logarithms PACKAGE MATH_REAL

[create]

Hello,
there are two functions for logarithms in PACKAGE MATH_REAL:

function LOG (X : real ) return real;
-- returns natural logarithm of X; X > 0

function LOG (BASE: positive; X : real) return real;
-- returns logarithm base BASE of X; X > 0In my project i used
first:constant CONST_LOG_NUMBER_SAMPLES : Natural :=
Natural(ceil(LOG(realCONST_NUMBER_SAMPLES))));
and it is correct.But I can not make second version:constant
CONST_LOG_NUMBER_SAMPLES : Natural :=
Natural(ceil(LOG(2,real(CONST_NUMBER_SAMPLES))));ORconstant
CONST_LOG_NUMBER_SAMPLES : Natural :=
Natural(ceil(LOG(real(2),real(CONST_NUMBER_SAMPLES))));How should I write
LOG with base = 2?Thanks,Create

 

[KJ]

"create" <paraliczb@NO_SPAM_orange.pl> wrote in message
news:fnlq2p$9kr$1@inews.gazeta.pl...

Hello,
there are two functions for logarithms in PACKAGE MATH_REAL:

function LOG (X : real ) return real;
-- returns natural logarithm of X; X > 0

function LOG (BASE: positive; X : real) return real;
-- returns logarithm base BASE of X; X

Here are the log functions prototypes from math_real....note, 'base' is not
a positive, it's real.
function log (x : in real ) return real;
function log2 (x : in real ) return real;
function log10 (x : in real ) return real;
function log (x: in real; base: in real) return real;

In my project i used first:constant CONST_LOG_NUMBER_SAMPLES : Natural :=
Natural(ceil(LOG(realCONST_NUMBER_SAMPLES))));
and it is correct.But I can not make second version:constant
CONST_LOG_NUMBER_SAMPLES : Natural :=
Natural(ceil(LOG(2,real(CONST_NUMBER_SAMPLES))));ORconstant
CONST_LOG_NUMBER_SAMPLES : Natural :=
Natural(ceil(LOG(real(2),real(CONST_NUMBER_SAMPLES))));How should I write
LOG with base = 2?Thanks,Create

Note that '2.0' is used as the base, not '2'.
constant CONST_LOG_NUMBER_SAMPLES : Natural :=
Natural(ceil(LOG(2.0,real(CONST_NUMBER_SAMPLES))));

Alternatively you could use the log2 function (see above).

KJ