what is usage of due variable in amortize function?(amortize of a financial tool box)

i can't understand usage of due in amortize function

Answer 1

[Geoff Hayes]

xorso - according to the documentation for amortize, due is an optional argument to the amortize function that indicates when payments are due - either at the end of the period (i.e. end of the month) or at the beginning of the period (i.e. first day of the month). The default is the end of the period. If you alternate between the two values, you will notice a change in at least the output principal (that which must be paid in each period).

[xosro]

thank you about your answer what is the cash flow associate with due=1?