How to import bag file with std_msgs/String

I have a bag file that contains a topic defined as:

       /pavioliner/enc             342 msgs  : std_msgs/String    

I try to load it with:

bag = rosbag(filename);
topic1 = select(bag,'Topic',"/pavioliner/enc");
topic_data1 = readMessages(topic1);

and topic_data1 is:

topic_data1 =

342×1 cell array
>> topic_data1{1,1}.Data

ans =

'1638960492.408644536,0,0,0,-31946,8921'

I need to load into two different arrays only coloumns 5 and 6, but I can't understand how to parse the topic_data1 output.

Can you help me, please?

Answer 1

[Cam Salzberger]

It looks like this topic is passing numeric data as a string, for some reason. My recommendation would be to preallocate a couple of data arrays, loop through all the messages, split out the parts you needs, turn them into numbers, and then put them in the arrays.

-Cam