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Help regarding pop-push of a LIST

Neeraj Vardhan

Hi,

I was trying to save my path coordinates as a list. But when i was trying to print the list of points, got errors "unbound variable-plist" . the code is mentioned below.

 

procedure(nvToGetMyLocation()

let((point plist)

cvw=getCurrentWindow()

point=hiGetPoint(cvw)

plist=append(plist list(point))

print(point)

print(plist)

); let

); procedure_nvToGetMyLocation

 

Parents

  • Yes, but what functions are you running? 

    If you're calling nvGetMyLocation() (assuming you have a variable n defined), then p_list will be set within that function, but will be discarded (and hence no longer defined) after the prog() has finished. So if you're then trying to look at p_list in the CIW, it will be undefined - hardly surprising since it is a local variable. Similarly if you call nvMyDirection() it will be looking for a global variable p_list, which won't be defined. If it was, then it could compute local variables xy1, xy2, x1, x2 (which are defined in the let()), but these will be thrown away when the let() exits and hence when nvMyDirection exits. If you then call nvMyPath, it won't know what xy1 and xy2 are - plus the fact that the code is wrong in this function because the list of points is improperly specified.

    So PLEASE explain what you're doing. Nobody can debug by reading your mind!

    Regards,

    Andrew.

Reply

  • Yes, but what functions are you running? 

    If you're calling nvGetMyLocation() (assuming you have a variable n defined), then p_list will be set within that function, but will be discarded (and hence no longer defined) after the prog() has finished. So if you're then trying to look at p_list in the CIW, it will be undefined - hardly surprising since it is a local variable. Similarly if you call nvMyDirection() it will be looking for a global variable p_list, which won't be defined. If it was, then it could compute local variables xy1, xy2, x1, x2 (which are defined in the let()), but these will be thrown away when the let() exits and hence when nvMyDirection exits. If you then call nvMyPath, it won't know what xy1 and xy2 are - plus the fact that the code is wrong in this function because the list of points is improperly specified.

    So PLEASE explain what you're doing. Nobody can debug by reading your mind!

    Regards,

    Andrew.

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