how to find multiply variable in matrix multiplication

function least_square;

x=[1 2 3 4 5];

y=[4;2;5;3;7];

n=numel(x);

for i=1:n

      A(i,1)=1;

      A(i,2)=x(i);

      A(i,3)=x(i).^2;

end

we have matrix A(5x3) and matrix y(5x1) let a matrix a(3x1) satisfy Aa=y so any function or method to find matrix a?

[KSSV]

You should initilaize your matrix A. Add this line before loop.

A = zeros(n,3) ;

Read about initialization

[Stephen23]

@Vishal Rajpurohit: Note that the output matrix A should be preallocated:

https://www.mathworks.com/help/matlab/matlab_prog/preallocating-arrays.html

[Vishal Rajpurohit]

thankyou sir

Answer 1

[KSSV]

a = A\y ;

[Vishal Rajpurohit]

thank u sir