Concatenate into a matrix is not saving and is overriding every iteration?

2 ビュー (過去 30 日間)
nines
nines 2022 年 6 月 14 日
編集済み: Matt J 2022 年 6 月 14 日
I have 2 subjects where each subject has three conditions. I made an array where each row is 1*3 representing one subject with the three conditions. I now want to add each subjects' array together.
However, my code seems to be overwriting every round, when I want:
%subject 1
percent_change = [1 2 3]
%subject 2
percent_change = [3 4 5]
%what I want as ouput:
percent_change_matrix: 1 2 3
3 4 5
Here is what I have tried:
%try 1
subjs = {'subject1' 'subject2'}
time = {'30-50' '50-60' '60-70'}
%% defining tac components for pet plot
for s = 1:length(subjs)
subj = subjs{s}
for i = 1:length(time)
time = time{i}
percent_change(:,i) = ((task-baseline)/baseline)*100 %task=2 baseline=1
end
percent_change_matrix = []
percent_change_matrix = [percent_change_matrix; percent_change]
end
I have also tried:
%try 2
subjs = {'subject1' 'subject2'}
time = {'30-50' '50-60' '60-70'}
%% defining tac components for pet plot
for s = 1:length(subjs)
subj = subjs{s}
for i = 1:length(time)
time = time{i}
percent_change(:,i) = ((task-baseline)/baseline)*100
end
try
percent_change_matrix = [percent_change_matrix; percent_change]
catch
percent_change_matrix = [percent_change_matrix]
end
end
my output for try 1 and try2 is:
percent_change_matrix: [3 4 5]
There are no errors with eithor of my codes, but the matrixes are not being built upon eachother. Do you have any suggestions? Thanks so much!
  7 件のコメント
Ganesh
Ganesh 2022 年 6 月 14 日
The issue is that percent_change_matrix is being redefined to an empty array at every iteration for subject. Move the declaration of this to the beginning, or immediately following 'time' variable.
Another issue that may arise seems to be
time = time{i}
This would redefine your time variable. Consider naming one of the variables differently.

サインインしてコメントする。

採用された回答

Matt J
Matt J 2022 年 6 月 14 日
編集済み: Matt J 2022 年 6 月 14 日
Ns=numel(subjs); Nt=numel(time);
percent_change=cell(Ns,1);
for s = 1:Ns
subj = subjs{s};
for i = Nt:-1:1
...
percent_change{s}(:,i) = ((task-baseline)/baseline)*100 %task=2 baseline=1
end
end
percent_change_matrix=cell2mat(percent_change);

その他の回答 (0 件)

Community Treasure Hunt

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

Start Hunting!

Translated by