[Rd] Matrix memory layout R vs. C

[Luis Carvalho]

> And to be safer on a 64-bit platform
> 
> #define INDEX(i,j) ((i) + rows*(R_xlen_t)(j))
> 
> since rows*j might overflow there.

Shouldn't 'rows' be also a parameter?

#define INDEX(rows,i,j) ((i) + (rows)*((R_xlen_t)(j)))

Cheers,
Luis

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Luis Carvalho (Kozure)
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