title: How do I get R to calculate a negative IRR scenario?
body: <p>I have been doing stochastic cash flow modeling. In some of these scenarios, IRR is negative (cash flows out exceed cash flows in over time). R seems to hate this. I get a uniroot error. I have used the FinCal package irr function, and I even tried to write my own uniroot IRR formula. It's important that any formula solves for both positive and negative IRR scenarios.</p>
  
  <p>Any suggestions or ideas? Is there an R package that handles this, or a simple uniroot formula?</p>
  
  <p>Thank you! </p>