ndata=load(file name)
ndata=[zeros(1,size(ndata,2); ndata]; % prepend row of zeros
time=indata( : , 1);
...
Note the use of zeros() and size(ndata) -- this will be consistent w/ a different number of columns in the input file if that were to change rather than just writing
ndata=[[0 0 0]; ndata]; % prepend row of zeros
or using a hardcoded '3' in the zeros() argument.