Hi. In the help page for "lp" in package lpSolve, regarding
"const.dir" it says:
const.dir: Vector of character strings giving the direction of the
constraint: each value should be one of "<," "<=," "=," "==," ">," or
">=". (In each pair the two values are identical.)
I am having trouble understanding the sentence in parenthesis. What
are the pairs to which the sentence is referring?
More particularly, I am trying to perform linear programming in which
I want to use equality constraints. That is, I want to implement a
constraint of the form A %*% x = b. To do so, should I use
const.dir <- c("==", "==", "==")
or should I use
const.dir <- c("=", "=", "=")
i.e., should I use strings with one or two equals signs?
Thanks.
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