Dot indexing Error Running Script on Matlab Production Server

Hello,

I load a .mat file from a script running on Matlab Production Server. The file contains a struct.

Running on my desktop, I can access values in the structure like this:

histo_test = dataset_loaded(3).volfeats_EWM_histo.Values(2:10);

But on Matlab Production Server, that line of code produces this error:

'Dot indexing is not supported for variables of this type.'

I know the the structure loads correcly because the length of the structure is correct.

How can I access the parameters of a structure from a script running on Matlab Production Server?

Answer 1

[Kojiro Saito]

After reading this question, I think this issue might be because you're loading a mat file with an output argument.

dataset_load = load('dataset_scaled_fixedBins.mat');

So, you can access the original structure data by accessing dataset_load.dataset_load.

dataset_loaded = dataset_load.dataset_load;
histo_test = dataset_loaded(3).volfeats_EWM_histo.Values(2:10);

[Marc McLean]

Hello Kojiro,

This is my code to load:

    dataset_load = load('dataset_scaled_fixedBins.mat');
    dataset_loaded = dataset_load.dataset;
    dataset_length = size(dataset_loaded);
    disp_histo = dataset_loaded(3).volfeats_EWM_histo;

This works fine on my desktop but the last line produces a dot indexing error when compiled and run on Matlab Production Server. However, the third line, dataset_length is the correct length on Matlab Production Server so I believe the dataset is loaded but why does the last line error on Matlab production server but run fine on my desktop?

[Kojiro Saito]

Are there any data type difference in MATLAB desktop and MATLAB Production Server?

You can find data types by whos command

dataset_load = load('dataset_scaled_fixedBins.mat');
dataset_loaded = dataset_load.dataset;
dataset_length = size(dataset_loaded);
whos dataset_loaded

And you can find whos results in main.log of Production Server.