Read rosbag file - change between R2018b to R2020b

Hi,

In MATLAB R2018b I was using the command

Bag = rosbag(RosbagFileName) 

and it was working fine.

When trying to use the same command with the same file on MATLAB R2020, I get the follwoing error:

The class ros.Bag has no Constant property or Static method named 'parse'.

Any idea what could be the problem?

[Jagadeesh Konakalla]

Hi,

Can you please share the rosbag file and script that you are using to reproduce error on our end ?

Thanks,

Jagadeesh K.

[Avishay Assayag]

Hi Jagadeesh,

The script I'm using is quite simple:

Bag = rosbag('2021_06_01_12_54_26_MATLAB_Error.bag')

And the error I get is:

The class ros.Bag has no Constant property or Static method named 'parse'.

I will send you a link to the file in a private message.

Thanks!

[Avishay Assayag]

Thank you Cam!

The commands you provided helped me find the problem.

I found that I had a an old MATLAB code in my path, outside of the ROS toolbox folder, that is also dealing with rosbag files, apparently there was a conflict.

Answer 1

[Cam Salzberger]

Hey Avishay,

I haven't seen the file, but these kinds of errors can come up if you have something shadowing functions or objects. Can you run these commands in your MATLAB?:

which -all ros.Bag
which -all ros.BagSelection
which -all rosbag

-Cam