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KarlBogha14-Alexandrite
14-Alexandrite
November 26, 2013
Question

polar to rectangular conversion in mathcad PRIME?

  • November 26, 2013
  • 3 replies
  • 9637 views

HELLO ALL, I AM SHOCKED THAT PRIME 2.0 DOES NOT HAVE A POLAR TO RECTANGULAR CONVERSION, BOTH WAYS.

I HAD TIRED TO FIND A WAY OR A FUNCTION, TRIED THE DISCUSSIONS COULD NOT FIND A SOLUTION.

MY HP ENGINEERING CALCULATOR DOES CONVERSIONS FROM POLAR TORECT, AND RECT TO POLAR.

i DONT KNOW WHY THIS WAS NOT ADDRESSED BY MATHCAD.

ANYONE HAS A METHOD OF DOING THIS? THANKS.

I AM NEW IN MATHCAD AND STARTED WITH PRIME.

ITS OF NO USE IF I HAVE TO RESORT TO A CALCULATOR.

I READ A NUMBER OF POSTS GOING BACK A FEW YEARS YET NO SOLUTION. STRANGE. MAYBE INDUSTRY HAS A DEAL ON WHO CAN AND CANNOT HAVE THE CONVERSION. MEANT PRIMARILY FOR ELECT. ENG. HOPE I GET HELP ON THIS ASAP.

THANKS.

3 replies

A
AndyWesterman12-Amethyst
12-Amethyst
November 26, 2013

Hi,

What conversion functions do you need, most should be available through the standard operators & functions.

Regards

Andy

W
Werner_E25-Diamond I
25-Diamond I
November 26, 2013

No need to shout (uppercase)!

Whats the problem - you have a square root, a multiplication, a square, function atan2() and sin() and cos().

Whats the problem in creating the functions you are missing.

Her are two ways to do so. I chose single values as input and a column vector as output.

polrec.png

    K
    KarlBogha14-AlexandriteAuthor
    14-Alexandrite
    November 27, 2013

    Werner the reply you provided was helpful but it does not do the job!

    I need Prime to have a function like cos(x), so that i can use it anywhere in the calculation steps.

    The method you provided is helpful but is not workable on calculation sheets where we apply rect to polar, then polar to rect, and it goes on till the calcs are completed.

    There is the magnitude | | and the arg (argument) functions which can be used, but to apply the conveersion finction directly means not having to associate it to a dummy variable. Too much back and forth.

    Honestly it is a serious problem since Mathcad does not see this needy function.

    I dont know if earlier Mathcad versions had the polar-rect conversion function.

    HP calculators have it on the scientific calculators used by engineering students and engineers.

    You should check into this could be Mathcad just missed out.

    The solution you provided is helpful but I am sorry we need a function. Thanks.

    W
    Werner_E25-Diamond I
    25-Diamond I
    November 27, 2013

    I just noticed that you placed this question in "Electrical Engineering" so I guess your question may be dealing with complex variables anyway!? You would need the Rec<-->Pol function for your calculation with a normal calculator, but Mathcad can deal with complex variables so you won't need any conversion function at all:

    27.11.png

    K
    KarlBogha14-AlexandriteAuthor
    14-Alexandrite
    December 1, 2013

    Werner and Alan the replies provided by you had been helpful, I got a chance today, Sunday, to try the solutions provided by you. I started of with difficulty in this due to my group had people working with Mathcad, and I was working in Prime, and I heard this that and the other, and it led me to understand it all as the other!

    I got down and tried it out and I remembered I had gone through this before partially until where i stopped.

    Why is it Prime returns the answer for complex numbers in j and accepts the variable in format i?

    Can I have it both ways j for elecrical engineering since its not confused with current variable i?

    Meaning enter j for complex number's imaginary part?

    My progress is attached. Not Over Yet since I got to do some complex calculations with these will request

    further help. Thanks.

    P2R+and+R2P.png

    W
    Werner_E25-Diamond I
    25-Diamond I
    December 1, 2013

    So you are dealing with complex numbers as I guessed.

    As I see it you won't need any pol2rec/rec2pol functions anyway and you may use j instead of i when assigning a variable, too - I used it that way here: http://communities.ptc.com/message/227548#227548!

    Also you won't need to write new functions to get the argument in degree. As was also shown in the thread mentioned above you can use the degree sign (or type deg) for input and output as well.

    When assigning an angle in degre you may either type deg after the value or type the degree symbol from the keyboard

    When showing an evaluation you may either type deg in the space after the displayed value (which will be in rad by default) or you insert the dgree sign from the unit menu (typing it from the keyboard won't work on contrary to Matchcad 15 and below).

    So there is no need to do the conversion as in your screenshot.

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