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  1. rmix22

    help with undefined variable

    Two errors: 1) When you defined R you used "R." as variable name (note the dot), so you have to use this name also in your equation. 2) Your guess values for K1 and K2 are missing the unit volt
  2. rmix22

    Trilinear interpolation in mathcad prime?

    That kind of interpolation of a tabled "function" in three independent variables was posted a few times in the native Mathcad forum at PTC https://community.ptc.com/t5/Mathcad/bd-p/PTCMathcad It can be done using linear interpolation as well as cubic spline interpolation and the tabled data has...
  3. rmix22

    Ceiling for numbers with unit

    Use scale:=1/mm instead of scale:=m/mm Remark: I am not sure if Mathcad 2000 already provided the built-in fuction "Ceil" (note the capital C). If its available in your version you can use it like "Ceil(18.2 mm, mm)=...mm" If not you may define your own: Ceil(a,b):=ceil(a/b)*b
  4. rmix22

    Mathcad15 - If statement false - > previously defined variable deleted or overwritten with 0

    The most natural approach IMHO is this: Sorry - the huge pic size is due to making the screenshot from a 4K display on a rather small notebook display with a rather large windows scale set. Other forum software would allow for resizing but I found no way to do that here. Am I missing something...
  5. rmix22

    Range problem...

    I agree with IRStuff that this smells like homework and this is not the right place to ask for homeworks help. You sure will find places where homework help is offered but when you go there, there are some points to consider. First in most of those places you have to show that you did something...
  6. rmix22

    Range problem...

    Sorry, but I don't understand what you mean and what you need. I don't have the slightest idea what U, I1, U2 and V should be and what you are after. Please start from scratch: new thread, new sketch (most important, I guess), new explanation and new Mathcad sheet.
  7. rmix22

    Range problem...

    I guess nobody asked for the whole, huge project being explained. The problem was that you supplied a wrong drawing and the problem of your question was insufficient specified and would have required closer specifications. Does your answer mean that the table I provide was not what you were...
  8. rmix22

    Range problem...

    @IRstuff: You (like me) got confused as of bx vs. xb. So we can vary both x and the angle and create a table of values very easily (Area(x,phi):=x^2/(2*tan(phi))) but some of the values in the table are invalid as the line would cross the top line more than b away from the upper right corner...
  9. rmix22

    Range problem...

    Your task sure needs some clarifications: [ol 1] Your picture is wrong! Either the position of phi is wrong or it should be bx=x/tan(phi)!! How should it be? Can you provide a correct drawing with all used variables (x,xb,bx,phi and possible an a,too, to fully dimension the rectangle What...
  10. rmix22

    Range problem...

    You'd better use vectors instead of range variables. You should use ranges only for three reasons: [ol 1] use a range to index matrix/vector elements use a range in a program for-loop use a range on the abscissa of a xy-xplot [/ol] As tempting as it may be, refrain from using ranges for...
  11. rmix22

    Two equations Two unknowns

    It looks like you made a type in your pic - according to your first post the secon eps.ys should be an eps.ts. I still think that Mathcad will have difficulties in presenting you are closed symbolic solution because of the involved logarithms but it shouldn't be that difficult to (partly)...
  12. rmix22

    Two equations Two unknowns

    Nice pic but still no worksheet. You have to solve for both variables at the same time, but I am not sure if Mathcad will be able to provide a symbolic solution.
  13. rmix22

    Range problem...

    The help is pretty much the same in MC14 and MC15. If you go to Help/Vectors and Matrices/Calculating with arrays (which basically is what you are doing) you find a link to the vectorization operator and also a link to the Vector & Matrices Tutorial. At the end of that tutorial you find as an...
  14. rmix22

    Range problem...

    Here is the answer to your second question. I can only second IRstuff's advice to study the help (which BTW is really good in MC15 and below with all its examples, quicksheets, etc.) as vectorization and built-in functions like match() and lookup() are quite standard when dealing with vectors...
  15. rmix22

    Two equations Two unknowns

    So as you are looking for a symbolic solution of your system of two equations, you will have to use Mathcad's symbolics. You can either user the symbolic solve command (you provide the two equations in a 2x1 matrix) or as an alternative you can use a solve block with find() which you evaluate...
  16. rmix22

    Two equations Two unknowns

    It seems you are looking for symbolic evaluations. You will have to attach your sheet to show what you really need and want to achieve.
  17. rmix22

    Minimize function

    I guess the Round() function (note the capital R) will do the job. Round(length_in_any_unit, 1/8 in)=
  18. rmix22

    Minimize function

    The effect is easily explained. Thats because your Uratio never changes. You made it a function of the four variables, but those arguments never are used in the calculation. Give it a try - call Uratio with different arguments and you will always get the same result. That way you can't demand...
  19. rmix22

    Minimize function

    ad Minimize: You have to provide units in your fours constraints to make it work --> 12in<d<48in, etc. ad Case determination: You sure have to check your syntax! You can't write if (x="one" OR "two" OR "five") but you must write if (x="one" OR x="two" OR x="five") Furthermore you must check...
  20. rmix22

    Mathematical Error or Units

    Interestingly - really? Thats exactly what I would have supposed. As IRSTuff already wrote, Mathcad will not make that kind of calculation errors. We don't know why mohammed43 thinks that the result should be different. Either he is referring to a result given to him by somebody else or he...

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