Visible to Intel only — GUID: GUID-7D137664-6F3E-4832-BEDD-39EAF5AE9F52
Visible to Intel only — GUID: GUID-7D137664-6F3E-4832-BEDD-39EAF5AE9F52
?lamch
Determines machine parameters for floating-point arithmetic.
Syntax
val = slamch( cmach )
val = dlamch( cmach )
Include Files
- mkl.fi
Description
The function ?lamch determines single precision and double precision machine parameters.
Input Parameters
- cmach
-
CHARACTER*1. Specifies the value to be returned by ?lamch:
= 'E' or 'e', val = eps
= 'S' or 's', val = sfmin
= 'B' or 'b', val = base
= 'P' or 'p', val = eps*base
= 'n' or 'n', val = t
= 'R' or 'r', val = rnd
= 'M' or 'm', val = emin
= 'U' or 'u', val = rmin
= 'L' or 'l', val = emax
= 'O' or 'o', val = rmax
where
eps = relative machine precision;
sfmin = safe minimum, such that 1/sfmin does not overflow;
base = base of the machine;
prec = eps*base;
t = number of (base) digits in the mantissa;
rnd = 1.0 when rounding occurs in addition, 0.0 otherwise;
emin = minimum exponent before (gradual) underflow;
rmin = underflow_threshold - base**(emin-1);
emax = largest exponent before overflow;
rmax = overflow_threshold - (base**emax)*(1-eps).
NOTE:You can use a character string for cmach instead of a single character in order to make your code more readable. The first character of the string determines the value to be returned. For example, 'Precision' is interpreted as 'p'.
Output Parameters
- val
-
REAL for slamch
DOUBLE PRECISION for dlamch
Value returned by the function.