topic Re: which of the solutions is right? in Mathcad

which of the solutions is right?

EN_9902818 — Tue, 24 Aug 2021 10:40:24 GMT

Hi,

I'm trying to find a variable and I've tried three ways of doing this. Please see attached.

I used an If statement and then put it in a program. Unfortunately, I can't see what is the difference among these 3 but I get different results. My preferred option is the program but I can't find why it is wrong..

Could you please check:)

thanks,

Re: which of the solutions is right?

StuartBruff — Tue, 24 Aug 2021 11:14:24 GMT

@EN_9902818 wrote:

Hi,

I'm trying to find a variable and I've tried three ways of doing this. Please see attached.

I used an If statement and then put it in a program. Unfortunately, I can't see what is the difference among these 3 but I get different results. My preferred option is the program but I can't find why it is wrong..

Could you please check:)

thanks,

Your last option doesn't work because it returns the error message, and you've pre-added kPa in the evaluation operator units placeholder ... and strings don't take units. I suggest that in cases such as Option 3, you put the units in the return expression.

Stuart

Re: which of the solutions is right?

StuartBruff — Tue, 24 Aug 2021 11:28:56 GMT

Try the attached ...

Re: which of the solutions is right?

EN_9902818 — Tue, 24 Aug 2021 11:44:06 GMT

Thank you very much!!!

Re: which of the solutions is right?

Fred_Kohlhepp — Tue, 24 Aug 2021 12:19:26 GMT

Attached is a file that demonstrates the power and usefulness of vectorizing.

Method 1 is correct.

Method 2 is wrong because it carries the index (i) inside the program while it's still on V_Ed.red. If you eliminate the index on that I believe Method 2 should work. (With only Express, I an't try.)

Method 3 fails because the units on the text message don't match the units of the calculation. (Texts don't have units.)

Re: which of the solutions is right?

EN_9902818 — Tue, 24 Aug 2021 15:39:07 GMT

Hi,

Thank you very much. This is very helpful.

Cheers,