diagonal matrix

Hi,
 
I have a question, I am not able to a construct diagonal matrix without
passing four parameters to the matrix
 
typedef matrix<double,  diagonal<>, dense<>, row_major>::type
DDMATRIX;
 
DDMATRIX Matrix= DDMATRIX(rows, cols,0,0);
 
If I do not add the last two parameters the compiler VC++ 6 does not
compile. I just like to use the first two parameters to keep the code
consistent if possible, any suggestions?
 
 
Yasser

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