A basic example of the simplex function in R with errors

Question

Good morning, I have a question to an optimization problem I can\'t solve in R but in Excel:

I would like to optimize the following situation (Transportation of material

Answer 1

I don't know an exact reason (so this isn't an essential solution). But I know the error is solved when you set an upper limit with A1 and b1 even if b1 is a enormous value.

For example;

simplex(a, A1 = c(1, 1), b1 = 1.0E+12, A2 = A2, b2 = b2, maxi = FALSE)