topic LOG10 FUNCTION IN SAS in SAS Programming

LOG10 FUNCTION IN SAS

Dinkepile — Fri, 26 Mar 2021 19:06:23 GMT

Good day

How do we program this in SAS:

Log10(90*20*10^dilution)

Re: LOG10 FUNCTION IN SAS

ballardw — Fri, 26 Mar 2021 19:11:07 GMT

Assuming there is a variable named dilution and it is numeric:

result =Log10(90*20*10**dilution);

Re: LOG10 FUNCTION IN SAS

Dinkepile — Fri, 26 Mar 2021 19:13:39 GMT

Yes thank you.

Do you perhaps know a function that can turn a number of days and give
hours instead?

Re: LOG10 FUNCTION IN SAS

Tom — Fri, 26 Mar 2021 19:53:10 GMT

hours = days * 24 ;

Re: LOG10 FUNCTION IN SAS

PhilC — Fri, 26 Mar 2021 19:57:28 GMT

Wait, wait, wait!

result =Log10(90*20*10**dilution);
 /*
 ... =Log10(90*20) + Log10(10**dilution);
 ... =Log10(90*20) + dilution * Log10(10);
 ... =Log10(90*20) + dilution * 1;
*/
result =Log10(90*20) + dilution ;

List of logarithmic identities - Wikipedia

This is better for numerical precision purposes, I believe.

Re: LOG10 FUNCTION IN SAS

Dinkepile — Fri, 26 Mar 2021 20:22:42 GMT

Thanks so much for your email.

Kind Regards
Dinkepile

Re: LOG10 FUNCTION IN SAS

ballardw — Fri, 26 Mar 2021 21:06:03 GMT

@PhilC wrote:

Wait, wait, wait!
result =Log10(90*20*10**dilution);
 /*
 ... =Log10(90*20) + Log10(10**dilution);
 ... =Log10(90*20) + dilution * Log10(10);
 ... =Log10(90*20) + dilution * 1;
*/
result =Log10(90*20) + dilution ;
List of logarithmic identities - Wikipedia

This is better for numerical precision purposes, I believe.

Probably.