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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。
; H, K" D0 X+ q1 {3 hnetlogo自带的social science--traffic grid这一例子当中,
! v0 h2 z! v$ k3 }, dglobals! X9 V% k$ O2 z& P5 G; e. w
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grid-x-inc ;; the amount of patches in between two roads in the x direction
' S, v' T2 W6 |' ^6 k. a$ O7 {( I grid-y-inc ;; the amount of patches in between two roads in the y direction& P2 a% d7 Y. u$ D X
acceleration ;; the constant that controls how much a car speeds up or slows down by if
# N/ C! ], T" _ ;; it is to accelerate or decelerate
7 l" D5 H& Z: S" H7 \3 R: k- k0 t phase ;; keeps track of the phase4 k% _* f6 X- s. g% v# D
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
: R: v1 ^. E! ^4 p7 @ current-light ;; the currently selected light& Q9 h5 u" M: ^2 T' t
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;; patch agentsets" K& s/ I4 c4 r, C! f M2 C3 M
intersections ;; agentset containing the patches that are intersections I' U. A4 k* r! B7 q' w, R: P) Y4 D
roads ;; agentset containing the patches that are roads4 l& a8 T" {! y7 ]1 @; { J+ a5 [
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turtles-own# b+ W" o. I2 L/ T ]% `( B) e
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speed ;; the speed of the turtle
1 D, p* e7 K6 o* p8 ?5 { up-car? ;; true if the turtle moves downwards and false if it moves to the right
: f) G" {) ]7 [2 q wait-time ;; the amount of time since the last time a turtle has moved6 d) h# }; V; _3 j4 t
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( S+ s4 [2 _7 y; ^- j; P1 ypatches-own! w; j& L; W6 P% ?* T
[
- A2 D% d6 _$ S0 U intersection? ;; true if the patch is at the intersection of two roads2 E: j! V- w$ U# p4 H3 s. H
green-light-up? ;; true if the green light is above the intersection. otherwise, false." U& }) Y$ `4 \$ P# s# @+ ~
;; false for a non-intersection patches.: y U. _- S: _$ G+ S$ \
my-row ;; the row of the intersection counting from the upper left corner of the
6 ]5 v3 F/ r1 n& \ ;; world. -1 for non-intersection patches.& E1 }5 { p3 F* a
my-column ;; the column of the intersection counting from the upper left corner of the, D- g7 e# M2 o! m& {, ]
;; world. -1 for non-intersection patches.# f4 r7 S, e& y) c7 [6 m4 R8 s9 s+ J
my-phase ;; the phase for the intersection. -1 for non-intersection patches.
/ l6 g* Q& R/ W) f% A6 K auto? ;; whether or not this intersection will switch automatically. d0 x8 d# O. u3 {' e ~3 G! ^
;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
4 G2 a% `: b& S; J% J;; Setup Procedures ;;
4 j. D- ?# a0 ~3 J;;;;;;;;;;;;;;;;;;;;;;
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" D% {1 l/ N( `" v) f# _;; Initialize the display by giving the global and patch variables initial values.8 a# M* `) d% ^( ?0 x/ F9 f
;; Create num-cars of turtles if there are enough road patches for one turtle to0 M9 c$ j2 j% m
;; be created per road patch. Set up the plots.# t/ N/ k4 D: C: w) |6 z
to setup
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& ?3 n% o S' w setup-globals
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;; First we ask the patches to draw themselves and set up a few variables% p' N7 ?2 ]. H d4 x
setup-patches( q$ ^: \ }8 I. i+ T0 r
make-current one-of intersections
0 Y4 u; z7 [8 c8 I% {" N" N7 s- } label-current
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set-default-shape turtles "car"
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7 w: k- }% k$ N: {% w1 v8 b- J! x if (num-cars > count roads)( u* P6 y6 R7 T# Z% Z( H
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user-message (word "There are too many cars for the amount of "
. S4 U4 e1 f1 @ B Y "road. Either increase the amount of roads "
( j& k6 A x9 u( N J* a3 v "by increasing the GRID-SIZE-X or "( p8 R7 w( i6 t, J9 c9 }
"GRID-SIZE-Y sliders, or decrease the "
, G2 O& U* Q, \1 \6 b- y "number of cars by lowering the NUMBER slider.\n") q/ | K2 t, D' N3 E: @, u
"The setup has stopped.")
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$ [9 ` n! {: |; |- F) L7 @9 K ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color/ j8 l7 `3 j+ _4 \, S
crt num-cars
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; i# I( G8 [2 `- T3 j setup-cars! ?3 c6 U& ]' c- o0 ?
set-car-color
7 G `2 V" b4 Y# w* g record-data
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8 u) G; ~# _- q5 ` ;; give the turtles an initial speed
8 M% w- J4 Y1 v8 n, f, s$ a- H ask turtles [ set-car-speed ]! Z* K8 w2 h1 ?/ y* o
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reset-ticks! g# ]" E' N9 K8 A f
end9 D) [' S0 e- Q+ Q2 [
8 c5 d% o# N4 M2 O7 i* n, M% D) Z;; Initialize the global variables to appropriate values3 E- {# a6 x9 s$ }
to setup-globals) C) f7 J% W% e
set current-light nobody ;; just for now, since there are no lights yet& q K" b' [6 x8 |/ i
set phase 0
5 [" K( [: h6 A' O2 i& N* H) |9 k9 { set num-cars-stopped 0$ A* ^3 I. h3 z, p+ R- y
set grid-x-inc world-width / grid-size-x
6 I* B, @4 [7 g- ` set grid-y-inc world-height / grid-size-y
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& w, @( L3 g3 y% { ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
7 q7 G9 V, R0 H5 S/ d set acceleration 0.099
L) h- L6 s4 {; Eend
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! p% l2 N. Q1 p+ ^0 O. _5 E) E;; Make the patches have appropriate colors, set up the roads and intersections agentsets,2 Z$ f/ C2 H# B+ |' N0 B/ w# { x
;; and initialize the traffic lights to one setting1 T* z$ {7 U n! M2 Q2 `$ C5 a m1 z
to setup-patches6 a1 E: e# j/ O9 M) l% V: S4 F1 z7 E
;; initialize the patch-owned variables and color the patches to a base-color: v6 o9 M, p$ G
ask patches
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6 Y: R2 z$ V' g/ e1 J set intersection? false" E, ^- t( F- \. |, U+ \
set auto? false7 M3 R# u! ^4 E% X( `1 z: Y1 B
set green-light-up? true" r1 c1 M/ @, k5 _8 X" t0 l
set my-row -1 ^$ X1 l9 a/ s6 l, P
set my-column -19 ~" U1 A4 q. [: C: }+ `9 a% C
set my-phase -1* E" h7 M# Z/ \5 N' ~6 C
set pcolor brown + 3. r9 v! ]0 U8 v" q: Z5 `: S( S; ]
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! v2 A, n# _4 ~ ;; initialize the global variables that hold patch agentsets
0 ^% T9 \7 H7 i; V) M4 { set roads patches with
' t$ ?# F" i( W [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or3 L8 h! T- x' Y3 r: ^5 f. x) p0 _6 \
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* \3 R( z) @& R* K% ?4 v
set intersections roads with! t5 {5 l- G6 [4 _8 L
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
4 B1 O d' |: h) Y5 f6 {+ }1 g, M (floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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7 o/ ?, T$ S. Q( j! { ask roads [ set pcolor white ]# z2 a- l% l( I& V
setup-intersections
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其中定义道路的句子,如下所示,是什么意思啊?; B: i' I; g. X, j8 Q2 @
set roads patches with9 V$ j# n! H. l2 N
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or% O# e5 C" g0 M# B' t& N$ Z
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]+ C" ~7 J# y [
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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