mathematical routine: log(n)

db95...@oliven.lhg.hib.no (Helge J. Hannisdal)

Delphi Developer

Wed, 18 Jun 1902 08:00:00 GMT

mathematical routine: log(n)

Are there any built-in procedures for calculation of log(n)?

If not, have anybody got an idea how to make one?

--
-Helge Hannisdal

Arno Thero

Delphi Developer

Wed, 18 Jun 1902 08:00:00 GMT

Re:mathematical routine: log(n)

db95...@oliven.lhg.hib.no (Helge J. Hannisdal) wrote:

Quote

>Are there any built-in procedures for calculation of log(n)?

>If not, have anybody got an idea how to make one?

>--
>-Helge Hannisdal

Pascal do not carry the log function (Delphi 2.0 does). It do
however carry the Ln (natural log) function. With a bit of
maths it follows that :

Log(x) := ln(x)/ln(10);

So just write a function that impliments this.
--

Arno Theron
PC-Estim/PROJEVAL(7D2C)
Tel(012) 311-1824
082-569-2532
Fax(012) 311-4438
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Tom Wheele

Delphi Developer

Wed, 18 Jun 1902 08:00:00 GMT

Re:mathematical routine: log(n)

In article <4kfspp$...@ole.uninett.no>
db95...@oliven.lhg.hib.no "Helge J. Hannisdal" writes:

Quote

> Are there any built-in procedures for calculation of log(n)?

> If not, have anybody got an idea how to make one?

Try the `ln' function.

This gives logarithms to base `e'.

For base `b' (eg 10) use:

result:=ln(n)/ln(b);

.splitbung
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Dave Langsta

Delphi Developer

Wed, 18 Jun 1902 08:00:00 GMT

Re:mathematical routine: log(n)

In article <4kfspp$...@ole.uninett.no>,
Helge J. Hannisdal <db95...@oliven.lhg.hib.no> wrote:

Quote

>Are there any built-in procedures for calculation of log(n)?

>If not, have anybody got an idea how to make one?

Try the simple mathematical identity.....

log (x) = ln(x)
10 ------
ln(10)

Implementation is left as an exercise for the reader...

--
Dave Langstaff | Janet:d...@uk.ac.aber
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Roger Garie

Delphi Developer

Wed, 18 Jun 1902 08:00:00 GMT