how automatically label multiple outputs in the loop?

hi how automatically label multiple outputs in the loop? I do not know it is possible or not... may be it is very basic...

I mean basically

for i=1:3
x=i^2
end

here the outputs

x =  
     1  
x =  
     4  
x =  
     9
I want to label those x st

x(1)=1
x(2)=4
x(3)=9

Answer 1

[Dr. Seis]

If you know how many elements in x there will be (3 in your example), then it is best to initialize the output:

x = zeros(3,1); % 3 rows and 1 column of zeros

Then perform your calculations:

for i = 1 : 3
  x(i) = i^2;
end

[frwmetric]

I don't know how many elements in x... actually this is my another problem...

[Dr. Seis]

You do not "need" to initialize... Matlab might complain that the size of x appears to increase during each loop, but it should still work without initializing. If x gets very large, then you can see significant speed-up by initializing.

[Image Analyst]

You can initialize to the max you ever expect to see, and then truncate later once you know the number of elements you actually need:

% Preallocate space for as many as 3 million elements.
x = zeros(3000000,1); % 3 million rows and 1 column of zeros

Then perform your calculations:

for i = 1 : 2000000 % 2 million.
  x(i) = i^2;
end
% Truncate to known length of 2 million elements.
x = x(1:2000000);

[Iain]

You could also do the loop in the opposite direction. High indices to low indices.

Answer 2

[José-Luis]

x = 1:3; %Creating a vector of values
your_result = x.^2; %squaring element by element
x(1)
x(2)
x(3)

I would recommend you read the Getting started part of the documentation.