Missing value where TRUE/FALSE needed

[nbadino]

I am trying to draw the phase diagram of the Solow economic growth model. Using y^a with a that is a non-natural number, I get:

Error in if (any(dx[i, j] != 0, dy[i, j] != 0)) { : 
  missing value where TRUE/FALSE needed

The code I use is:

solow <- function(t, y, parameters) {
  list(y^0.5)
}
example2_flowField     <- flowField(solow,
                                    xlim   = c(0, 4),
                                    ylim   = c(0, 4),
                                    system = "one.dim",
                                    add    = FALSE,
                                    xlab   = "t")

Can somebody help me?

[mjg211]

Sorry, I can't seem to reproduce this error. Can I check what version of phaseR you're running?