i am trying to get emg and force data simultaneously using parallel computing tool box but i am unable to read the data???

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avinash pabbireddy
avinash pabbireddy 2013-12-1
评论： avinash pabbireddy 2013-12-7
i am using the below code
if matlabpool('size') == 0
matlabpool open local 2
data1=zeros([122880,2]);
data2=zeros([37000,1]);
spmd
switch labindex
case 1
s = daq.createSession('ni');
s.addAnalogInputChannel('cDAQ2Mod1', 0, 'Voltage');
s.addAnalogInputChannel('cDAQ2Mod1', 1, 'Voltage');
s.Rate = 2048
s.DurationInSeconds = 60;
labBarrier
[data1,time] = s.startForeground;
case 2
delete(instrfindall);
s = serial ( 'COM5', 'BaudRate', 115200);
set(s, 'Timeout',60);
s.InputBufferSize =37000;
labBarrier
fopen(s);
data2=fread(s);
end
end
end
matlabpool close
my workspace is containing data in composite form
data1 composite
data2 composite
is there any way to solve this problem???
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avinash pabbireddy
avinash pabbireddy 2013-12-2
Error using Composite/subsref (line 48) An invalid indexing request was made
Error in sync (line 44) E=data1(:);
Caused by: Error using Composite/subsref>iCheckValuesExist (line 86) The Composite has no value on the following lab(s): 2 .

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采纳的回答

Edric Ellis
Edric Ellis 2013-12-4
The data contained within a Composite is retained on the workers. Therefore if you close the pool, the data goes away. So, you simply need to avoid closing the pool until you've got the data from the workers. One way to do this would be:
data1 = data1(:);
data2 = data2(:);
matlabpool close
Or, you could simply leave the matlabpool open.
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