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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。& m* m7 H/ s, M8 u4 S+ [- m
netlogo自带的social science--traffic grid这一例子当中,; [0 I. k2 C" t( _( F
globals9 m* B6 c/ K7 @4 j* X7 g/ J( n1 B
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9 G8 L! Y" q" U8 E( t1 B grid-x-inc ;; the amount of patches in between two roads in the x direction
3 f2 z7 `! n( q3 e- Z& ~8 F grid-y-inc ;; the amount of patches in between two roads in the y direction
9 F- v; e! @' g$ i acceleration ;; the constant that controls how much a car speeds up or slows down by if
1 \. I9 N# o) W: p3 F: ` ;; it is to accelerate or decelerate$ Q1 {$ d8 {4 ^" i3 W; G! Z
phase ;; keeps track of the phase x/ Q, w" A" Y4 v5 u ]
num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
& C) ]. @$ B: s8 c7 W8 M* u current-light ;; the currently selected light' Y% p+ @% K1 K8 P& L& P
6 c% p, }2 R8 P4 a6 {2 ]
;; patch agentsets6 U; z2 j2 g ]
intersections ;; agentset containing the patches that are intersections
- i, a0 i8 J7 x$ ^0 `( k% B roads ;; agentset containing the patches that are roads
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! ]% n, {6 O8 kturtles-own
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* q9 q; p8 E* \! ^4 l- U% ]; a+ D* z speed ;; the speed of the turtle7 P7 l2 [/ z; `+ T% ~
up-car? ;; true if the turtle moves downwards and false if it moves to the right' p _2 l" W; X2 T! x: [
wait-time ;; the amount of time since the last time a turtle has moved
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patches-own
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intersection? ;; true if the patch is at the intersection of two roads2 G) Y @6 f6 V% B8 h! g
green-light-up? ;; true if the green light is above the intersection. otherwise, false.
' `3 ]- t! n4 g/ ~ ;; false for a non-intersection patches.
3 L; q( ~2 a$ T my-row ;; the row of the intersection counting from the upper left corner of the* g1 |( V) K( F0 }! I1 T# ^
;; world. -1 for non-intersection patches.1 x9 q; d4 o3 v3 T
my-column ;; the column of the intersection counting from the upper left corner of the8 S! U/ w& Z z; s
;; world. -1 for non-intersection patches./ Q$ G% \3 u2 o
my-phase ;; the phase for the intersection. -1 for non-intersection patches.0 o. s+ `; W# ]2 z
auto? ;; whether or not this intersection will switch automatically.
. q' ?& F6 E" p& ?' L# h; \ `; P ;; false for non-intersection patches.
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- L) e7 T2 p! s: ^! P! d V;;;;;;;;;;;;;;;;;;;;;;; o5 U. O, V# K* M+ O
;; Setup Procedures ;;# t' V# x6 U, u4 F( P: D
;;;;;;;;;;;;;;;;;;;;;;7 g# q6 h; W1 u, Z6 n/ y+ t, Z
( |' b4 ~9 N9 f;; Initialize the display by giving the global and patch variables initial values.: [6 l; L& k" @3 l, G: {: F! |
;; Create num-cars of turtles if there are enough road patches for one turtle to
6 z3 O% Y+ q' v+ h; ^;; be created per road patch. Set up the plots.
- d' _* {3 j- D, v" W; l$ uto setup) `# z; p* x! B {; }; M1 Z
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setup-globals
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' |/ j/ Y# _, Q; J2 V ;; First we ask the patches to draw themselves and set up a few variables
' z: U- Q# y8 f) N. a setup-patches
8 O% K) L; x+ G9 ~: L6 N make-current one-of intersections. Y2 R! Z" o& u4 _: `
label-current
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set-default-shape turtles "car"0 ~, r N7 I9 _5 V2 q$ F' |
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if (num-cars > count roads)
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$ U% q ]' G) Y user-message (word "There are too many cars for the amount of "
. I; @: |% n7 d" b6 y" b" k l "road. Either increase the amount of roads "
' @+ S. r9 H8 E' V$ ?5 s r "by increasing the GRID-SIZE-X or "
; a+ Y/ b1 C3 n! R( K. H& v "GRID-SIZE-Y sliders, or decrease the "
9 i- l8 P5 D: q$ y0 {- D& H "number of cars by lowering the NUMBER slider.\n"
! a6 z$ w m- n l- T "The setup has stopped.")
& R( C0 V6 Y2 I* D' a stop
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7 T. T8 B C1 k& r' u9 ], Z" b ;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
: [0 K8 f# p8 A$ m* B" d crt num-cars m; E$ z& ?5 ~8 [7 ?0 N
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setup-cars
& z0 x2 a2 y. O set-car-color
. i9 p8 x/ s1 ~ record-data
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;; give the turtles an initial speed' J2 \5 c3 ^+ ^ w# {
ask turtles [ set-car-speed ]" F4 o( t( V- ^* P" e) H0 K' f
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reset-ticks& A% i$ l% \( i' c p! W5 v1 @
end$ N4 i$ S3 }4 P$ ^3 A; h3 ?0 }
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;; Initialize the global variables to appropriate values% F: W. J2 B) R' u- z- y: d
to setup-globals
+ F+ T# \9 S9 g. p7 K set current-light nobody ;; just for now, since there are no lights yet5 f; ^5 i+ x: ~) m3 p% B2 c8 \0 G- k
set phase 0
( }1 P" [0 z. t5 A. m" _$ i set num-cars-stopped 01 m8 Q" ~+ \$ u* f
set grid-x-inc world-width / grid-size-x) Y9 {6 _% r, ?/ ^0 Z
set grid-y-inc world-height / grid-size-y
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2 i4 P" Y$ _+ K' Z ;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
0 |. b E% z" s) y+ Z7 y set acceleration 0.099
1 s, G. m" e) ?# Dend
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" Y+ H5 }" H6 o9 c;; Make the patches have appropriate colors, set up the roads and intersections agentsets," R4 s; a4 V" W. W. T$ N
;; and initialize the traffic lights to one setting4 i j0 g4 H: k! V+ C+ ~. g) T
to setup-patches
8 ?' g3 Z5 b0 X) V2 z ;; initialize the patch-owned variables and color the patches to a base-color. Z% }4 A% |# ?7 D% X( u
ask patches
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set intersection? false
9 E3 u2 T1 @, `" a3 j# r8 ?/ a set auto? false3 @% m4 N5 S7 T! c$ g8 J9 v' ~4 ~+ Z
set green-light-up? true
" K/ x3 r% |$ P/ d, o* n3 d1 S) A6 \# Y set my-row -11 a- J3 H: ^+ S# X7 A
set my-column -12 q! y5 O3 R2 v2 ]( P# U( m
set my-phase -1! X) a; B' s. F; s& D
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets% i$ \4 b+ M- k
set roads patches with& \1 y/ O6 }% I) P1 ~" G
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or! g V1 s0 B0 w O3 b
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]) ^$ D4 } y1 P, @9 ]/ q
set intersections roads with
& _& N7 x* {6 b0 a [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and1 s2 x5 [7 u$ l" g
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]% V1 K m& I$ {
8 f6 @( R& P. B5 d% R: H ask roads [ set pcolor white ]
* I0 s+ C6 Y2 V3 Q" P" \: v. J, M setup-intersections
9 B: n' @/ e$ A$ t3 O0 E! ]- d* uend! u; x3 T/ i( M' c0 J
其中定义道路的句子,如下所示,是什么意思啊?3 Q* }7 V3 k( U, B9 O, t+ \
set roads patches with
# `7 P" Y- y) |' W0 u [(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or; @% M' e9 x, K/ k) P! {8 {
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]. ~- V& _/ L" t9 C
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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