How to display a subjects mean reaction time as a bar chart?

Hi, I have collected participants reaction time to the presentation of stimuli. I have the reaction time data for 4 participants, these are saved in a CSV file along with their keyboard response. I was wondering how you could go about extracting the mean reaction time for each participant, and displaying this in an individual bar chart for each participant.

Also is there a way of combining the reaction times for each participant, and displaying that in a single bar chart?

T=table(response,rts);
writetable(T,'participant_01_sequence.csv'); %this is how I saved participants response and their reaction time in a CSV file

Thank you for any help anyone can offer.