matlab write equation in MATLAB? -

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i have data in x , y, , want solve the next equation using matlab. how can write matlab code equation ?

y= y1, ...,y(n-1),yn; x=x1,...x(n-1),xn

for example

c= 0.2345+5.423*y(n-1)*x(n-3)+2*y(n-5)*x(n-4)

ok, describing vector/matrix multiplication problem, can code as:

c0 = 0.2345; % first constant use in c  n = 6;       % sake of argument, assume n=6;  m = [ 0      2      0      0      0      0;       0      0      0      0      0      0;       0      0      0      0      0      0;       0      0      0      0      0      0;       0      0      5.423  0      0      0;       0      0      0      0      0      0];  c = c0 + y' * m * x;

i assuming both vectors, x , y column vectors. matlab notation says y' transpose of vector y, row vector.

when write c = c0 + y'*m*x, (using pseudo-code)

c = c0 + sum(i=1:n)( sum(j=1:n)( m(i,j) * y(i) * x(j) ) )

please note approach allows store any factor multiplying y(i)*x(j) in position m(i,j).


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