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alanmardan1-Visitor
1-Visitor
March 25, 2011
Solved

problem with my units

  • March 25, 2011
  • 20 replies
  • 12600 views

Dear all,

I have problems with different things on my Mathcad15.

1. when i create equations based on defined variables, the units are not as expected when i enter the unit i want to be as my result unit.

2. when i go to help search, the menu is disabled and only numbers appear insted. but when i press the numbers i get a message that i could have problem with active ontroll function.

3. how can i get the my result from an equation as unitless? the variables are defined with units above

i really need help with this as i have to submitt my course work very soon.

regards

Alan Mardan

Best answer by ValeryOchkov

I would like to show you that you change the value of the variable m and later use mot meter (m) but you user variable m that is mot yet meter.

20 replies

ValeryOchkov24-Ruby IV
24-Ruby IV
March 26, 2011

Attach please the file!

alanmardan1-VisitorAuthor
1-Visitor
March 26, 2011

Hi Valery, thanks for the respond

I have highlighted some of the equations and explained what unit i want the results to have. the two main problems are:

1. I can not get a unitless result using my defined variabes which have units

2. some of my equations give me units in kg per something, but all my units are based on either kN/m, kN, m, mm and kNm (For civil engineering)

sorry if my calcs are messy but tried to highlight some of the problems in yellow

looking to hearing from you

Thanks

Alan

    ValeryOchkov24-Ruby IV
    24-Ruby IV
    March 26, 2011

    Do not change values of variables m, N etc. They are units - meter, newton etc

    See my red operators in the attached file!

    This promlem is solved in Mathcad Prime!

    PhilipOakley1-Visitor
    1-Visitor
    March 26, 2011

    Given your point 2. I would suggest that you have an installation problem.

    If you open the tutoriuals at one of the units examples, does it give the same problem. Use the address toolbar in the resource centre window to find its true location, and then open directly in the main mathcad to avoid differences between the resource centre execution and user sheet execution.

    Good luck.

    Philip

    alanmardan1-VisitorAuthor
    1-Visitor
    March 27, 2011

    Hi philips,

    I had a virus on my computer and started to remove things from internet explorer as the virus stopped my antivirus from workin. So i removed things from explorer and i think some thing wrong went in between there.

    regards

    Alan

    mzeftel1-Visitor
    1-Visitor
    March 28, 2011

    Alan,

    Go to add/remove programs and repair Mathcad. That should help if you accidentally uninstalled something.

    Mona

    SamuelCrabtree1-Visitor
    1-Visitor
    May 19, 2011

    I'm also having a problem with units.I am solving two equations with two unknowns symbolically. The results come out looking like this:

    -(15 digit number) x lb x -(15 digit number) x ft^2 + (15 digit number) x in^2

    ft^2

    If I then copy that complicated expression and type '=' after it mathcad does the reduction and puts out the correct answer, in pounds, to four significant figures like I have directed. But why doesn't mathcad reduce all those ft and in and come out with the correct answer directly?

    ValeryOchkov24-Ruby IV
    24-Ruby IV
    May 19, 2011

    The symbol Math of Mathcad does not Know what it is units - 100 cm=1m 1000 gm=1kg etc.

    Send your sheet and we will try to help you.

    SamuelCrabtree1-Visitor
    1-Visitor
    May 19, 2011

    I think I now understand.But in case you can show me a better way to solve simultaneous equations I have attached my entire worksheet. I have had the same thing happen on page 2 twice, and page 3 once. In the "(15 digit number)" in my original post the "15" was only approximate.

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