how to fill a matrix?

Hi everyone. I'm trying to make code in which every time I run the code I have different values of X, and I what to save them in a matrix that changes size.

med = 8 (this value changes)

X = 2 (this value changes)

VecVal = zeros(1,med)

[darova]

Can you please describe the process? Can you be more precise?

[Laura Echeverri Zea]

i have to make measurements, so it will give everytime I'm going to have a different value of X, and i have to store those values each time so i can process them later on, but i don't know how many measurement i'm going to make, so i don't have the size of the matrix, so i created VecVal=zeros(1,med), where med is the number of measurements im making, and i want to start filling the matrix with the values of each measurement.

[Image Analyst]

So? What's wrong with that?

[darova]

Exactly. Im curious

[Laura Echeverri Zea]

i'm sorry, im terrible expresing myself in eanglish...well, i don't know how to fill the matrix, because every time i run the code the matrix does only saves the new value and not the last ones, i dont know how to add the new mesurement values to the matrix with out deliting the ones from the other mesurements

Answer 1

[Fabio Freschi]

If I understand correctly

% number of measurements
med = 8;

% preallocation
VecVal = zeros(1,med);

% the measurement
X = 2;

% put it in a specified position, i.e. as first element
VecVal(1) = X;

[Laura Echeverri Zea]

thank you... and do you know how can i add another value of x to the matrix?

[Fabio Freschi]

VecVal(2) = Y;
VecVal(3) = Z;

Or you can do this in a loop

for i = 1:5
    X = myNiceEvaluation;
    VecVal(i) = X;
end

Answer 2

[Laura Echeverri Zea]

thank you :)