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**Didi UMD** Thanks for taking time to help me with this CaptainBlack! As for the questions, yes I have declared x1 x2 and x3 to be symbolic variables (syms x1 x2 x3). Moreover, I am aware that there is no closed form solution for such integral and therefore I thought that Matlab would approximate it numerically itself. So, is there some other function in Matlab I should call in order to estimate the solution numerically? Many thanks!

Try:

Code:

eval(int(int(int(f,x3,0,5-x1-x2),x2,0,5-x1),x1,0,5))

CB