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  1. NicolasPan

    Find the electric field of a uniformly polarized sphere

    About the \cos\theta' I have found from another post the following explanation:It states that it is used because we care about the Z components only ,but I don't quite get it.Thanks a lot ! :)
  2. NicolasPan

    Find the electric field of a uniformly polarized sphere

    Thank you for your time Sir.Although I would like to know if this can be solved with my method of integration and specifically I would really appreciate it If my first question was answered.My kind regards
  3. NicolasPan

    Find the electric field of a uniformly polarized sphere

    Homework Statement We want to calculate the field of a uniformly polarized sphere of radius=R Homework Equations V(\vec{r}) = \frac{1}{4 \pi\epsilon_{0}} \oint_{S} \frac{\sigma_{b}}{r} da' + \int_{V} \frac{\rho_{b}}{r} d\tau' The Attempt at a Solution i)I know that \sigma_{b} = P...
  4. NicolasPan

    Engineering related publication

    Hello everyone,I am a mechanical engineering student and yesterday I convinced my professor to work on a project where it will be published in a journal about one year from now.I really don't know where to start as there are countless of highy-respected researches at top universities such as...
  5. NicolasPan

    Fortran Fortran 90/95 function

    Hello everyone! I've been wondering if it is possible in Fortran to 'read' a function.For instance when I code this: contains function f(x) double precision :: f double precision ::x f=(whatever the function) return end function end program It would be ideal if the program allowed...
  6. NicolasPan

    Difference between Taylor Series and Taylor Polynomials?

    Thank you! Simple and clear explanation
  7. NicolasPan

    Difference between Taylor Series and Taylor Polynomials?

    Hello,I've been reading my calculus book,and I can't tell the difference between a Taylor Series and a Taylor Polynomial.Is there really any difference? Thanks in advance
  8. NicolasPan

    Comp Sci Error while calculating arc length of curve in Fortran

    Thank you for your answers!! I will be using your advice for sure in my code and see how it goes
  9. NicolasPan

    Comp Sci Error while calculating arc length of curve in Fortran

    I am aware of that,although that can't be the problem the bigger the n the more my sum goes up.And the problem states that it should be able to work with just n=20,which doesn't in my case.Therefore I assume the problem is associated with my code.Nevermind thanks for your suggestion
  10. NicolasPan

    Comp Sci Error while calculating arc length of curve in Fortran

    Well I think the curve's x's from x1 to x2 can be divided to 20 equidistant x's with every n to be used to get to the next x.Xn=abs(x2-x1)*x/20 and X(n-1)=(x-1)*(abs(x2-x1)/20).Therefore if I subtract Xn,X(n-1),I will be getting the distance between consecutive X's.
  11. NicolasPan

    Comp Sci Error while calculating arc length of curve in Fortran

    Well if for x1=0.5 and for x2=1.5 I am getting 104.3853... That can't be right since I've checked it in wolframalpha and it says 13
  12. NicolasPan

    Comp Sci Error while calculating arc length of curve in Fortran

    The program must calculate the length of the curve of ƒ=3.1*x^2-5.3/x between x=1/2 and x=3/2.The legth should be calculated as the sum of n line segments starting with n=1 and ending with n=20. I really can't find why the result I'm getting is wrong.Thanks in advance I am giving you the code...
  13. NicolasPan

    Comp Sci Help with fortran

    Hello everyone ! Thank you very much for your help I really appreciate that! Could you please explain why my factorials are wrong? It's strange since I get correct answers only for some degrees e.x 45 and wrong for many others such as 90 degrees.Thanks in advance
  14. NicolasPan

    Comp Sci Help with fortran

    Hello I was assigned the following problem:Make a Fortran program which will be able to read a degree[0-360] checking validity range(not type) and it will be able to calculate and print the cos(x) from the following equation: cos(x)=1-x^2/2! + x^4/4!-x^6/6!+x^8/8!-...,where x is in radiants.As a...
  15. NicolasPan

    Comp Sci How to break a number into separate digits in Fortran

    Here is line 34 harmonicmean=(5)/((1/div11)+(1/div22)+(1/div33)+(1/div44)+(1/div55))
  16. NicolasPan

    Comp Sci How to break a number into separate digits in Fortran

    Thank you all for your answers I really appreciate that.I have updated the code though the only error it seems have is that in line 34 it occurs a problem that says integer diveded by zero,although I contemplate there is no such division.Is anyone able to spot what's wrong? !this program accepts...
  17. NicolasPan

    Comp Sci How to break a number into separate digits in Fortran

    Mod note: Fixed indents in code below !this program accepts a 5 digit integer !and calculates the harmonic and geometric means of it's digits !the program checks and denies numbers with lenght diffrent than 5 digits !The harmonic mean should be calculated only when !all of the number's digits...
  18. NicolasPan

    Comp Sci Fortran 95 code won't run

    Thank you very much both SteamKing and Mark44 I really appreciate your help!!,and excuse me for not adding tags around my code
  19. NicolasPan

    Comp Sci Fortran 95 code won't run

    Homework Statement . [/B]Hello all !! I am currently trying to make my fortran95 code run in vain.I would really appreciate it if someone could lend my a hand since I am a starter in programming.So the problem goes like that:Create a program capable of calculating the following function...
  20. NicolasPan

    The Function h(x)=e^(2x)-2

    1.a) Dh=ℝ b)The solution can go through this path: (e^x)^2-e^x-2=0 If e^x=y i) then the equation is transformed like that: y^2-y-2=0 then the solutions are y=(1±3)/2 and from i) we get e^x=(1±3)/2 BUT since the function e^x can only give positive results for x∈ℝ the only acceptable solution...
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