[GenABEL-dev] Float to double conversion in filevector/DatABEL files

[Yurii Aulchenko]

> I tried to dig into the fvlib a bit and it seems that readVariableAs()
> performs a cast based on the data type stored in the fv file. From the
> DatABEL manual I gathered that you can specify a data type for fv files.
> Does someone know how I can read the header of an fv file to check the
> data type used in a give fv file?
>
>
Hope this info may be useful:

index file contains information about dimensions of the data file, data type
used, and columns/rows names

The beginning is (frutil.h)

	unsigned short int type;
	// should change that to long!!!
	unsigned int nelements;
	unsigned int numObservations;
	unsigned int numVariables;
	unsigned int bytesPerRecord;
	unsigned int bitsPerRecord;
	unsigned int namelength;
	unsigned int reserved[RESERVEDSPACE];

then names...

where (const.h)

#define RESERVEDSPACE      5

// internal format data types
#define UNSIGNED_SHORT_INT 1
#define SHORT_INT          2
#define UNSIGNED_INT       3
#define INT                4
#define FLOAT              5
#define DOUBLE             6
#define SIGNED_CHAR        7
#define UNSIGNED_CHAR      8

// number of chars used to keep var/obs names
#define NAMELENGTH        32
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