The FUNCT procedure evaluates the sum of a Gaussian and a 2nd-order polynomial and optionally returns the value of its partial derivatives. Normally, this function is used by CURVEFIT to fit the sum of a line and a varying background to actual data.

This routine is written in the IDL language. Its source code can be found in the file ```
funct.pro
```

in the ```
lib
```

subdirectory of the IDL distribution.