Fix divide-by-zero in ExpDeproj::initialize() when ngrid < 2

[Copilot]

The initialize() method computed dlogr = (log_rmax - log_rmin)/(ngrid - 1) but only validated ngrid > 0, causing division by zero when ngrid == 1.

Changes

• Updated validation to require ngrid >= 2
• Changed error message from "n must be positive" to "n must be at least 2"

void ExpDeproj::initialize()
{
-  if (ngrid <= 0) {
-    throw std::invalid_argument("n must be positive");
+  if (ngrid < 2) {
+    throw std::invalid_argument("n must be at least 2");
  }
  // ...
  double dlogr = (log_rmax - log_rmin)/static_cast<double>(ngrid - 1);

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.

[Copilot]

Just as a heads up, I was blocked by some firewall rules while working on your feedback. Expand below for details.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https /usr/lib/apt/methods/https (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

[The9Cat]

All good.