Question

我正在尝试使用NetLogo lpsolve扩展进行线性编程。

从下面的代码中可以看到： -该扩展通过提供变量数来工作（在这种情况下为2） -成本符号写为[coeff.x1 coeff.x2右侧符号]，其中符号编码为1、2或3。 -最大化或最小化的函数是[coeff.x1 coeff.x2]

比方说，我想在第一个约束中用一个由Turtles-own调用的变量来构造一个类型化的数字，以便每只海龟都能进行自己的优化。在这里，您可以获得代码的正常功能版本。

extensions [ lpsolver ]
turtles-own [ output x1 x2 ]

to setup
  clear-all
  create-turtles 2 [ setxy random-xcor random-ycor ]
end

to go
  ask turtles [

      let numvar 2
      let con [
            [ 1 1 1 600000 ]  ; first constraint. Typing numbers, it works
            [ -2 1 2 0 ]
            [ 0 1 2 150000 ]
          ]
      let obj [ 1 0.9 ]
      let bins [ 1 1 ]
      let results (lpsolver:max numvar con obj bins)

      set output first results             ; these 4 lines are
      let results2 but-first results       ; just to store the
      set x1 first results2                ; results in the
      set x2 last results2                 ; turtles-own variables
  ]
end

这是当我尝试用乌龟拥有的变量替换600000的时候。

extensions [ lpsolver ]
turtles-own [ try output x1 x2 ]

to setup
  clear-all
  create-turtles 2 [ setxy random-xcor random-ycor ]
  ask turtles [ set try 600000 ]
end

to go
  ask turtles [

      let numvar 2
      let con [
            [ 1 1 1 try ]  ; now I get the "expected a constant error"
            [ -2 1 2 0 ]
            [ 0 1 2 150000 ]
          ]
      let obj [ 1 0.9 ]
      let bins [ 1 1 ]
      let results (lpsolver:max numvar con obj bins)

      set output first results             ; these 4 lines are
      let results2 but-first results       ; just to store the
      set x1 first results2                ; results in the
      set x2 last results2                 ; turtles-own variables
  ]
end

我知道NetLogo在尝试为它提供一个变量（由Turtle拥有）时要求我提供一个常量，因此，由于我对NetLogo和任何编程语言都不熟悉，因此我尝试了所有方法：方括号，在过程中或外部创建列表，然后尝试将这些列表放置在严格但始终相同的错误中。唯一的区别是当我尝试使用倒逗号时，例如“尝试”。在这种情况下，“尝试”变为橙色（在《 NetLogo编程指南》中，常量为橙色），当我尝试从“代码”选项卡转到“接口”选项卡时，没有立即出现错误。但是，当我尝试单击GO时，收到了大错误消息。我猜是因为“ try”是一个字符串，但是我真的不知道。如果需要，我将完整的错误消息放在最后。

我该怎么办？预先感谢！

NetLogo is unable to supply you with more details about this error.  Please report the problem
at https://github.com/NetLogo/NetLogo/issues, or to bugs@ccl.northwestern.edu, and paste the
contents of this window into your report.

java.lang.UnsatisfiedLinkError: Native Library C:\Program Files\NetLogo 5.3.1\lpsolve55j.dll already loaded in another classloader
 at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1904)
 at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1854)
 at java.lang.Runtime.loadLibrary0(Runtime.java:870)
 at java.lang.System.loadLibrary(System.java:1122)
 at lpsolve.LpSolve.<clinit>(LpSolve.java:275)
 at lp.report(lp.java:63)
 at org.nlogo.prim._externreport.report(_externreport.java:50)
 at org.nlogo.prim._let.perform(_let.java:28)
 at org.nlogo.nvm.Context.runExclusive(Context.java:119)
 at org.nlogo.nvm.ExclusiveJob.run(ExclusiveJob.java:57)
 at org.nlogo.nvm.Context.runExclusiveJob(Context.java:162)
 at org.nlogo.prim._asm_procedurego_ask_0.perform(:1)
 at org.nlogo.nvm.Context.stepConcurrent(Context.java:91)
 at org.nlogo.nvm.ConcurrentJob.step(ConcurrentJob.java:82)
 at org.nlogo.job.JobThread.org$nlogo$job$JobThread$$runPrimaryJobs(JobThread.scala:143)
 at org.nlogo.job.JobThread$$anonfun$run$1.apply$mcV$sp(JobThread.scala:78)
 at org.nlogo.job.JobThread$$anonfun$run$1.apply(JobThread.scala:76)
 at org.nlogo.job.JobThread$$anonfun$run$1.apply(JobThread.scala:76)
 at scala.util.control.Exception$Catch.apply(Exception.scala:88)
 at org.nlogo.util.Exceptions$.handling(Exceptions.scala:41)
 at org.nlogo.job.JobThread.run(JobThread.scala:75)

NetLogo 5.3.1
main: org.nlogo.app.AppFrame
thread: AWT-EventQueue-0
Java HotSpot(TM) 64-Bit Server VM 1.8.0_74 (Oracle Corporation; 1.8.0_74-b02)
operating system: Windows 10 10.0 (amd64 processor)
Scala version 2.9.2
JOGL: (3D View not initialized)
OpenGL Graphics: (3D View not initialized)
model: Untitled

09:56:42.291 AddJobEvent (org.nlogo.window.ButtonWidget) AWT-EventQueue-0
09:56:42.245 PeriodicUpdateEvent (org.nlogo.app.App$$anon$1 (org.nlogo.window.GUIWorkspace)) AWT-EventQueue-0
09:56:42.212 InputBoxLoseFocusEvent (org.nlogo.window.ButtonWidget) AWT-EventQueue-0
09:56:42.045 PeriodicUpdateEvent (org.nlogo.app.App$$anon$1 (org.nlogo.window.GUIWorkspace)) AWT-EventQueue-0
09:56:41.845 PeriodicUpdateEvent (org.nlogo.app.App$$anon$1 (org.nlogo.window.GUIWorkspace)) AWT-EventQueue-0
09:56:41.644 PeriodicUpdateEvent (org.nlogo.app.App$$anon$1 (org.nlogo.window.GUIWorkspace)) AWT-EventQueue-0
09:56:41.443 PeriodicUpdateEvent (org.nlogo.app.App$$anon$1 (org.nlogo.window.GUIWorkspace)) AWT-EventQueue-0
09:56:41.242 PeriodicUpdateEvent (org.nlogo.app.App$$anon$1 (org.nlogo.window.GUIWorkspace)) AWT-EventQueue-0
09:56:41.041 PeriodicUpdateEvent (org.nlogo.app.App$$anon$1 (org.nlogo.window.GUIWorkspace)) AWT-EventQueue-0
09:56:40.841 PeriodicUpdateEvent (org.nlogo.app.App$$anon$1 (org.nlogo.window.GUIWorkspace)) AWT-EventQueue-0

带有lpsolve扩展的NetLogo错误-预期常数

0 个答案: