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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。
; a) [" @ o$ nnetlogo自带的social science--traffic grid这一例子当中,
V6 ~2 ]9 i+ `( Mglobals, I: O6 e: @% {7 F( G2 w( _) S- P7 i
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% s9 ~! A. v0 A grid-x-inc ;; the amount of patches in between two roads in the x direction
5 N7 q0 P, ?3 a: ^) ?% }$ h5 Z grid-y-inc ;; the amount of patches in between two roads in the y direction
% L+ o& z4 s$ A: K3 u acceleration ;; the constant that controls how much a car speeds up or slows down by if9 B0 f) f" f7 y# _0 q
;; it is to accelerate or decelerate4 A* W2 o/ v/ d$ Y H% z: n! w, q6 \
phase ;; keeps track of the phase) C0 D) f9 X' l% k
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
, L- t. r" Q; Z0 q+ ]% C$ L6 m! O current-light ;; the currently selected light. e# f3 Q' t$ z
3 I: Z; o& m/ X/ C) _, q! J+ j6 V ;; patch agentsets2 Q( S) w7 {% Y" {
intersections ;; agentset containing the patches that are intersections9 n- V5 v6 ^/ v. J: B8 g
roads ;; agentset containing the patches that are roads
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- j* {1 Y, q0 ~9 J. |turtles-own6 z5 W8 Z' a I8 k7 M
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- C7 D. h* r7 b$ [/ i' w speed ;; the speed of the turtle
' p/ P5 V7 S+ j5 z up-car? ;; true if the turtle moves downwards and false if it moves to the right
' W, z# ] g- I wait-time ;; the amount of time since the last time a turtle has moved2 o1 K* f [1 o2 O5 E
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patches-own
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! W: ?1 }2 P* f' U/ z) A intersection? ;; true if the patch is at the intersection of two roads8 z; \3 ?7 x: ]$ V; ^2 A1 X
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
. v# ]9 @$ h- _! k ;; false for a non-intersection patches.
U0 j6 X1 B. h- |( y my-row ;; the row of the intersection counting from the upper left corner of the
5 `) K1 N" s) P, Y ;; world. -1 for non-intersection patches.
( o2 Z P( A2 w8 R my-column ;; the column of the intersection counting from the upper left corner of the, T5 W5 p h9 ^% l2 }. _
;; world. -1 for non-intersection patches.% s- n3 W) O& Y4 m w
my-phase ;; the phase for the intersection. -1 for non-intersection patches.1 }" @6 k0 b! E8 B. F$ @& z" E" G
auto? ;; whether or not this intersection will switch automatically.5 K6 e% j# d) Z Q. l- H
;; false for non-intersection patches.- y, U4 v- V* M* }
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;;;;;;;;;;;;;;;;;;;;;;
& ~+ s, @, Q" @$ P2 `) r. o3 ];; Setup Procedures ;;
! \9 ]1 }* e0 h8 v1 }; H* b;;;;;;;;;;;;;;;;;;;;;;3 Z/ e: O5 U; T+ h1 Q# b3 d
) Z n3 p! P* _+ b2 P+ h;; Initialize the display by giving the global and patch variables initial values." g3 R; ]& W. N: r6 I; A2 \
;; Create num-cars of turtles if there are enough road patches for one turtle to3 G: U9 k" X, d; B) U
;; be created per road patch. Set up the plots.$ f. e# }3 I7 w
to setup
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setup-globals; l- a6 ?! X" i& C
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;; First we ask the patches to draw themselves and set up a few variables
- V8 d( w- S. w. ~0 y8 t5 T setup-patches" l' ^# A8 e3 b, B* \
make-current one-of intersections
: A6 P, h8 k. F$ q2 o- w label-current6 e) `* N& _5 B, y3 Z8 w& e
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set-default-shape turtles "car": W" ?0 W; c" h2 `7 K8 L
5 i) c! A/ R: A$ A if (num-cars > count roads)
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, o) v' H6 V. m" w* W/ r user-message (word "There are too many cars for the amount of "* l$ Q2 k! P' u- e$ y# D2 Z2 Q
"road. Either increase the amount of roads "* E" X6 ^& F! t/ K# N
"by increasing the GRID-SIZE-X or ": V% H+ T$ {- g- P' y3 S4 }
"GRID-SIZE-Y sliders, or decrease the "
, f( o* t5 Y! m+ `$ f. b "number of cars by lowering the NUMBER slider.\n"5 S8 M& S0 I: w. J! p9 j5 w
"The setup has stopped.")
8 J2 d' `8 E; W: J, R stop
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3 ]# i8 P( e ~$ P: R ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color( K9 O0 i. N, t9 l5 ~
crt num-cars/ t6 C' J/ q! r5 \2 H1 l
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setup-cars
6 c$ H/ ~3 B- E set-car-color
4 z* s1 m/ }# p6 P' o* L/ b5 ] record-data
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6 {3 X0 g7 F, q: H' y ;; give the turtles an initial speed( {4 C8 b' i) G7 m$ O
ask turtles [ set-car-speed ]2 \* Z5 B8 O# F
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reset-ticks( }0 N' V% Q) n; `- u" o
end1 p6 S, e$ e' K
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;; Initialize the global variables to appropriate values
! b, m) r+ S/ E( k. t6 Yto setup-globals
# C* D6 P# P9 \! ]6 v; O set current-light nobody ;; just for now, since there are no lights yet) E7 t( Z9 u3 x! Y, {6 Y
set phase 0
% z: q3 u5 q, C9 E" F set num-cars-stopped 0( f5 X3 _4 T# R! Q0 I
set grid-x-inc world-width / grid-size-x1 ^! C' P" N& s) y
set grid-y-inc world-height / grid-size-y2 G6 n" Y9 G% m+ l0 p0 A' a# Y
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary. [1 O6 ^6 X& m0 u0 Z. }1 r0 r
set acceleration 0.099
- v1 R+ u: c5 Eend
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,8 T, S! T3 h7 g6 a3 @+ h/ S
;; and initialize the traffic lights to one setting* z) v# j9 i6 I& |
to setup-patches$ t7 {3 b& _3 B
;; initialize the patch-owned variables and color the patches to a base-color) {1 E/ {; j; w3 Z
ask patches
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set intersection? false
$ D1 O$ Q& M) m1 y i' i! h9 f set auto? false/ ^! |; @+ T! i, V* W3 O8 M/ P( P$ v
set green-light-up? true
8 ]$ R9 F" y+ u, j5 w0 y- G set my-row -11 c, F0 _! l0 V/ _ B' g* M
set my-column -1/ z7 y' B3 d' ?) Q
set my-phase -1
8 n" s4 @8 N9 a9 J3 k7 M/ J set pcolor brown + 3
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/ u8 o8 M4 g* {4 s- t S8 w: u! a2 ~1 C ;; initialize the global variables that hold patch agentsets
1 Z n5 v( r9 O" B, W set roads patches with3 D; `6 n' `/ b8 J, h
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or8 v. v) F7 A" X/ k3 B; E
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
; t2 v( E v0 n5 o set intersections roads with
& {( c5 }- M* d- c4 x' ? u [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and: A$ o! y7 Y, k) T, f+ o
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]2 v8 U- i$ l* p8 i; {
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ask roads [ set pcolor white ]9 ]" ]0 B* r7 e$ ~* B
setup-intersections% g* w2 M! z1 b
end: ~4 g: A. l1 f* }, P
其中定义道路的句子,如下所示,是什么意思啊?- f8 h7 Z% H& l* @7 Y" j7 I+ Q
set roads patches with
5 u& O/ p4 b e: m$ J+ U, _' ^ [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or: X9 _# m# Q4 U8 P0 I
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
5 [0 ~& J$ Z% v) }* s' `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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