How do you append to a matrix within a for loop?
显示 更早的评论
Hi, I am using a for loop to process data (this part works fine). What I need to do is take the matrix (A) and after each loop update A to create one matrix. For instance, in the image below A is produced on the first loop, during loop 2 A "grows" to include the data from loop 1 and the data from loop 2, and so on.
Loop 1 produces a matrix, on the next iteration I need to append to this matrix the results of that loop, and so on until all of the data is processed.
It should be noted that the number of rows on each loop is unknown. However, the number of columns is fixed to 7.
Any ideas would be greatly appreciated please.
采纳的回答
your_result = [];
for ii = whatever
some_vector = some_function(of_something);
your_result = [your_result; {some_vector}];
end
8 个评论
chels19
2016-7-8
José-Luis
2016-7-8
My pleasure.
Pradnya Raut
2019-11-6
Is there any faster way to do this, other than above method?
ardeshir moeinian
2020-3-14
I find this a very easy and nice method... how can one do this for string arrays though?
deejt
2021-1-29
I was wondering, is there also a possibility to define within the for loop at this section (marked with %here!) that I would like to insert the results in column number xy of my result matrix (here called "your_result")?
for ii = whatever
some_vector = some_function(of_something);
your_result = [your_result; {some_vector}]; % here!
end
Muhammad Ridwanur Rahim
2021-7-18
this is a beautiful solution. thank you @José-Luis
Ruijie Zhu
2021-10-4
cheers mate
Mani
2024-5-8
Nice one.
更多回答（3 个）
% make an empty array
% the main command is end+1
N=[];
for i=0:10
x=i*i;
N(end+1)=[x]
end
Manuela
2025-1-13
0 个投票
I modified the code of the first answer in order to obtain a matrix and not a list of cells:
your_result = [];
for ii = whatever
some_vector = some_function(of_something);
your_result = cat(1,your_result,some_vector);
end
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