problem with "Maximum variable size allowed by the program is exceeded."

ss4=double(zeros(1:l,1:m));

ss4(x,y)=data1(x,y);

??? Maximum variable size allowed by the program is exceeded.

Error in ==> mycodeversion3 at 57
ss4(x,y)=data1(x,y);

where x =<85958x1 double>
y =<85958x1 double>