- U+ k$ r k# A其中定义道路的句子,如下所示,是什么意思啊?
( O' u8 h3 h- T* T5 b+ c" V set roads patches with7 r2 `9 E% k1 s' ^: X' c; `
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or6 u6 g$ t0 ^( L2 |/ ?% j& e
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]4 j0 j- e0 Z r6 s* u2 n0 Z
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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