MATLAB Answers

Creating a run log/count with a for loop within a table.

3 views (last 30 days)
Craig Stevens
Craig Stevens on 10 Mar 2020
Commented: Craig Stevens on 10 Mar 2020
I have a table that has a time column and a binary stability column (1 for stable data, 0 for non). I want to create a run count / run log for the stable data as shown below. The idea is to group stable data into "runs" then breakdown the table and export these runs into separate tables or to identify what range in which a run occurs. The table is rather long ~30000 lines, so I figured a for loop would be best but I am having difficulty identifying the conditional criteria. I appreciate any assistance.

  1 Comment

dpb
dpb on 10 Mar 2020
Attach the sample data (can make it up, but whole lot easier otherwise... :) )

Sign in to comment.

Answers (1)

Stijn Haenen
Stijn Haenen on 10 Mar 2020
Edited: dpb on 10 Mar 2020
I think this is what you are looking for:
switch_list=zeros(length(data),1);
switch_list(2:end)=data(2:end,2)-data(1:end-1,2);
up_list=find(switch_list==1);
down_list=find(switch_list==-1)-1;
for i=1:length(up_list)
data(up_list(i):down_list(i),3)=i;
end
I made my own data:
data = [
1 0
2 0
3 0
4 1
5 1
6 0
7 0
8 1
9 0
10 0
11 1
12 1
13 1
14 0
15 0
16 0
17 0
18 1
19 1
20 1
21 0
22 0
23 0
24 1
25 1
26 0
27 1
28 0];

  7 Comments

Show 4 older comments
Stijn Haenen
Stijn Haenen on 10 Mar 2020
you should use a matirx not a table, then it will work.
you can do this with the function: table2array
Craig Stevens
Craig Stevens on 10 Mar 2020
I'd prefer a table solution, if possible, due to everything else being in tables. I changed it as you suggessted...
StableOut = table2array(StableOut);
switch_list=zeros(length(StableOut),1);
switch_list(2:end)=StableOut(2:end,2)-StableOut(1:end-1,2);
up_list=find(switch_list==1);
down_list=find(switch_list==-1)-1;
for i=1:length(up_list)
StableOut(up_list(i):down_list(i),3)=i;
end
Recieved the errors:
The following error occurred converting from duration to double:
Undefined function 'double' for input arguments of type 'duration'. To convert from durations to numeric, use the SECONDS, MINUTES,
HOURS, DAYS, or YEARS functions.
Error in Scanner (line 137)
switch_list(2:end)=StableOut(2:end,2)-StableOut(1:end-1,2);
Craig Stevens
Craig Stevens on 10 Mar 2020
I appreciate all the help. I was able to accomplish what I wanted through a series of if statements within a for loop. Thank you again for your assistance.

Sign in to comment.

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!