The vertical concatenation of expressions. This is equivalent to rbind when applied to objects with the same number of columns.

vstack(...)

## Arguments

...

Expression objects, vectors, or matrices. All arguments must have the same number of columns.

## Value

An Expression representing the concatenated inputs.

## Examples

x <- Variable(2)
y <- Variable(3)
c <- matrix(1, nrow = 1, ncol = 5)
prob <- Problem(Minimize(c %*% vstack(x, y)), list(x == c(1,2), y == c(3,4,5)))
result <- solve(prob)
result$value #> [1] 15 c <- matrix(1, nrow = 1, ncol = 4) prob <- Problem(Minimize(c %*% vstack(x, x)), list(x == c(1,2))) result <- solve(prob) result$value
#> [1] 6

A <- Variable(2,2)
C <- Variable(3,2)
c <- matrix(1, nrow = 2, ncol = 2)
prob <- Problem(Minimize(sum(vstack(A, C))), list(A >= 2*c, C == -2))
result <- solve(prob)
result$value #> [1] -4 B <- Variable(2,2) c <- matrix(1, nrow = 1, ncol = 2) prob <- Problem(Minimize(sum(vstack(c %*% A, c %*% B))), list(A >= 2, B == -2)) result <- solve(prob) result$value
#> [1] 0