# why is the range( 1, t_intervals + 1)

In MC: Forecasting Stock Prices, the loop uses for t in range( 1, t_intervals)

However, in MC:Euler Discretization, the loop uses for t in range( 1, t_intervals +1 )

Why do we have to add +1 for Euler and not for Stock Pricing?

It might be a mistake because the size of the array under Euler's method is 25-1 rows * 10000columns

Hi Ryan and Santiago!

Thanks for reaching out.

Please accept my apology for the delayed response.

It is just a matter of representation, nothing really important. It depends how many steps do you want to have randomized.

In the "Stock Prices" lecture, we did not add 1 and we referred to the formulas as shown in the video and in the lecture file. This is why the last iterated stock price is t + 999, which means you will have generated 1,000 steps.

In the "Euler" lecture, we add one, so that you don't obtain just t + 249, but t + 250.

That's all... What is important is to stick either to one or to the other.

Regarding Euler, we use `t_intervals = 250`

, and later we use `Z = np.random.standard_normal((t_intervals + 1, iterations))`

.

Please don't confuse this with obtaining 251L as a length of the S matrix.

Hope this helps.

Kind regards,

Martin