taking multiple column to form a struct

8 views (last 30 days)
Sharah
Sharah on 21 Dec 2015
Commented: Guillaume on 21 Dec 2015
hello, I have a data set from text file, which is a 1x 13 size file. first I diff the data only to take the value of the data from clumn 13 (the counter) when it increases (some have repeated same numbers).
DataCube = textscan(D, '%f %f %f %f %f %f %f %f %f %f %f %f %f', 'HeaderLines', 13);
f = [true;diff(DataCube{1,13})~=0];
then when I try to extract the rest of the data into a struct such that:
Kid(1).Force{1,1:6} = DataCube{:, 1:6}(f==1);
the result returns: Expected one output from a curly brace or dot indexing expression, but there were 6 results. apart from extracting them individually, how else can I extract them in one go?

Answers (1)

Guillaume
Guillaume on 21 Dec 2015
First, f==1 is a no-op, it's exactly the same as f.
Note that DataCube{:, 1:6} returns 6*number or rows individual values, so you would need as many output variables. It's probably not what you wanted to do. Possibly, this is what you wanted to do:
Kid.Force = DataCube(f, 1:6);
This will store the cell array only for those rows where f is true into a single field of your structure.
I looks like you're a bit confused by cell array syntax. My advice is to drop the cell array by converting it straight away to matrix, since it only holds scalar numerics:
DataCube = cell2mat(textscan(D, '%f %f %f %f %f %f %f %f %f %f %f %f %f', 'HeaderLines', 13));
f = [true;diff(DataCube(:,13))~=0]; %did you make a typo and replace : with 1?
  2 Comments
Sharah
Sharah on 21 Dec 2015
i need the value of f when it is not equal to 0.
the solution still doesnt solve the problem of
Kid(subject).Force{trial,1:6} = DataCube(f, 1:6);
this is put in a double for loop, there are 6 components of force and i want to put them in different struct so that i can reach each data by Kid(1).Force{1, 2} for force 2 trial 1 kid 1
Guillaume
Guillaume on 21 Dec 2015
f is already logical (0s and 1s), so comparing it to 1 returns the exact same values: 0==1 -> 0, 1==1 -> 1
I do not understand what you're trying to do with your Force{trial, 1:6}. It looks like you are trying to distribute your 6 columns of the cell array to 6 columns of the Force field, but at the same time, f is likely to select several rows which you are trying to put into a single row (trial).
What in your DataCube cell array corresponds to a given force or trial?

Sign in to comment.

Categories

Find more on Structures 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!