concatenate

I have a for-loop that executes commands and displays the answer for each iteration. Please, can someone tell me how to concatenate all the answers into an array instead of having the results displayed independently for each iteration. cheers.

[Rajeev]

hey me too searching for the same question did u get the answer?

[Rajeev]

if u store ur answer in A. then give A as A[ ]; in array form it will store automaticly

Answer 1

[Walter Roberson]

Paulo answered the question as you phrased it, but if you know the exact number of results you are producing (or if the maximum number of results is "reasonably close" to the likely number of results), then you are better off pre-allocating memory for the results:

a = zeros(10,1);
for b = 1:10
  a(b) = 3*b+5;  %for example
end

When you get to thousands of elements, pre-allocating can be much much faster.

[God'sSon]

thanks for your answer.

I fancy the idea of pre-allocating memory but I couldnt implement it with my code.

consider this example:

a= 2 1 3 1

1 4 1 5

6 7 1 1

8 1 9 1

for i=(1:4)

row=(a(i,:));

b=sort(row)

end

I need an answer which is (b= 4x4 array) like the original (a)

cheers.

[Walter Roberson]

b = zeros(size(a));

for i = 1:size(a,1)

b(i,:) = sort(a(i,:))

end

Or more simply,

b = sort(a,2);

Answer 2

[Paulo Silva]

a=[]
for b=1:10
a=[a b] %replace the b with the data you want to store per iteration
end

a %result is inside this variable

The code doesn't do any memory pre-allocation!!