FW: Polhemus

Paul Groot pfc.groot at gmail.com
Sat May 25 20:35:31 UTC 2013 

I don't know anything about polhemus or the datacapture function, but it
sounds like this function generates a lot of output in the matlab command
window. You can capature this into a dummy variable by using evalc:

x = MatLab.Execute("dummy=evalc('dataCapture;');")


Mind the single and double quotes)

best
Paul


On 25 May 2013 19:53, Tobias <tobias.fw at gmail.com> wrote:

> Thanks for all the help.
>
> I have successfully implemented Polhemus in E-Prime.
>
> There is only one problem left: When a lot of data is recorded, which is
> not unusual for longer movements of particpants, the string becomes too
> long for E-Prime.
>
> I use this function:
>
> x = MatLab.Execute("dataCapture;")
>
> For longer recordings which makes data rather large the following error
> occurs:
> "Error number 14: Out of string space"
>
> The thing is, I don't really need any of the recorded data for E-Prime.
> But I can't find a way to not have E-Prime import the data into the
> variable x.
> Is there a way of executing MatLab function without forwarding data to
> Matlab?
>
> Best,
> Tobias
>
> Am Montag, 13. Mai 2013 18:23:54 UTC+2 schrieb Paul Groot:
>>
>> Hi Tobias,
>>
>> More detailed information about matlab's COM interface can be found here:
>> http://www.mathworks.nl/help/**matlab/call-matlab-com-**
>> automation-server.html<http://www.mathworks.nl/help/matlab/call-matlab-com-automation-server.html>
>>
>> There are a few functions available to pass variables, character array's,
>> matrices and workspaces between the two applications, without the need to
>> convert strings. The execute command should be used to execute scripts; not
>> for passing variables (although you can do this off course). Large objects
>> (like bitmap images) could also be passed by using external files (i.e.
>> only passing the name of the created file).
>>
>> Best
>> Paul
>>
>>
>>
>> On 13 May 2013 12:19, Tobias <tobi... at gmail.com> wrote:
>>
>>> Dear Paul,
>>>
>>> thanks a lot for this code. It works very well. There are some issued I
>>> have, though.
>>>
>>> From your script I understand that there are at least two ways of
>>> getting data from Matlab to E-Prime: Execute and getfullmatrix. Are there
>>> other ways?
>>> Also, it seems that there is no way of transmitting a variable from
>>> E-Prime to Matlab, only string values such as "b = a + a".
>>> Of course I could always use sth like
>>>
>>> Result = MatLab.Execute(CStr(eprimeVar)**)
>>>
>>> If I wanted to get the variable eprimeVar from E-Prime to Matlab. But
>>> maybe there is an easier way?
>>>
>>> Best,
>>> Tobias
>>>
>>>
>>>
>>> Am Dienstag, 7. Mai 2013 17:01:32 UTC+2 schrieb Paul Groot:
>>>>
>>>> I don't think eprime requires a special plugin like presentation,
>>>> because matlab can also be started as a so called COM server:
>>>>
>>>> Dim MatLab As Object
>>>> Dim Result As String
>>>> Dim MReal(1, 3) As Double
>>>> Dim MImag(1, 3) As Double
>>>>
>>>> Set MatLab = CreateObject("Matlab.**Applicati**on")
>>>>
>>>> 'Executing other MATLAB commands
>>>> Result = MatLab.Execute("surf(peaks)")
>>>> Debug.Print Result
>>>>
>>>> Result = MatLab.Execute("a = [1 2 3 4; 5 6 7 8]")
>>>> Debug.Print Result
>>>>
>>>> Result = MatLab.Execute("b = a + a ")
>>>> Debug.Print Result
>>>>
>>>> 'Bring matrix b into VB program
>>>> MatLab.GetFullMatrix "b", "base", MReal, MImag
>>>>
>>>> Debug.Print MReal(1,0)
>>>> Debug.Print MReal(1,1)
>>>> Debug.Print MReal(1,2)
>>>> Debug.Print MReal(1,3)
>>>>
>>>>
>>>> The above will print the following to the Debug window:
>>>>
>>>> a =
>>>>
>>>>      1     2     3     4
>>>>      5     6     7     8
>>>>
>>>>
>>>>
>>>> b =
>>>>
>>>>      2     4     6     8
>>>>     10    12    14    16
>>>>
>>>>
>>>> 10
>>>> 12
>>>> 14
>>>> 16
>>>>
>>>> The matlab figure window won't be visible though...
>>>>
>>>> Best,
>>>> Paul
>>>>
>>>>
>>>>
>>>> On 7 May 2013 16:26, David McFarlane <mcfa... at msu.edu> wrote:
>>>>
>>>>> Can you start your MATLAB script from a command line?  If so, then you
>>>>> might try using the E-Basic "Shell()" function, see that topic in the
>>>>> E-Basic Help facility.  For a user example of this, see
>>>>> http://support.pstnet.com/**foru****m/Topic1338-8-2.aspx<http://support.pstnet.com/forum/Topic1338-8-2.aspx>.  This still leaves a lot to be desired, and beyond that I have no idea.
>>>>>
>>>>> -----
>>>>> David McFarlane
>>>>> E-Prime training online:  http://psychology.msu.edu/**Wor****
>>>>> kshops_Courses/eprime.aspx<http://psychology.msu.edu/Workshops_Courses/eprime.aspx>
>>>>> Twitter:  @EPrimeMaster (https://twitter.com/**EPrimeMas****ter<https://twitter.com/EPrimeMaster>
>>>>> )
>>>>>
>>>>> /----
>>>>> Stock reminder:  1) I do not work for PST.  2) PST's trained staff
>>>>> take any and all questions at http://support.pstnet.com/e%**2D****
>>>>> prime/support/login.asp<http://support.pstnet.com/e%2Dprime/support/login.asp>, and they strive to respond to all requests in 24-48 hours, so make full
>>>>> use of it.  3) In addition, PST offers several instructional videos on
>>>>> their YouTube channel (http://www.youtube.com/user/**P****STNET<http://www.youtube.com/user/PSTNET>).  4) If you do get an answer from PST staff, please extend the courtesy
>>>>> of posting their reply back here for the sake of others.
>>>>> \----
>>>>>
>>>>>
>>>>>
>>>>> At 5/7/2013 10:08 AM Tuesday, Cognitology wrote:
>>>>>
>>>>>> Hi,
>>>>>> Never heard of a way to interface matlab from E-Prime, I'd be
>>>>>> interested if anyone would have a way. Of course, you could compile from
>>>>>> within matlab and try to go from there, but I suspect the amount of effort
>>>>>> would really not be worth it. You could, of course, just forego e-prime and
>>>>>> try Psychtoolbox.
>>>>>> Best,
>>>>>> Michiel
>>>>>>
>>>>>> From: <mailto:e-p... at googlegroups.**c**o**m>e-p... at googlegroups.com[mailto:
>>>>>> e-p... at googlegroups.**c**o**m] On Behalf Of Tobias
>>>>>>
>>>>>> Sent: 7. May 2013 13:31
>>>>>> To: <mailto:e-p... at googlegroups.**c**o**m>e-p... at googlegroups.com
>>>>>>
>>>>>> Subject: Re: Polhemus
>>>>>>
>>>>>> To be more precisely: What I need to do is to start a matlab script
>>>>>> from E-Prime.
>>>>>> "Presentation" has some plugin to connect with Matlab, but E-Prime
>>>>>> seems not to have that. But there may be another way...
>>>>>>
>>>>>> Am Montag, 6. Mai 2013 15:39:19 UTC+2 schrieb Tobias:
>>>>>> Dear all,
>>>>>>
>>>>>> Does anyone have experience with running Polhemus Liberty (the motion
>>>>>> tracking system) with E-Prime?
>>>>>>
>>>>>> Best,
>>>>>> Tobias
>>>>>>
>>>>>
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