how to represent my outcomes from a multinomial distribution in terms of y=1:10

clc
clear all
format compact
rng(970,'v4')
X=[];
X1=[];
X2=[];
X3=[];
U=[];
p =[0.0080 0.0270 0.1250 0.0360 0.0600 0.1350 0.2250 0.0540 0.1500 0.1800];
Y=1:10;
for i = (1:10000)
    r =rand;

     if r<0 & r<=0.0080
           x1=0; x2=0; x3=3;
            Y=1;
         X1=[x1];X2=[x2];X3=[x3];
         U=[U,r];
     else if r>0.0080 & r<=0.0350
             x1=0; x2=3; x3=0;
             Y=2;
             X1=[x1];X2=[x2];X3=[x3];
             U=[U,r];
         else if r>0.0350 & r<=0.1600
                 x1=3; x2=0; x3=0;
                 Y=3;
                 X1=[x1];X2=[x2];X3=[x3];
                 U=[U,r];
             else if r>0.1600 & r<=0.1960
                     x1=0; x2=1; x3=2;
                     Y=4;
                     X1=[x1];X2=[x2];X3=[x3];
                     U=[U,r];
                 else if r>0.1960 & r<=0.2560
                         x1=1; x2=0; x3=2;
                         Y=5;
                         X1=[x1];X2=[x2];X3=[x3];
                         U=[U,r];
                     else if r>0.2560 & r<=0.3910
                             x1=1; x2=2; x3=0;
                             Y=6;
                             X1=[x1];X2=[x2];X3=[x3];
                             U=[U,r];
                         else if r>0.3910 & r<=0.6160
                                 x1=2; x2=1; x3=0;
                                 Y=7;
                                 X1=[x1];X2=[x2];X=[x3];
                                 U=[U,r];
                             else if r>0.6160 & r<=0.6700
                                     x1=0; x2=2; x3=1;
                                     Y=8;
                                     X1=[x1];X2=[x2],X3=[x3];
                                     U=[U,r];
                                 else if r>0.6700 & r<=0.8200
                                         x1=2; x2=0; x3=1;
                                         Y=9;
                                         X1=[x1];X2=[x2],X3=[x3];
                                         U=[U,r];
                                     else if r>0.8200 & r<=1
                                             x1=1; x2=1; x3=1;
                                             Y=10;
                                             X1=[x1];X2=[x2];X3=[x3];
                                             U=[U,r];
                                         end
                                     end
                                 end
                             end
                         end
                     end
                 end
             end
         end
     end
  end