How can I code these 2 equations?

Hello

Is it possible to write these as 1-1 assignment? given.

A is , b is and is . u and l are matrices

The problematic part is the sum and the or condition. How should I modify this?

lambda_2k1 = max((b-sum(A*x_c))/A(:,k)) +  (u(k) - l(k))/2;

[David K.]

Maybe this? I am assuming that the prelim val is a vector the same size as A(:,k)

prelimVal = (b-sum(A*x_c))/A(:,k);
val1 = prelimVal(A(:,k)<0);
val2 = prelimVal(A(:,k)>0);
lambda_2k1 = max(val1) + (u(k) - l(k))/2;
lambda_2k = min(val2) - (u(k) - l(k))/2;

[Richárd Tóth]

thanks, I think it should work

[Richárd Tóth]

We should use ./ instead of / in the first line since we need division by element, not matrix division right?

[David K.]

Yes you do. Also, I think you may want to make sure the sum is summing the elements in the dimension you need them to be. If they are not, use sum( . . . , 2).

[Richárd Tóth]

Yes, summing on each row is needed and omitting the 2 gives different(incorrect) result