How to sum up the results?

Forum|Forum|13 years ago
January 3, 2013
2 replies
4221 views

hi . . my name is Jan

i know very litle about programing. still learning from tutorials. u can call me a beginner.

now i need to sum results

Could anyone help, please.

The attached file is an explanation of everything.

I'm using Mathcad 15.

1_helpSum-xmcd.zip

Other

Best answer by Werner_E

1) You did not cycle from 0..N but simply calculated W for N=2. That way W only gets the value for N=2 ((18))

Solution: Write a prog which cycles from 0 to N calculates the values and append them to the vector W

2) Even then you could not use the sum symbol you tried as this only sums up vectors consisting of numbers. What your calculation of W produces is a nested vector.

Solution: change all calls to "pick(......)" to "pick(.....)[0" and you get a vector of the numbers you want which you can sum as you had tried.

comment: I think whatever you sheet should do could possibly be done less complicated. At least on first sight it looks like the combinaton of "match" and "pick" could be replaced by a simple use "lookup" - but then I may be wrong, so give it a try..

N

Ninetrees

3-Newcomer

I didn't try to figure out what your program is doing, but you are on the right track. The variable W is a single value = 18, and if you sum that, you get 18.

It looks to me as if W will only return a single value.

~R~

W

Werner_E

Answer

25-Diamond I

1) You did not cycle from 0..N but simply calculated W for N=2. That way W only gets the value for N=2 ((18))

Solution: Write a prog which cycles from 0 to N calculates the values and append them to the vector W

2) Even then you could not use the sum symbol you tried as this only sums up vectors consisting of numbers. What your calculation of W produces is a nested vector.

Solution: change all calls to "pick(......)" to "pick(.....)[0" and you get a vector of the numbers you want which you can sum as you had tried.

comment: I think whatever you sheet should do could possibly be done less complicated. At least on first sight it looks like the combinaton of "match" and "pick" could be replaced by a simple use "lookup" - but then I may be wrong, so give it a try..

1_helpSum1-xmcdz.zip