Double integration with trapz
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Hi everyone! I'm new in matlab,and I'd like using from trapz for solve this equation: exp(r1.*r2)over on the r1 and r2; but I couldn't, for solve this double integration, I expanded exp(r1.*r2) and got the solution but because of I am trying to simulation a laser cavity, that solution is not more exact. so I am hope solve this double integral and I need help. please help me. N=256; a=10e-6; r1=-N/2*a:a:(N/2-1)*a; r2=r1; [R1 R2]=meshgrid(r1,r2)
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Jeremy Kemmerer
2014년 10월 2일
It sounds like you are trying to perform numerical double integration. Have you tried using the function “integral2”?
Here’s how you might do that for your example:
>>fun = @(x,y) exp(x.*y); //handle to function to be integrated
>>llim = -N/2*a; //define limits of integration
>>ulim = (N/2-1)*a;
>>q = integral2(fun,llim,ulim,llim,ulim);
Please refer to the following documentation for more information about the “integral2” function: http://www.mathworks.com/help/matlab/ref/integral2.html
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