Create vector for data after each iteration of a for loop

I can't seem to figure out how to make a vector that after each iteration of a for loop takes the value of the set variable, and adds a data point. Below I added a pseudo-code example of what I'm trying to accomplish. When I try to make anything of the sort, it just overwrites the previous value.

y = x;
z = 0*y;
for n = 0:N
  z = Z+1+2.*n
end

How can I, after N iterations, make a column vector(e.g. Vect) that does the following:

Iteration 1:

N = 0;

z = 1;

Vect [1]

Iteration 2:

N = 1;

z = 4;

Vect [1,4]

Iteration 3:

N = 2;

z = 9;

Vect [1,4,9]

etc... ??

Answer 1

[Geoff Hayes]

Matthew - try doing the following

 y = x;
 z = 0*y;
 myVector = zeros(N+1,1);
 for n = 0:N
     z = z+1+2.*n
     myVector(n+1) = z;
 end

Note how we pre-size the myVector array given that there are N+1 elements. We then just update this array on each iteration of the for loop.

[Rasik Michailov]

Geoff Hayes, Thank you so much your example helped me a lot !

[Sara Fawal]

Hello Geoff,

I am trying to do something similar but my indexing is not a whole number

for j=3:0.005:7

So, how can I create a vector to save all the single output answers (after each iteration) from my for loop.

In the end my vector (for each variable) wıll be a single column by 800 rows filled with the data that I need Please help.

Thank you very much.

[Geoff Hayes]

Sara - you could try doing something like

 results = zeros(801,1); % since 801 elements in range 3:0.005:7
 k = 1;
 for j=3:0.005:7
    % do some calculation
    results(k) = ...; % your result
    k = k + 1;
 end

Or perhaps

 myRange = 3:0.005:7;
 myResults = zeros(size(myRange));
 for k=1:length(myRange)
    j = myRange(k);
    % do some calculation with j
    results(k) = ...; your result
 end