Two general formulae for many functions
This section is optional since it is quite complex in terms of mathematical expression. Skipping this section would not have any impact on the understanding of the other chapters. Thus, this section is for advanced learners. Up to now in this chapter, we have learnt the usage of several functions, such as
rate() included in the SciPy module or
numpy.lib.financial submodule. The first general formula is related to the present value:
On the right-hand side of the preceding equation, the first one is the present value of one future cash flow, while the second part is the present ...
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