How to Concatenate the result in for loop?

Hello every one

I'm very new in matlab

I have some problem how do i concatenate the result from for loop?

for i=0:bond(860)          %bond is the data table include 861*36 table of number
    a=[bond(i+1,:)];
    B=[repmat(a(1),[length(nonzeros(a))-1 1]) nonzeros(a(2:end)')];
end    
                                            

the result is

B =

16×2 uint32 matrix

860 796

860 797

860 798

860 816

860 817

860 818

860 819

860 836

860 837

860 838

860 839

860 840

860 857

860 858

860 859

860 861

B =

12×2 uint32 matrix

861 797

861 798

861 817

861 818

861 819

861 837

861 838

861 839

861 840

861 858

861 859

861 860

This is a few result it have number 1 - 861

it show just the lastest result in B table

I want to get all result since 1 to 861 in the same arrey (concatenate all result in one table), want all result in B table not only the lastest calculation