matlab三重积分图,三重积分在积分时一直在运行，无法画图
syms r1 r2 r3 xPath_loss_exponent=3; %los and nlosAntenna_Gain=10^1.8;power=1; %w%power=1000; %mwR=100; %mrd=200; %mNoise_power=10;T=-20:3:20;TT=10.^(0.1*T);%..................................
