Clear Filters
Clear Filters

Error using *equal* when indexing information for creating a structure

2 views (last 30 days)
Hi all,
I am trying to create a structure, by indexing from a cell array (which I define as follows):
Behaviours = {"Wall Jump"; "Move Isolated"; "Rear Isolated"; "SAP";
"Stop Isolated"; "Huddling"; "Contact"; "Move in contact"}
Here is the code for creating the structure:
for k =1:size(Behaviours)
AnimalData(k).behaviour = Behaviours(k);
AnimalData(k).All_Instances = dat(dat.NAME == Behaviours(k), :);
end
I wish to loop through each of these behaviours, and want to make a structure that contains all the information that I have in relation to each of these behaviours. However, when I try to pull the behavioural data from the "dat" structure that contains all my data I get the following error:
Error using == (line 25)
Invalid types for comparison.
Line 25 corresponds to the last line of my "for" loop. If I replace "Behaviours(k), :) with one of my behaviours, I do not get this error.
Can someone tell me what I am doing wrong?
  3 Comments
Amy Hassett
Amy Hassett on 23 Mar 2020
To give you an idea, here is my dat Table.
Making the changes you recommend, here is the new code:
for k =1:size(Behaviours)
data(k).behaviour = Behaviours(k);
data(k).All_Instances = dat(strcmp(dat.NAME, Behaviours(k)));
end
When I run it, data.All_Instances is just a bunch of empty cells. Any advice?

Sign in to comment.

Answers (1)

Adam Danz
Adam Danz on 23 Mar 2020
It doesn't look like you applied the recommendation correctly.
strcmp() returns a logical vector identifying which rows are a match. Try this.
data(k).All_Instances = dat(strcmp(dat.NAME, Behaviours(k)),:);
  2 Comments
Amy Hassett
Amy Hassett on 23 Mar 2020
This gave an empty set, but it did make me think to try this:
for k =1:size(Behaviours)
data(k).behaviour = Behaviours(k);
data(k).All_Instances = dat(dat.NAME == data(k).behaviour, :);
end
Which worked!
Adam Danz
Adam Danz on 23 Mar 2020
Edited: Adam Danz on 24 Mar 2020
If you attach a mat file containing the dat table, I could take a look at what's happening.
save('datData.mat', 'dat')
Are you sure the variables you're working with are string arrays rather than cell arrays of character vectors?

Sign in to comment.

Categories

Find more on Characters and Strings 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!