How to convert function with elliptic integrals containing symbolic variables to that which contain numerical values?

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dayu 2018-10-11

评论： Torsten 2018-10-22

 syms x a
f=(1/sqrt(x*((x^2)-a)))
d=(int(f))

f =

1/(-x*(- x^2 + a))^(1/2)

d =

-(2*a^(1/2)*(-x/a^(1/2))^(1/2)*ellipticF(asin((-x/a^(1/2))^(1/2)), -1)*(1 - x/a^(1/2))^(1/2)*(x/a^(1/2) + 1)^(1/2))/(x^3 - a*x)^(1/2)

How shall I give values to x and a as vectors? I need to plot the function for certain values.

Torsten 2018-10-11

编辑：Torsten 2018-10-11

d_num = matlabFunction(d);
d_num(1,3)

dayu 2018-10-22

Sir, what does 1 and 3 represents? values for x and a? I am getting a result with complex number. But I want real number. What shall I do?

Torsten 2018-10-22

Choose x >= sqrt(a) for the interval where you want to integrate the function.

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