topic solve block in Mathcad

slove block

drgriffin — Thu, 03 May 2018 19:38:07 GMT

Can anyone see why the attached solve block won't work

slove block

IRstuff — Tue, 30 Mar 2010 07:00:00 GMT

On 3/30/2010 11:19:40 AM, dmg wrote:
>Can anyone see why the
>attached solve block won't
>work

Hello Dr. Griffin,

There appears to be two problems:
> you define m:2 at the top, which messes up the meter unit

> the solve block returns 3 quantities with differing units, and that's not allowed in M14. You'll need to do find(f, Vel/(m/s),Re.number) to get units agreement, and then add the m/s later.

I get 0.017, 1.931 (m/s), and 1.012E7

TTFN,
Eden

slove block

IRstuff — Tue, 30 Mar 2010 07:00:00 GMT

Sorry, forgot to attach the file

TTFN,
Eden

slove block

drgriffin — Tue, 30 Mar 2010 07:00:00 GMT

see my soln

slove block

RichardJ — Tue, 30 Mar 2010 07:00:00 GMT

On 3/30/2010 11:46:50 AM, eden_mei wrote:

>> the solve block returns 3 quantities with >>differing units, and that's not allowed in M14.

It is if you assign the results of the solve block to a vector of variables (unlike in MC11, where you could assign the results to a single variable). But I see dmg has already figured that out.

Richard

solve block

drgriffin — Tue, 30 Mar 2010 07:00:00 GMT

If you look at the original file I submitted it was in the correct form, a vector was used to hold soln variables, however it does not work. The useless error message hints at a units problem but I do not see one.

solve block

TomGutman — Tue, 30 Mar 2010 07:00:00 GMT

Eden identitified the problem for you first file in his original post -- you define the variable m, and subsequently try to use m to represent the meter unit. You can't do that, unless you use math styles to distinguish the different usages.
__________________
� � � � Tom Gutman

solve block

drgriffin — Tue, 30 Mar 2010 07:00:00 GMT

yep, I figured that might be it but could not spot the problem. Thanks