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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。
* @/ G( x/ T# i8 c5 v( O# d& Znetlogo自带的social science--traffic grid这一例子当中,( d" f7 _0 c4 J" J
globals
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grid-x-inc ;; the amount of patches in between two roads in the x direction% m6 N; T, }8 ~
grid-y-inc ;; the amount of patches in between two roads in the y direction
2 P( M) ]' S5 s- h acceleration ;; the constant that controls how much a car speeds up or slows down by if
3 S' S+ l& m' {: ?9 B; @ ;; it is to accelerate or decelerate S* D. @. N+ z5 q& }7 J" f, v
phase ;; keeps track of the phase' ?( k# p/ H4 l+ v
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
% V2 ~4 S/ L' E9 K current-light ;; the currently selected light7 |' s; D, v' ~$ U" \* L
$ S6 }- n3 `8 }8 N ;; patch agentsets5 Q! ^# @) q4 q/ A6 v0 i% {. x
intersections ;; agentset containing the patches that are intersections
s) e: l* a$ P0 E/ v+ H! h roads ;; agentset containing the patches that are roads
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3 |" L, d3 A2 I$ F3 Y% t/ G# L W7 f: Rturtles-own( {* [) P7 u Q1 O7 s3 p' K
[
0 `* H" `8 `" X+ O0 h; J speed ;; the speed of the turtle/ S/ \+ N2 X) c/ ~% B: y* m4 S
up-car? ;; true if the turtle moves downwards and false if it moves to the right
3 F2 f# I0 Q; v# y3 I! O- b: A wait-time ;; the amount of time since the last time a turtle has moved
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patches-own0 G: M/ w1 e" v {
[
! A* {& q0 F4 t4 B intersection? ;; true if the patch is at the intersection of two roads
4 e2 D* ^9 d: ~6 v green-light-up? ;; true if the green light is above the intersection. otherwise, false.3 J4 {! r7 q# Z+ n6 {9 a5 K6 s
;; false for a non-intersection patches.2 B1 `/ Y5 Y$ S
my-row ;; the row of the intersection counting from the upper left corner of the
5 @; q4 P, }2 j1 s ;; world. -1 for non-intersection patches.2 j$ v1 l& K; g8 O- ^/ ?
my-column ;; the column of the intersection counting from the upper left corner of the! ?6 ^$ G0 j' t9 M& p
;; world. -1 for non-intersection patches.
9 k/ ]+ J% m, A8 F1 M, A my-phase ;; the phase for the intersection. -1 for non-intersection patches./ ~. v8 e5 s( ^1 l" o
auto? ;; whether or not this intersection will switch automatically.& ~4 Z7 X% L; \% [ [" d
;; false for non-intersection patches.* j5 L2 m$ d7 G
]
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! p9 `0 f/ u) j7 q2 I, {& u+ {;;;;;;;;;;;;;;;;;;;;;;
$ o# ]( e" b+ Q4 P2 u;; Setup Procedures ;;% w2 k4 W& x/ I% W! n& Z2 @
;;;;;;;;;;;;;;;;;;;;;;2 q6 d2 q( n5 q8 w( _6 d! L9 l, V
; G4 K% w( H& l; A4 v, r' W;; Initialize the display by giving the global and patch variables initial values.
8 w7 x4 S, o4 V2 G/ P+ [% P' l;; Create num-cars of turtles if there are enough road patches for one turtle to
, w( S9 f% q* n, a% \" ]9 T) P;; be created per road patch. Set up the plots.
7 O$ r0 i0 k5 P' u! wto setup" B+ A8 G# z; j; F' f2 T
ca
# A1 a3 |, j; a0 ]2 T setup-globals" I; B; E' J' ~& r l; r$ ?
: y6 h( T/ A) W o5 p ;; First we ask the patches to draw themselves and set up a few variables1 t1 k, A7 i. w6 e
setup-patches
& q/ [ A% [3 O+ e/ G make-current one-of intersections
9 C! W# M$ {4 g3 C7 l: A label-current5 W' Q0 S3 Y x+ Y1 h' Q
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set-default-shape turtles "car"6 s( b' B6 s8 L& w) M) X$ Q0 I2 X* \
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if (num-cars > count roads)0 y7 _! m% N/ A* H, _
[
' I7 ^$ H+ Q( r8 v* r; Y3 H5 ? user-message (word "There are too many cars for the amount of ") D+ F0 C0 r1 K; V+ K
"road. Either increase the amount of roads "8 p2 |4 ]9 }1 W' s
"by increasing the GRID-SIZE-X or "
5 W4 E7 m# x* r2 c+ E+ H "GRID-SIZE-Y sliders, or decrease the ": ~6 L# _/ f' Q: P. \* _
"number of cars by lowering the NUMBER slider.\n"+ c( e @+ R/ r
"The setup has stopped.")' j: w& m% E* H' H- t: s
stop
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! Q; S9 t. a# X4 x: s- V4 u ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
( P" b9 B* z0 e/ A' _# } crt num-cars8 d) u8 g. i/ H7 c2 o
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setup-cars4 I! w5 E" F3 v" B/ |
set-car-color) ~8 Q9 s$ g* a) a
record-data3 m" Y4 \# y }" }, W' |- {
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;; give the turtles an initial speed: }6 j* |8 C1 L$ X
ask turtles [ set-car-speed ]; q0 Z+ n! B4 K8 o6 N
; L' x4 p: Y: |7 z l reset-ticks1 @; j- Z% V# y$ }
end% L* U4 q% r/ a/ W. h" T" H( p0 W! N
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;; Initialize the global variables to appropriate values
+ e7 F: `2 v: l2 zto setup-globals8 P+ N& K3 \" d' ?8 d! F# O
set current-light nobody ;; just for now, since there are no lights yet3 ?' V- @; i, u( H
set phase 0 ?( f2 h/ S" k
set num-cars-stopped 0
2 a; Z4 ^0 R6 s* |7 O% ^ set grid-x-inc world-width / grid-size-x
2 m- f# v2 \% O/ u- b set grid-y-inc world-height / grid-size-y- @$ A- M" z' F( Q6 p" Q
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
& [9 ^0 z1 U5 i* { set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,
/ D. W0 ~, O$ O: q;; and initialize the traffic lights to one setting" y) J& k; Y, A2 `" O" q3 T, g
to setup-patches
& o) K7 U: ]$ U% f ;; initialize the patch-owned variables and color the patches to a base-color
* C* ~. B7 V) [( w6 S ask patches
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set intersection? false8 X0 ], x5 o; [3 g( G
set auto? false8 O0 z. `: f! j) h
set green-light-up? true
- X j/ q5 C* y/ Q set my-row -1
$ m7 s) P! i. q( w5 _7 M+ D5 s set my-column -1* c/ j% v0 U, Q% j7 z% [- x
set my-phase -1
0 S3 q: A7 V$ J3 @( I$ y set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
( P# X6 B2 W+ I set roads patches with
- u+ `4 C. e! Z' E [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 m, Q& M8 `& ^% e* F7 J
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
" p: l8 J- }1 M$ \ set intersections roads with. m; L; e% d! |# H* }
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and, x: A1 ^7 T' }6 A) Z9 ^, p
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
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ask roads [ set pcolor white ]
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2 {, l9 t' E4 s+ iend
* c; M% h) D% Y6 Q5 Q7 i+ _( _其中定义道路的句子,如下所示,是什么意思啊?; k7 P6 m9 |, b/ v
set roads patches with8 C2 P( L9 H; ^: z) U1 p
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
) ]+ Z' S# }* [+ A6 A" y (floor((pycor + max-pycor) mod grid-y-inc) = 0)]& `$ @) R& }/ 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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