Problems defining a multifit

[yus]

@faca87

but I get

multiflares.cpp:128:206: error: indirection requires pointer operand ('int' invalid)
  ...* nParameters + 2] - x[0]) / par[i * nParameters + 3]) + exp((x[0] - par[i * nParameters + 2]) / par[i * nParameters + 4]))**-1;

Because ** does not exponentiate in C++. You need the pow operator for that.