Double Integral numerically in matlab

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Brittany
Brittany 2014-12-9
I am trying to solve a double integral using quadgk. t and r are values that can change so I have created a function where they are inputs.
function BF = calcBF(t, r)
B = @(x,y)(t-x-y)*(3)/(3+4*(x+y)+4*x*y)*sqrt(3)/(sqrt(3+4*(x+y))/r+(4*x*y/r.^2))
firstint = @(x)quadgk(@(y) B(x,y),0,t-x)
secondint = quadgk(@(x) firstint, 0, t)
BF = 6*secondint;
Each time I run the code however, I receive an error that "Supported classes are 'double' and 'single'" I'm sure I'm denoting something wrong within the code; however, I don't see it.

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