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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。- R8 T: x1 I( `- V
netlogo自带的social science--traffic grid这一例子当中, z) p& M6 L: M4 j1 B V0 P8 O' u
globals2 U: c' P4 H) `; r
[
& _% f' W* \ a" u d. @ grid-x-inc ;; the amount of patches in between two roads in the x direction6 A2 V$ O6 m/ }& e/ m7 Q4 Z
grid-y-inc ;; the amount of patches in between two roads in the y direction
# M2 Q; I! R; G1 l acceleration ;; the constant that controls how much a car speeds up or slows down by if
. f& y, l, k+ R1 c ;; it is to accelerate or decelerate( ~0 M& v' h$ r# d3 U
phase ;; keeps track of the phase
5 p& j' t8 l2 H1 @$ r% ^2 X" \ num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
1 Y1 q" D6 \- T. S current-light ;; the currently selected light, v& l# {/ @- o! M- u( O
& I, ~! L! [4 C$ U ;; patch agentsets
" ~$ e* A: ~* h intersections ;; agentset containing the patches that are intersections
! @# D. a' ]4 @4 M. E; R" {- ]# p- _ roads ;; agentset containing the patches that are roads* u6 G; x+ ]# [ I! q4 o
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turtles-own
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; |# M" k1 q& U G% s. w speed ;; the speed of the turtle& p! C# T3 v8 E/ i* o; ~' |9 n6 h
up-car? ;; true if the turtle moves downwards and false if it moves to the right, q: |5 {+ w9 [/ L! N7 B6 S7 V" X
wait-time ;; the amount of time since the last time a turtle has moved) k& `. z7 V7 l8 \
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, m* F' l" i( q! K; O0 Ypatches-own
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intersection? ;; true if the patch is at the intersection of two roads6 D/ u% Q" a! e, ^
green-light-up? ;; true if the green light is above the intersection. otherwise, false.. i2 {1 I0 \( ? o5 ?5 T* H# p
;; false for a non-intersection patches.
: s6 `3 c4 ]$ a2 C my-row ;; the row of the intersection counting from the upper left corner of the% A2 G: P6 |, i2 p- d* Q& U
;; world. -1 for non-intersection patches.
+ t$ j. n' c- h) u5 |( @( p: b my-column ;; the column of the intersection counting from the upper left corner of the/ d; ?: _5 J3 U; r1 J7 ^; ~! a1 J
;; world. -1 for non-intersection patches.- A) e8 u3 V6 E: {5 E a
my-phase ;; the phase for the intersection. -1 for non-intersection patches.% T) |' c9 S/ M
auto? ;; whether or not this intersection will switch automatically.1 U; a+ G/ F4 s; c# I
;; false for non-intersection patches.- h5 Y4 L$ r! I! `
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;;;;;;;;;;;;;;;;;;;;;;$ [- |3 x& l6 y1 K8 J
;; Setup Procedures ;;
6 w, `0 w- ?) R; E; ?;;;;;;;;;;;;;;;;;;;;;;7 j* a# M$ Q0 b. C. o: B) T
; a. ~* q- I' u( @8 G7 z: V& n;; Initialize the display by giving the global and patch variables initial values.. \) t* E, A0 t3 H
;; Create num-cars of turtles if there are enough road patches for one turtle to
/ W9 k" p# y" ?6 r;; be created per road patch. Set up the plots.
L& @1 r4 U- R3 {; @: z: xto setup
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setup-globals
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;; First we ask the patches to draw themselves and set up a few variables9 G) o1 g: A% C
setup-patches1 Q. R4 G& i u1 ]# T" k
make-current one-of intersections
0 U* x& D' J1 i. K; |$ L label-current4 j7 |7 y4 j j8 y B* e9 u
* g Z! W; ? ` set-default-shape turtles "car"
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2 B& Y* ?; e$ J" j' \6 M# T; R if (num-cars > count roads)* |4 V: G! h. {1 n2 u
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* V; F( [+ c% }/ g user-message (word "There are too many cars for the amount of "3 R5 D5 D2 E" f9 u9 Z+ V
"road. Either increase the amount of roads "
" R$ B) N' y! A) x+ M "by increasing the GRID-SIZE-X or "
' |- m" }& `# L" L "GRID-SIZE-Y sliders, or decrease the "
+ j9 w1 ?. t8 a6 }/ A5 c& {1 M "number of cars by lowering the NUMBER slider.\n"
) ?7 q) Y8 `/ _- E "The setup has stopped.")
! l) I7 B0 V9 Y# F stop* R# x' [, f+ Z" ^3 t5 E5 M* a
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
1 O( A$ { T# g$ u5 ` crt num-cars. C6 p8 g( Q- |; U( E) z
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setup-cars9 m! z! ?! O F; v' @
set-car-color
( s- Q6 Q; i3 q record-data1 {9 \ @" b& w- G2 G
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! `' o- s! G" i! p ;; give the turtles an initial speed. Y3 Q$ x6 A/ E4 s1 ]
ask turtles [ set-car-speed ]
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reset-ticks
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;; Initialize the global variables to appropriate values# Y a/ F+ l9 e- l, W* Q' G- |
to setup-globals7 h0 m; O3 p/ e9 c" l; d' O
set current-light nobody ;; just for now, since there are no lights yet
; r5 @# @2 ]4 E set phase 0# G( Y0 M- f: _" K; j& u
set num-cars-stopped 0
1 R) a+ A- T+ u; B& y4 ~ set grid-x-inc world-width / grid-size-x
( j# P! E$ p" I; I3 i+ q' } set grid-y-inc world-height / grid-size-y h _7 S' @% ~/ V, S
3 B* r# Y+ R: H W2 o! L ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
. D0 Q; g, o6 H set acceleration 0.099. l( y( E- A- G( e1 W |+ B
end
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3 T; K! S" K) s4 X' I: n;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
9 T% E) v+ i7 z) j9 q: F) B;; and initialize the traffic lights to one setting, B1 F1 N0 h9 Z7 t m. c- A: d* f! Q
to setup-patches. s5 Z2 M9 _: j& I2 V% E
;; initialize the patch-owned variables and color the patches to a base-color
1 o, ?5 }7 a& i ask patches% ?2 z C/ L/ P* s: B
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% L+ m ^' c* G6 Z* l set intersection? false( ~4 i5 h. ?( I0 [! D
set auto? false T* Q& R+ P: N. `6 v
set green-light-up? true4 E4 c) O8 o- u: e1 |; I
set my-row -1" [# E7 L" V5 b3 I7 @
set my-column -1# r) O- l3 L/ V, r" j2 _, Q9 x
set my-phase -1
* c- i6 m3 m' l' r K6 r set pcolor brown + 3
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. |; d/ t1 {9 d( M+ q( m: v9 S ;; initialize the global variables that hold patch agentsets* Z2 j$ z A5 w" _0 P
set roads patches with
]/ T; I. \: J+ W' c7 N$ ` [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
; Q% j. w5 f( `5 b( M0 I (floor((pycor + max-pycor) mod grid-y-inc) = 0)]* t' |3 e: e; R
set intersections roads with( D" V7 R7 L+ l; P7 x( H0 I9 _5 S6 a
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and
, J @. T) f0 M3 e1 z (floor((pycor + max-pycor) mod grid-y-inc) = 0)] }; @+ ~7 g& j/ K( R7 y
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ask roads [ set pcolor white ]9 P7 n6 M, H* Y
setup-intersections) A( y; K! q/ J
end
7 e) U; q4 C! S8 V其中定义道路的句子,如下所示,是什么意思啊?
8 |7 `. G: m. e9 t" J8 | set roads patches with
5 T- n# C3 {' Z0 q1 O) {4 }/ q( R+ G [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 j3 Y3 J1 @+ h( |. S
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]* w3 Y& W W" \* Q6 O2 _
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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