Access and extract table array using for loop
2 views (last 30 days)
Show older comments
I have this table
tt = edfread('example.edf')
and I need to extract (or access) the data using "for loop". For example, from "ECG", we can extract the data from 0 sec, 10 sec, 20 sec, etc. without typing the code one-by-one manually. What should I do? Thank you.
0 Comments
Answers (3)
VBBV
on 13 Apr 2023
Edited: VBBV
on 13 Apr 2023
tt = edfread('example.edf')
tt = timetable2table(tt);
tt.Properties.VariableNames = {'Time','ECG','EEG2'};
for k = 1:length(tt.ECG)
fprintf('ECG Data at %s is\n',[tt.Time(k)])
cell2mat(tt.ECG(k))
end
4 Comments
VBBV
on 13 Apr 2023
Edited: VBBV
on 14 Apr 2023
You can access all table data without inputting one by one as shown below
tt = edfread('example.edf');
tt = timetable2table(tt);
tt.Properties.VariableNames = {'Time','ECG1','ECG2'};
%%% for large number of variables %%%
% fprintf(repmat('%s Data',1,100) \n', string(tt.Properties.VariableNames(2:end)))
fprintf('%s Data %s Data \n', string(tt.Properties.VariableNames(2:end)))
for k = 1:length(tt.ECG1)
fprintf('at %s is\n',tt.Time(k))
% access all data from table without inputting one by one
Data = cell2mat(table2cell(tt(k,2:end)))
end
Ran Yang
on 13 Apr 2023
You can call everything in the ECG column using {:} and then concatenate it. Note the curly brackets.
data = cat(1, tt.ECG{:});
You can also specify a subset of rows (e.g. 0 sec, 20 sec, 40 sec) in the same way you would index a regular array.
subdata = cat(1, tt.ECG{1:2:5});
Stephen23
on 13 Apr 2023
"I need to extract (or access) the data using "for loop". For example, from "ECG", we can extract the data from 0 sec, 10 sec, 20 sec, etc. without typing the code one-by-one manually."
You can use curly-brace indexing:
Note that the example numeric data is nested in cell arrays in a table:
T = edfread('example.edf')
for ii = 1:height(T)
for jj = 1:width(T)
V = T{ii,jj}{:}
end
end
0 Comments
See Also
Categories
Find more on Logical in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!