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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。
; g4 F, q2 n9 t. C' [netlogo自带的social science--traffic grid这一例子当中,( [% A& q* O! ?& C. g
globals; q, V- {2 @3 Y( K Y. z2 e/ T8 r3 f
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grid-x-inc ;; the amount of patches in between two roads in the x direction% @1 C3 o B2 V+ M5 L6 @+ T) Y! F0 Y/ M
grid-y-inc ;; the amount of patches in between two roads in the y direction) Z9 g: a4 U0 s3 R5 x/ _
acceleration ;; the constant that controls how much a car speeds up or slows down by if
8 S, P$ h2 y+ {$ O6 y9 O& ^; g ;; it is to accelerate or decelerate
, c0 [+ h& }1 _8 M) ?3 g* f4 | phase ;; keeps track of the phase
+ m }$ @! s% W0 `+ l num-cars-stopped ;; the number of cars that are stopped during a single pass thru the go procedure
5 ^* Q4 ~0 K1 q% z, y4 P current-light ;; the currently selected light& ~6 M, s* ?2 e4 m) s. ^2 d
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;; patch agentsets
3 U- V4 L' q1 X8 n* I intersections ;; agentset containing the patches that are intersections
1 x# i5 r3 w% _ roads ;; agentset containing the patches that are roads7 ? X5 d- F) G( k: T, _
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8 b8 F) n" e6 ]7 i; u4 B, N0 oturtles-own0 @7 D N! E% ?: O |/ s5 E
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speed ;; the speed of the turtle% A3 R a9 i% s4 e/ l' A
up-car? ;; true if the turtle moves downwards and false if it moves to the right
) ~- ?- _8 h9 c* M$ H4 C( } wait-time ;; the amount of time since the last time a turtle has moved
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; l+ I% Y: a! B4 h. G* x7 Fpatches-own# }/ S9 B P/ I
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" ~( d% E- k- ` intersection? ;; true if the patch is at the intersection of two roads
; i1 j8 h6 y5 u: K* x5 F green-light-up? ;; true if the green light is above the intersection. otherwise, false./ U' U/ |2 Z+ L8 B& x# D
;; false for a non-intersection patches.8 ^" K( ]" R! ]9 ]/ t7 {
my-row ;; the row of the intersection counting from the upper left corner of the! F- S" m* |' T1 K( q) D
;; world. -1 for non-intersection patches.
' J/ D8 {3 Q* L% | my-column ;; the column of the intersection counting from the upper left corner of the
' l% M# _0 O( x8 `4 m1 z) ? ;; world. -1 for non-intersection patches.
8 K; V7 d+ e# |( R" ]* R" s$ s' w my-phase ;; the phase for the intersection. -1 for non-intersection patches.- n! `% g# I4 ?2 I
auto? ;; whether or not this intersection will switch automatically.
7 m$ k0 t6 H4 L: z3 B2 b6 [ ;; false for non-intersection patches.
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;;;;;;;;;;;;;;;;;;;;;;
" q% _8 A3 L. O8 i2 E;; Setup Procedures ;;6 R y9 M* d- N" T$ H$ q
;;;;;;;;;;;;;;;;;;;;;;
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& V/ O6 X+ y) R6 p+ k6 u5 y;; Initialize the display by giving the global and patch variables initial values.- H/ Z. c. k9 v5 ~, Y" P# g
;; Create num-cars of turtles if there are enough road patches for one turtle to+ O1 A# j0 u1 e E
;; be created per road patch. Set up the plots.- e9 \0 U0 p) d- b* }
to setup
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0 Q3 c/ j) X3 \1 O9 j; ]& u9 f setup-globals
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: T5 b. j/ a8 N2 p1 y5 ^. v) O ;; First we ask the patches to draw themselves and set up a few variables
+ T+ i+ e# I# p# u+ W setup-patches
# W1 G8 g3 I! B0 u6 P make-current one-of intersections
& U0 y: ?; J7 v* Q label-current
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8 F4 y# \; [1 g, Z( r( J set-default-shape turtles "car"
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if (num-cars > count roads)
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user-message (word "There are too many cars for the amount of "! t, N% I- V, \
"road. Either increase the amount of roads "
6 o* b8 y, s1 d2 t* _9 f "by increasing the GRID-SIZE-X or "
6 A, a# Z9 _/ j1 p* b" D5 j; N "GRID-SIZE-Y sliders, or decrease the "' }9 v1 T( T$ n% \$ T/ y5 n1 m
"number of cars by lowering the NUMBER slider.\n"1 e3 R1 |+ C/ N2 \' t8 w( r4 t
"The setup has stopped.")
0 F1 [. {: [) r5 U% n8 F stop
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;; Now create the turtles and have each created turtle call the functions setup-cars and set-car-color
; X2 K; U2 d% E1 I4 j! y crt num-cars
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3 D, {4 m x* A" D+ C2 ? setup-cars
& g' }3 H. l5 W; h, T set-car-color
' C- ]2 m6 U7 l: ]+ w4 @ record-data* m3 ?8 ?2 F8 J( _
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;; give the turtles an initial speed) @6 P5 N4 D$ o* m* u' ]$ u8 a9 b' o
ask turtles [ set-car-speed ]) R1 C: ` X+ I! b2 b; \
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reset-ticks1 c2 w. T* Q! g/ Z; s9 X- e
end
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3 n- {6 X( |, Y" V2 ]8 A. S! I3 c8 E;; Initialize the global variables to appropriate values
3 |# g: M3 M4 b! ]to setup-globals
5 D2 s7 T- U# f4 P1 ^ set current-light nobody ;; just for now, since there are no lights yet
W; c- @6 C1 m7 V2 B* y set phase 0
9 A' V4 E& x3 o# c set num-cars-stopped 01 p# M; l0 w; b# \3 d& \
set grid-x-inc world-width / grid-size-x
( b- \ C) h4 q set grid-y-inc world-height / grid-size-y0 O* {, ~1 [; v9 s" R
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;; don't make acceleration 0.1 since we could get a rounding error and end up on a patch boundary
, z4 f7 u' b: g! P; V set acceleration 0.099
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;; Make the patches have appropriate colors, set up the roads and intersections agentsets,1 W3 o9 v! D7 S2 R) y1 V- X7 ?0 g
;; and initialize the traffic lights to one setting
" k- R, {* a& H; {% Eto setup-patches5 `+ z: ~- z# J, E
;; initialize the patch-owned variables and color the patches to a base-color
' r8 I7 z1 M' S' n0 H8 w3 z ask patches, ]( x$ V3 H$ e; ~- Y: X1 f
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set intersection? false& @6 ]1 ]6 J8 f# I7 j% ~
set auto? false
" Z1 p3 b1 h7 E2 J8 v set green-light-up? true
# }: k2 r- P4 [8 ^1 f; e# d$ C0 J set my-row -1
. E' d' c! J7 H" K+ ^' R set my-column -1" z# c! N' g; \3 b* |
set my-phase -15 N- x# s. S E. C: V* e
set pcolor brown + 3
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;; initialize the global variables that hold patch agentsets
1 O s: A' [& h. g7 s set roads patches with5 k ~: l1 ~5 K1 b5 `* p: o
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or0 @, r7 F) z3 R
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]
/ ?, r, { K, P4 U) @ set intersections roads with9 @5 B2 |2 q1 [) \6 v! a* n a7 p7 O
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) and# i; { A! Q0 e9 E1 r
(floor((pycor + max-pycor) mod grid-y-inc) = 0)]: [8 G) T" K$ A& E3 P
& {$ m2 w; m1 ^ ask roads [ set pcolor white ]3 s0 V8 i0 V& Z! K. ?
setup-intersections
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6 ~0 k1 c4 X' F! T2 O0 r! m其中定义道路的句子,如下所示,是什么意思啊? C2 Z6 S" E; E; c5 c, o w: w2 J
set roads patches with4 k) W; I" w' D! R: H! [
[(floor((pxcor + max-pxcor - floor(grid-x-inc - 1)) mod grid-x-inc) = 0) or
% f5 t- u) J/ J5 m/ v6 I6 u (floor((pycor + max-pycor) mod grid-y-inc) = 0)]( A/ n' k6 `+ N% m/ F9 f
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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