cumsum_axis function

Cumulative Sum

The cumulative sum, $\sum_{i=1}^k x_i$ for $k=1,\ldots,n$. When calling cumsum, matrices are automatically flattened into column-major order before the sum is taken. methods

cumsum_axis(expr, axis = 2)

## S4 method for signature 'Expression'
cumsum(x)

Arguments

• axis: (Optional) The dimension across which to apply the function: 1 indicates rows, and 2 indicates columns. The default is 2.
• x, expr: An Expression , vector, or matrix.

Examples

val <- cbind(c(1,2), c(3,4))
value(cumsum(Constant(val)))
value(cumsum_axis(Constant(val)))

x <- Variable(2,2)
prob <- Problem(Minimize(cumsum(x)[4]), list(x == val))
result <- solve(prob)
result$value
result$getValue(cumsum(x))