run script from desktop shortcut vs command window

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Jim
Jim 2016-5-3
编辑： Walter Roberson 2016-5-3
I set up a shortcut icon on my desktop to execute the following -
C:\Program Files\MATLAB\R2016a\bin\matlab.exe" -nodesktop -nosplash -minimize -r matlabserial
Matlabserial.m opens a serial com port and reads NMEA data from a GPS receiver.
When I launch the shortcut everything opens and the script runs to the point where I look for data on the serial port. The script then times out with no data received.
If I type matlabserial in the Matlab command window the script executes without a problem.
I put a disp('looking') command right before the lines
data1 = fgetl(obj1); % GGA
data2 = fgetl(obj1); % ATT
when launched from the shortcut I get one response. When launched from the command window a response for every time it finds the lines of data on the serial port.
I checked the path and all my subdirectories and toolkits showup.
Is the desktop shortcut not allowing the serial ports to work?

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