How to replace the MATLAB functions table and table2array in Octave?

Question

I want to run my MATLAB script in Octave but have problems with the table function which does not yet exist in Octave.

An extract of the table that I want to work with looks as follows:

Rotation angle  Measured distance
-0,342  0,000
-1,440  0,000
-10,422 0,000
-11,574 0,000
-21,060 0,000
-21,528 0,000
-30,402 0,000

To create my output variable I am using the following code in MATLAB.

data = table;
data.Rotationangle = cell2mat(raw(:, 1));
data.Measureddistance = cell2mat(raw(:, 2));

In Octave I get the following error then.

warning: the 'table' function is not yet implemented in Octave

Please read <https://www.octave.org/missing.html> to learn how you can
contribute missing functionality.
error: 'table' undefined near line 102 column 8
error: called from
    Cloud_reconstruction at line 102 column 6

My question is now, is there any opportunity to replace the table function in Octave? I tried to find a solution with Octave data frame package but was not really able to.

In the same script I am also using the table2array function which is also not yet implemented in Octave and will later occur an error as well.

data = table2array(data);

I would be glad if someone could help me with that.

Wolfie Wolfie · Accepted Answer · 2019-10-16T12:48:07

You can use similar syntax for "column" indexing with a struct

data = struct;
data.var1 = [1;2;3;4];
data.var2 = [5;6;7;8];

However, you lose a lot of the table-specific operations available in MATLAB.

If you've got the above data, you can use struct2array instead of table2array for your conversion to a matrix

data = struct2array( data );

If you are using table2array anyway, you'll end up with a matrix, so why not just stick to matrices in the first place? If all of your data is numeric, they will be generally faster to operate on.

data = [cell2mat(raw(:,1)), cell2mat(raw(:,2))];

Edit: it appears struct2array may also be missing from Octave. However, in that missing link you can find several attachments for equivalent functions.

How to replace the MATLAB functions table and table2array in Octave?

2 Answers