How to Create A Loop to Calculate a Cummulative Variable

[ptc-5031264]

I am new to Mathcad and I am having a problem with programming a simple loop. In the attached mathcad sheet I want to calculate the value of (q) and then I want it to add to (s) and then re-calculate (q) for the new (s) value. However, I am unable to do this using the programming function as shown in the Mathcad sheet. It seems to give the same answer through the loop. Please help. Thank you.

[AndyWesterman]

just need to move the summing line inside the for loop.

Regards

Andy

[Werner_E]

The attached examples of two different ways should help

[ptc-5031264]

Many thanks for the answer. It was very helpful. I got another question on how I could return the values of both s and q in the mathcad sheet. Thank you.

[Werner_E]

Ranjan Nadarajah wrote:

Many thanks for the answer. It was very helpful. I got another question on how I could return the values of both s and q in the mathcad sheet. Thank you.

Are you interested only in the last value of the iterations of both of them or do you need the whole "history"?

Said another way - do you want vectors for s and q or rather a single value (from the last iteration)?

[Werner_E]

I think one of the two attached methods should do the job