The underlying math library in calculator++ correctly returns complex numbers for $\ln(x)$, where $x<0$. For example,
$$\ln(-5) = \ln(5) + \pi i$$
However, the graphing part ignores complex numbers and so the graph is displayed as symmetric, $\ln(-x) = \ln(x)$, which is incorrect.
While this could be fixed by resolving issue #210, a simpler solution is to treat all numbers where the complex part is not zero as undefined, which is the traditional way logarithms were handled mathematically.
The underlying math library in calculator++ correctly returns complex numbers for$\ln(x)$ , where $x<0$ . For example,
However, the graphing part ignores complex numbers and so the graph is displayed as symmetric,$\ln(-x) = \ln(x)$ , which is incorrect.
While this could be fixed by resolving issue #210, a simpler solution is to treat all numbers where the complex part is not zero as undefined, which is the traditional way logarithms were handled mathematically.