how to find the ansers for an elliptic integral.
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Prashanth Chandrasekar
on 3 Feb 2014
Commented: Walter Roberson
on 3 Feb 2014
I am prashanth doing a project using matlab.I am new to matlab.I want to know how to interpret an elliptic integral and how to solve an elliptic integral in matlab. My equation is as follows.
Input: syms a b phi
int((1/(sqrt(1-(((2*b)/(a+b))^2)*(sin((pi/4)-(phi/2))^2)))), phi)
Ans:(-2)*ellipticF(pi/4 - phi/2, (4*b^2)/(a + b)^2)
I want to know how the answer has to be interpreted and use in the following steps.
Thanx in advance.
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Accepted Answer
Walter Roberson
on 3 Feb 2014
You need to subs() particular values for "a" and "b" and "phi" into the answer before the value of the elliptic integral can be calculated. For example,
double( subs(Ans, {a, b, phi}, {3, 4, pi/3}) )
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Walter Roberson
on 3 Feb 2014
EIAns = matlabFunction( subs(Ans, {a, b}, {3, 4}) ); %use appropriate a b
EI_equals = 0.3183; %whatever you need the integral to come out as if you had the correct phi
rightphi = fzero( @(phi) EIAns(phi) - EI_equals, [0 2*pi]);
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