How can I assign a variable to all the columns and all the rows of a matrix?

31 ビュー (過去 30 日間)
Mau Dudas
Mau Dudas 2019 年 10 月 23 日
回答済み: Jos (10584) 2019 年 10 月 23 日
Got a 20x10 double matrix and I'd like to assign 'numsub' to the number of rows and 'numtrials' to the number of columns in the whole matrix so that I can use them as an index in a for loop for extracting values from certain subjects.
I will need to do something like this:
for i = 1:numsubs
disp(['sub' num2str(i)])
disp('Slow trial')
for j=1:numtrials
if RT(j,i)<=0.3
disp(['trial' num2str(j)])
end(x3)

採用された回答

Jos (10584)
Jos (10584) 2019 年 10 月 23 日
Are you looking for the function SIZE?
data = rand(20,10) ;
[numsubs, numtrials] = size(data)

その他の回答 (1 件)

Bob Thompson
Bob Thompson 2019 年 10 月 23 日
You don't need to actually create a new variable for this, you can just use the results from size.
A = randi(100,20,10);
[r,c] = size(A); % Where r is the number of rows, and c is the number of columns
% You can also just put the function directly into your loop
for i = 1:size(A,1)
...
for j = 1:size(A,2)
...
end
end

カテゴリ

Help Center および File ExchangeMatrix Indexing についてさらに検索

タグ

Community Treasure Hunt

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

Start Hunting!

Translated by