# How to delete elements from cell arrays?

32 views (last 30 days)
Jung BC on 30 Mar 2016
Answered: Walter Roberson on 31 Mar 2016
Hi, I have a cell array(1x316) which contains 316 double
numeric arrays of various sizes like 74845x1,81032x1,55434x1 and so on.
I want to delete data values from each array cells which is greater than 140 and save it in a new cell array.
Format of my data looks like below:-
inst_speed_all_user_rome.mat(cell array)->speed_kmh(variable)->
1 2 3 ... ....316(total 316 cells of arrays)
{74845x1 double},{81032x1 double},{87351x1 double},.....
sample of one array inside one of those 316 cells :
speed_kmh{1,1}-> {74845x1}= 44.889 28.445 0 156 33.46 ........
Now, for above scenario,i need to delete the data 156(which is greater than 140 here) likewise i want to delete all data values > 140 from all arrays.
Initially i have stored cell array in s1 which is a 1x1 struct with one field ->speed_kmh of size 1x316.
This is my code but i am stuck.
%%store cell array in struct s1
%%delete the values greater than 140 from cells
l = s1.speed_kmh{:};
to_delete = false(size(l));
for i=1:length(s1.speed_kmh)
if (s1.speed_kmh(i)>140)
to_delete(i) = true;
end
end
l(to_delete) = [];
##### 2 CommentsShowHide 1 older comment
Jung BC on 30 Mar 2016
Hi,It's a cell array of 316 cells.And each of those cells are double numeric arrays of diferent sizes.

Jan on 31 Mar 2016
Perhaps:
for k = 1:numel(s1.speed_kmh)
v = s1.speed_kmh{k};
s1.speed_kmh{k} = v(v <= 140);
end
Jung BC on 31 Mar 2016
Thanks a lot Jan!You are a genius!

MHN on 30 Mar 2016
l(to_delete,:) = [];
Jung BC on 31 Mar 2016
Sorry, the file is very large in size to attach here.I have edited my question above.Hope you can analyse it more clearly.

Walter Roberson on 31 Mar 2016
cellfun(@(C) struct('speed_kmh', C.speed_kmh(C.speed_kmh<=140)), s1, 'Uniform', 0)