| 查看: 312 | 回复: 1 | |||
| 当前主题已经存档。 | |||
lovein金虫 (小有名气)
|
[交流]
【求助】麻烦帮忙看下一个“随机游走”的程序，为什么运行时老出错！！！
|
||
|
整个程序如下： (*----------------------------------------------------------------------*) BeginPackage["RW2D`"] RW2D::usage = "RW2D[maxstep, ktry, range, startarea, datadirectory] reads the two - dimensional digital image file (text file) and exports the mean - square displacement of random walkers as a text file, 'msdlist2d.out'. 'maxstep' is the final value of the time step of the random walker. 'ktry' is the number of average (i.e., number of walkers). 'range' is the lower and upper limit of the voxel intensity of the pore space. 'startarea' is the dimension of a square as the percentage to the system size. The random walker starts to diffuse from inside the square which is located at the center of the image. 'datadirectory' is the directory or folder name where a single two-dimensional digital image file (text file) is located. " ShowTrajectory::usage = "ShowTrajectory[kk] is for the graphic display of the random walk trajectory of the 'kk' - th trial. " Begin["`Private`"] (* Reading the two - dimensional data in 'datadirectory' *) readdata2d[range_List, datadirectory_] := Module[{dataname, datasize, x, m2d, rmin = range[[1]], rmax = \ range[[2]]}, dataname = First[FileNames["*", {datadirectory}]]; datasize = Round[Sqrt[Length[ReadList[ToString[dataname], Real]]]]; m2d = Partition[ Map[If[rmin (* random walk *) (* 'xylist' is the trajectory of 'maxstep' - step from 'o2d' *) tra2d[maxstep_, o2d_List, m2d_List] := Module[{n2d = {{1, 0}, {-1, 0}, {0, 1}, {0, -1}}, now = o2d, xylist = {o2d}, outoffield = 0, xmax = ymax = Length[m2d], step, new, x, y}, ran2d := Random[Integer, {1, 4}]; For[i = 1, i (* random walk of 'ktry' - walkers *) (* 'tra2dktry' is list of the trajectory of 'ktry' - walkers *) rw2d[maxstep_, ktry_, startarea_, m2d_List] := Module[{xdatasize = ydatasize = Length[m2d], xylist, outoffield, tra2dktry = {}, failure = 0}, rano2d[lx_, ly_, sa_] := {Random[Integer, {(1 - sa/100)/2 lx, (1 + sa/100)/2lx}], Random[Integer, {(1 - sa/100)/2 ly, (1 + sa/100)/2ly}]}; o2d := (For[i = 1; {x0, y0} = rano2d[xdatasize, ydatasize, startarea], m2d[[x0, y0]] != 0, i++, {x0, y0} = rano2d[xdatasize, ydatasize, startarea]]; {x0, y0}); Do[{xylist, outoffield} = tra2d[maxstep, o2d, m2d]; AppendTo[tra2dktry, xylist]; AddTo[failure, outoffield], {i, 1, \ ktry}]; Return[{tra2dktry, failure}]; ]; (* calculation of the mean - square displacement *) msd2d[data_List] := Module[{ktry = Dimensions[data][[1]], maxstep = Dimensions[data][[2]] - \ 1, d1, d2, d3, dd, ii}, d1 = Transpose[data, {2, 1}]; d2 = Map[(# - First[d1]) &, d1]; d3 = Transpose[Map[(#^2) &, d2]]; dd = Apply[Plus, Transpose[Apply[Plus, d3]/ktry]]; ii = Range[0, maxstep]; msdlist2d = Transpose[{ii, dd}]; Return[msdlist2d]; ]; RW2D[maxstep_, ktry_, range_List, startarea_, datadirectory_] := Module[{failure, msdlist2d}, (* reading the two - dimensional data in 'datadirectory' *) m2d = readdata2d[range, datadirectory]; (* execution of the random walk *) {tra2dktry, failure} = rw2d[maxstep, ktry, startarea, m2d]; Print["Failure = ", failure, " / Success = ", ktry]; (* calculation of the mean - square displacement of 'ktry' walkers *) msdlist2d = msd2d[tra2dktry]; (* file output of the mean - square displacement *) (* The file name is 'msdlist2d.out' *) Export["msdlist2d.out", N[msdlist2d], "Table"]; (* graphic output of the mean - square displacement *) ListPlot[msdlist2d, PlotJoined -> True, AxesLabel -> {"time \n step", "mean-square \n displacement"}]; ]; (* graphic output of the trajectory *) (* Show the trajectory of a single walker as an example. *) (* RGBColor[] of 0, 1, 2 are colors of the pore, obstacle, and trajectory, respectively. You can change the color as you like. *) gtra2d[tra2d_List, m2d_List] := Module[{color0 = RGBColor[0.9, 0.9, 0.9], color1 = RGBColor[0.5, 0.5, 0.5], color2 = RGBColor[0.8, 0.8, 0.8], plmin = 1 - 2, plmax = Length[m2d] + 1}, tra2dshift = Map[(# - {0.5, 0.5}) &, tra2d]; tra2dm2d = (aa2 = m2d; Map[(aa2[[#[[1]], #[[2]]]] = 2) &, tra2d]; aa2); Show[ Graphics[ RasterArray[tra2dm2d /. {0 -> color0, 1 -> color1, 2 -> color2}]], Graphics[{Line[Map[Reverse, tra2dshift]], AbsolutePointSize[5.0], Point[Reverse[First[tra2dshift]]], Point[Reverse[Last[tra2dshift]]]}], PlotRange -> {{plmin, plmax}, {plmin, plmax}}, AspectRatio -> 1]; ]; (* Only for the 'kk' - th trial, the trajectory of the random walk is shown graphically *) ShowTrajectory[kk_] := gtra2d[tra2dktry[[kk]], m2d]; End[]; EndPackage[]; (*----------------------------------------------------------------------*) (* example of usage *) (*----------------------------------------------------------------------*) (* As noted below, first of all, you put the command '<< RW2D.m'. *) (* Then you can put the command set, 'RW2D[500, 200, {0, 34000}, 10, "DATAsingle"];' and 'ShowTrajectory[2];'. \ *) (* 'RW2D[maxstep, ktry, range, startarea, datadirectory]' is the command for the performance of the random walk and the calculation of mean - square displacement. *) (* The command 'ShowTrajectory[kk]' is for the graphic display of the trajectory of the 'kk' - th trial. *) (* In the example below, a trajectory of the second trial will be shown graphically. *) (* In[1] := << RW2D.m *) (* In[2] := RW2D[500, 200, {0, 34000}, 10, "DATAsingle"]; ShowTrajectory[2]; \ *) 不知道为啥，运行的时候老是出错，我又看不大懂这程序，请求帮忙 [ Last edited by lovein on 2009-10-26 at 13:35 ] |
回复此楼» 猜你喜欢
40+中年人失业后，还能找到好工作吗？
已经有13人回复
-
用NBS溴化时溶剂除了CCl4外还有什么
已经有6人回复
-
申请科研项目纯靠实力能成功吗？
已经有11人回复
-
极限拉扯，如何抉择
已经有15人回复
-
二审4个多月了还是Awaiting Reviewer Scores
已经有4人回复
-
OpenAI又攻克数学难题了，离AI做有机合成还有多远？
已经有13人回复
-
课题组会帮你通过考核么？
已经有7人回复
-
售一区SCI文章T0P，我:8O.551.O54,科目全,可十急
已经有9人回复
-
售SCI一区文章，我:8O5.5.1.O5.4,科目全,可伽急
已经有10人回复
-
售SCI一区T0P文章，我:8.O55.1.O.54,科目全,可十急
已经有8人回复
lovein
金虫 (小有名气)
- 应助: 1 (幼儿园)
- 金币: 1419.6
- 散金: 4
- 红花: 1
- 帖子: 254
- 在线: 38.3小时
- 虫号: 534931
- 注册: 2008-03-28
- 性别: MM
- 专业: 其他无机非金属材料
2楼2009-10-26 13:39:16
200