Double integration with trapz

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Habib
Habib am 2 Okt. 2014
Kommentiert: Habib am 2 Okt. 2014
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)

Antworten (1)

Jeremy Kemmerer
Jeremy Kemmerer am 2 Okt. 2014
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
  1 Kommentar
Habib
Habib am 2 Okt. 2014
thank you for your reply. I want use from trapz command because its solutions are more exact than the solutions of integral2 command. so how can I do it with trapz command?

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