43523 - How to convert values created with the LOG2 function back to their original value

Sample 43523: How to convert values created with the LOG2 function back to their original value

There may be times when you have a value that was created using the SAS function LOG2 that you would like to return to its original value.

The sample below will do that. Also, it does not matter if the value was created using the SAS function, the same conversion formula applies.

The results of running the sample below can be viewed by clicking on the Results tab above.

   data one;                
     do i = 1 to 32;        
       L2=log2(i);         
       original=2**(L2);   
       output;              
     end;                   
    run;                     
    proc print; 
    run;

These sample files and code examples are provided by SAS Institute Inc. "as is" without warranty of any kind, either express or implied, including but not limited to the implied warranties of merchantability and fitness for a particular purpose. Recipients acknowledge and agree that SAS Institute shall not be liable for any damages whatsoever arising out of their use of this material. In addition, SAS Institute will provide no support for the materials contained herein.

The SAS System                                                  10:30 Tuesday, June 14, 2011  55

Obs     i       L2      original

  1     1    0.00000        1
  2     2    1.00000        2
  3     3    1.58496        3
  4     4    2.00000        4
  5     5    2.32193        5
  6     6    2.58496        6
  7     7    2.80735        7
  8     8    3.00000        8
  9     9    3.16993        9
 10    10    3.32193       10
 11    11    3.45943       11
 12    12    3.58496       12
 13    13    3.70044       13
 14    14    3.80735       14
 15    15    3.90689       15
 16    16    4.00000       16
 17    17    4.08746       17
 18    18    4.16993       18
 19    19    4.24793       19
 20    20    4.32193       20
 21    21    4.39232       21
 22    22    4.45943       22
 23    23    4.52356       23
 24    24    4.58496       24
 25    25    4.64386       25
 26    26    4.70044       26
 27    27    4.75489       27
 28    28    4.80735       28
 29    29    4.85798       29
 30    30    4.90689       30
 31    31    4.95420       31
 32    32    5.00000       32

Type:	Sample
Topic:	SAS Reference ==> Functions ==> Mathematical ==> LOG2 SAS Reference ==> DATA Step

Date Modified:	2011-06-14 14:06:01
Date Created:	2011-06-14 13:37:36

Product Family	Product	Host	SAS Release
Product Family	Product	Host	Starting	Ending
SAS System	Base SAS	z/OS
		Z64
		OpenVMS VAX
		Microsoft® Windows® for 64-Bit Itanium-based Systems
		Microsoft Windows Server 2003 Datacenter 64-bit Edition
		Microsoft Windows Server 2003 Enterprise 64-bit Edition
		Microsoft Windows XP 64-bit Edition
		Microsoft® Windows® for x64
		OS/2
		Microsoft Windows 95/98
		Microsoft Windows 2000 Advanced Server
		Microsoft Windows 2000 Datacenter Server
		Microsoft Windows 2000 Server
		Microsoft Windows 2000 Professional
		Microsoft Windows NT Workstation
		Microsoft Windows Server 2003 Datacenter Edition
		Microsoft Windows Server 2003 Enterprise Edition
		Microsoft Windows Server 2003 Standard Edition
		Microsoft Windows Server 2003 for x64
		Microsoft Windows Server 2008
		Microsoft Windows Server 2008 for x64
		Microsoft Windows XP Professional
		Windows 7 Enterprise 32 bit
		Windows 7 Enterprise x64
		Windows 7 Home Premium 32 bit
		Windows 7 Home Premium x64
		Windows 7 Professional 32 bit
		Windows 7 Professional x64
		Windows 7 Ultimate 32 bit
		Windows 7 Ultimate x64
		Windows Millennium Edition (Me)
		Windows Vista
		Windows Vista for x64
		64-bit Enabled AIX
		64-bit Enabled HP-UX
		64-bit Enabled Solaris
		ABI+ for Intel Architecture
		AIX
		HP-UX
		HP-UX IPF
		IRIX
		Linux
		Linux for x64
		Linux on Itanium
		OpenVMS Alpha
		OpenVMS on HP Integrity
		Solaris
		Solaris for x64
		Tru64 UNIX

Support

Sample 43523: How to convert values created with the LOG2 function back to their original value

Operating System and Release Information