各位MATLAB大神求助啊

x1=[117711,126374,116842,135921,163821,128426];
x2=[57570,58741,58516,72544,105611,93911];
x3=[75797,79937,75676,78802 ,61255];
x4=[25107,16778,19384,38460,55278,59458];
y=[27615, 281831,254140,322601,403511,343050];
x=[ones(length(x1),1)x1' x2' x3' x4'];
y1=y';
[b,bnt,r,rint,stats]=regress(y1,x)
??? x=[ones(length(x1),1)x1' x2' x3' x4'];
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Error: Missing MATLAB operator.