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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。
( x* E( `: f: Y0 W! X/ b5 ?9 ynetlogo自带的social science--traffic grid这一例子当中,
, ]0 x9 ^* j( c' Yglobals- n6 e8 U8 C q8 ~$ i
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5 ~% u+ r0 j( a+ J, c5 U; O grid-x-inc ;; the amount of patches in between two roads in the x direction
& f0 J7 ]: b0 I- Z) y4 j grid-y-inc ;; the amount of patches in between two roads in the y direction3 c* \& G. Z" S C& D
acceleration ;; the constant that controls how much a car speeds up or slows down by if
4 G" b1 o* P2 q6 @" s/ x8 n ;; it is to accelerate or decelerate
. w! m' N7 ~ {6 q- v$ x _/ H phase ;; keeps track of the phase
l" R2 q# T$ H; J$ d num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure4 {0 T% l- |9 I3 d4 M! T# _: g
current-light ;; the currently selected light% w+ q! Y7 p2 ~
; l7 `1 U# t# o+ D4 a2 ~2 C ;; patch agentsets# p* \, C2 R F; B5 |3 H
intersections ;; agentset containing the patches that are intersections+ c- d9 s' i" p( G0 I) O& v
roads ;; agentset containing the patches that are roads
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7 j* Y; i |4 e; Kturtles-own
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1 p7 F1 O( m, e speed ;; the speed of the turtle
$ F( i G1 O' g0 u+ S$ @: S( S up-car? ;; true if the turtle moves downwards and false if it moves to the right
6 `: B6 M( @' X% x8 \5 a. \& Y5 i4 B wait-time ;; the amount of time since the last time a turtle has moved
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9 X1 D% M, I0 d5 ~6 G a% zpatches-own6 K8 j, N1 x; z# C9 F
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" p) x. q/ K5 {$ Q' E2 E1 o' c: J/ G intersection? ;; true if the patch is at the intersection of two roads
; i* I# H: G/ e9 P4 d9 ^ green-light-up? ;; true if the green light is above the intersection. otherwise, false.9 b! ]& Y- ?2 [. w/ s3 u5 B2 b
;; false for a non-intersection patches.# U$ b/ L: {, u5 M4 z5 `! d1 Y
my-row ;; the row of the intersection counting from the upper left corner of the
, q# h2 S2 \6 G' P9 E3 h, D: S# ] ;; world. -1 for non-intersection patches.9 W; C. i4 ~% ]% v6 {; Z* i$ X/ B
my-column ;; the column of the intersection counting from the upper left corner of the
9 k+ u0 {$ v$ c, `3 V ;; world. -1 for non-intersection patches.
! A9 z! z9 U7 g6 W my-phase ;; the phase for the intersection. -1 for non-intersection patches.
% w' P! Y! l \- Q- ?7 h* `. B8 t auto? ;; whether or not this intersection will switch automatically.
& o. O- k+ k$ x/ J' y' A! ^ ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;4 d# Q6 f5 ?; o$ I
;; Setup Procedures ;;4 M) h5 a7 e8 o- m4 Q( G. e. G
;;;;;;;;;;;;;;;;;;;;;;" m% l" `. f8 ~! e6 o4 N3 o
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;; Initialize the display by giving the global and patch variables initial values.
6 y- L, M: K! X) X. h( i;; Create num-cars of turtles if there are enough road patches for one turtle to3 R* f7 v' e6 H) R/ t3 |
;; be created per road patch. Set up the plots.
^, J% M0 S$ B v) {: qto setup
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setup-globals1 c2 N% \3 H y, p
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;; First we ask the patches to draw themselves and set up a few variables
& A, Q$ e' L7 e- i' a; U: K" C. O' W/ ] setup-patches
+ U- D( |1 R, @/ M. i- q. | make-current one-of intersections
8 F/ x) K ~4 @" I$ l label-current
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}) C( m0 I6 r3 K$ ?) x set-default-shape turtles "car"
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if (num-cars > count roads)" ~ m9 X5 _$ P( ?9 O& A+ s
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, Z: I+ P* u0 J: J user-message (word "There are too many cars for the amount of "
9 C; D/ r% y" p, J0 Q+ l% q "road. Either increase the amount of roads "2 X7 [8 V1 j! q. m) O6 V8 S2 Y
"by increasing the GRID-SIZE-X or "- S* ?% d& }2 l3 i
"GRID-SIZE-Y sliders, or decrease the "
- T& r% g4 d6 `( @ ] "number of cars by lowering the NUMBER slider.\n"
$ U& z1 c- e. u' o0 S5 z6 _ "The setup has stopped.") X& F6 O, i2 i! \# x1 M) A6 U
stop7 m5 s! Z0 W* \! b0 g2 _, |- V
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' [) O* M. \3 d5 k, R: l ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
2 _3 G: b( n; R* a crt num-cars
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setup-cars
9 p. X& \! v- [. k9 w2 Q8 z set-car-color
$ x U; X4 C: ^; Q record-data& J; q' Y2 Y4 D9 d6 U, M
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;; give the turtles an initial speed8 \& b9 M# J2 h x; @' N5 U
ask turtles [ set-car-speed ]! E+ }8 w! Y1 ~; F8 ]* ~
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reset-ticks
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4 D& L* T! S0 y- e;; Initialize the global variables to appropriate values
$ n8 c q3 h9 E1 H: Uto setup-globals) s& Q1 c) ?# {$ M% }+ F, D) O* C, s
set current-light nobody ;; just for now, since there are no lights yet
( O g* q# e: a4 b set phase 0
+ \# v6 z& D2 G' C. ` set num-cars-stopped 0, b. @1 f0 k. Z' k1 r/ `
set grid-x-inc world-width / grid-size-x5 u, w _9 k% _
set grid-y-inc world-height / grid-size-y
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9 L0 W4 g/ m3 Z ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
) h8 i; n' y4 d set acceleration 0.0999 S4 b9 H7 L; p
end- U4 p% D: `5 W
( t; M0 ]/ U& s1 R5 ];; Make the patches have appropriate colors, set up the roads and intersections agentsets,/ G$ U- B. s# s2 {
;; and initialize the traffic lights to one setting
9 u' a( E( Y$ m1 Uto setup-patches
% g) C- H; f) c$ \ _ ;; initialize the patch-owned variables and color the patches to a base-color
0 I a( K9 t; X- y# B ask patches0 E2 {8 W6 u- w) {5 W8 X# O
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set intersection? false4 s1 X% ^' Y4 k2 D# c& Y
set auto? false
% m- s% B7 j; d( t9 h' q$ H set green-light-up? true1 F: L( N5 F g) ]5 y
set my-row -11 x$ K3 ?; ^5 s7 K
set my-column -1
( P0 v! ?3 K4 f S- @5 C4 Y" l0 Z set my-phase -1
6 ]9 c i* p& K( b set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
" a9 y5 `9 v& C$ _ set roads patches with
. q9 k0 {6 J2 y6 q [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or' C/ \/ d+ q7 u3 V) C( t4 p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" ~9 }( K. t$ [- ~9 Q% s) I1 J* [& A2 r set intersections roads with4 |3 w! a+ Z$ V! g1 @ B- m
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
! s) l5 m' A6 T2 M/ Y* F7 F (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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* \8 ]9 h2 `* m) a( q4 C1 ~ ask roads [ set pcolor white ]
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其中定义道路的句子,如下所示,是什么意思啊?
0 ^7 x# q+ n9 Q3 s* R! n3 B$ Y set roads patches with
; o" g( o4 y0 ?7 j$ F7 U. u2 S [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
. I* {! `3 o5 b7 z2 e5 F" J (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
- V! w7 C l# e/ |% i( n4 h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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