CODEWITHSUNDEEP
matlabnumericalintegral
chi86
chi86

Reputation: 181

multiple integrals in the same variable in MATLAB

I need to evaluate the following integral in MATLAB (numerically): enter image description here

I already tried various things but I can't figure out how to solve this! Following is my last try:

Fdx = @(x) integral(@(y)1./(1+sqrt(y.^2))*(1-pi^2),0,x);
dFdx(1)
F = 8 * integral(dFdx,0,10)

As a result MATLAB gives me this error message:

Error using integral (line 85) A and B must be floating-point scalars.

Error in @(x)integral(@(y)1./(1+sqrt(y.^2))*(1-pi^2),0,x)

Error in integralCalc/iterateScalarValued (line 314) fx = FUN(t);

Error in integralCalc/vadapt (line 132) [q,errbnd] = iterateScalarValued(u,tinterval,pathlen);

Error in integralCalc (line 75) [q,errbnd] = vadapt(@AtoBInvTransform,interval);

Error in integral (line 88) Q = integralCalc(fun,a,b,opstruct);

Error in test (line 7) F=8 * integral(dFdx,0,10)

Upvotes: 0

Views: 423

Answers (1)

Seba Arriagada
Seba Arriagada

Reputation: 380

Try using integral2 instead. See example 2 in the documentation:

http://www.mathworks.com/help/matlab/ref/integral2.html

Hope it helps.

Upvotes: 2

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