ARM VERSION 1.2 Fiche technique télécharger pdf (Page 225)

Floating-point Support

5.4.9 Return the exponent of a number (ilogb)

int ilogb(double x);

This function returns the exponent of

, without any bias, so

ilogb(1.0)

would return 0,

and

ilogb(2.0)

would return 1, and so on.

When applied to 0,

ilogb

returns

-0x7FFFFFFF

. When applied to a NaN or an infinity,

ilogb

returns

+0x7FFFFFFF

ilogb

causes no exceptions or errors.

5.4.10 Determine if a number is a NaN (isnan)

int isnan(double x);

This function returns 1 if

is a NaN, and 0 otherwise. It causes no exceptions or errors.

5.4.11 Bessel functions of the first kind (j0, j1, jn)

double j0(double x);

double j1(double x);

double jn(int n, double x);

These functions compute Bessel functions of the first kind.

and

compute the

functions of order 0 and 1 respectively.

computes the function of order

If the absolute value of

exceeds π times 2

, these functions return an

ERANGE

error,

denoting total loss of significance in the result.

5.4.12 The logarithm of the gamma function (lgamma, lgamma_r)

double lgamma(double x);

double lgamma_r(double x, int *sign);

These functions compute the logarithm of the absolute value of the gamma function of

x. The sign of the function is returned separately, so that the two can be used to compute

the actual gamma function of x.

lgamma

returns the sign of the gamma function of x in the global variable

signgam

lgamma_r

returns it in a user variable, whose address is passed in the

sign

parameter. The

value, in either case, is either +1 or –1.

Both functions return an

ERANGE

error if the answer is too big to fit in a

double

Both functions return an

EDOM

error if x is zero or a negative integer.

1 2 ... 220 221 222 223 224 225 226 227 228 229 230 ... 275 276

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Midland radio GXT850 Manuale Utente (28 pagine)

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X-TRA TALK

TABLE OF CONTENTS 3

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CONTROLS

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USING THE RADIO IN GROUP MODE

TROUBLESHOOTING GUIDE

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Model GXT800/808/850 Series

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