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What steps will reproduce the problem?
1. comment out #define SINGLE_PRECISION 
2. compile in Visual Studio 2008

Error: windef.h has the same repeated definition
typedef float FLOAT is defined in windef.h, so 
typedef double FLOAT fails to compile

Also,are intrinsic math functions, such as __cosf (), only available in 
single-precision? 

These two lines in 'read_file_mco.m' has the same error

115: refl_ra = reshape(refl_ra,step_num(2),step_num(3));
122: trans_ra = reshape(trans_ra,step_num(2),step_num(3));

where 
step_num(2) = nr 
step_num(3) = na (as from gpumcml_io.c)

Array elements refl_ra[r,a] and trans_ra[r,a] in an output file are printed as 
[nr,na]=[0,0], [0,1], [0,2], etc., so in order to reshape them we should write
  reshape(refl_ra,na,nr)
and transpose the result:

115: refl_ra = reshape(refl_ra,step_num(3),step_num(2))';
122: trans_ra = reshape(trans_ra,step_num(3),step_num(2))';