Error: "Dot indexing is not supported for this variable"

I am trying to run the MATLAB script ad9361_ModeS.m and getting an error "Dot indexing is not supported for variables of this type" in line 54. Any suggestions?

Answer 1

[Walter Roberson]

Line 54 contains

input_content = cell(1, s.in_ch_no + length(s.iio_dev_cfg.cfg_ch));

The error implies that s.iio_dev_cfg is not a struct or object.

The code for the initializing class appears to be at https://github.com/analogdevicesinc/libiio-matlab/blob/master/iio_sys_obj_matlab.m

That code initializes the iio_dev_cfg to [] . The user is responsible for invoking setupImpl(), which you do. setupImpl() is responsible for calling getObjConfig() . getObjConfig() tries to read a configuration file and sets the iio_dev_cfg to {} if it fails, and to a structure if it works. setupImpl() should invoke error() if it finds that the configuration is empty such as {} .

I would have expected, then, that you would have reached an error condition; I do not see at the moment any other way you could have the error on line 54... unless you are using a different iio_sys_obj_matlab

I suggest that you debug and check to see what class() of s.iio_dev_cfg is when the error occurs.

[Md Anowar Hossain]

Many thanks to Walter Roberson for your prompt reply.

After debugging I found that the class of s.iio_dev_cfg is 'double'.(s=-1, showing in workspace).

While I was debugging step-by-step, I found another error in line 51 [s=s.setupImpl();], which is showing "Could not connect to the IIO server" (User-defined error).

[Walter Roberson]

Perhaps you are using a different version of that function.

[Md Anowar Hossain]

I am using the same function from your given link.

I am using "AD9361" and "Zedboard".

Is the problem related to the ethernet connection between host PC and FPGA?