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natural logaritm

keremusu1
Beginner
‎01-18-2008 05:48 AM
608 Views

Hello!

I'm trying to calculate the natural logaritm of a number with the command LOG. But, whatever the number within the brackets is, this warning appears:

This argument data type is incompatible with this intrinsic procedure; procedure assumed EXTERNAL. [LOG]

What do I need to do to be able to calculate the natural logaritm of a number?

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Jeffrey_A_Intel
Employee
‎01-18-2008 06:07 AM
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What is the type of the argument? Showing the relevant code would be the best answer.

LOG(X) requires that the type of X be either real or complex.

This sample program works fine:

PROGRAM

 log_test

IMPLICIT NONE

PARAMETER wp = KIND( 1.0D0 )

REAL( wp ) :: x, z

x = 10.0_wp

z = LOG( x )

WRITE( *, * ) x, z

END

 PROGRAM log_test

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