Texas Instruments TI-89 and TI-92 Plus Computer 

Last page update: March 07, 2000 
Number Base - for the TI-89 and TI-92 Plus
Version nBase(): 2.0   (March 07, 2000)
b2d(): 1.0   (September 22, 1999)
d2b(): 2.0   (March 07, 2000)
Download [ nbase.zip ] 13,050 bytes (contains d2b(), b2d(), nBase(), and this document)
Reference CRC Standard Mathematical Tables and Formula, 30th Edition, Paragraph 1.1.2, 1.2.4, 1.2.7. 
Description nBase(): Converts floating point numbers between bases. 
b2d(): Converts floating point numbers of any base to decimal.
d2b(): Converts floating point decimal numbers to any base.

March 07, 2000 - Modified nBase() and d2b() to return list of character values when base>36.

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Documentation Usage:
nBase(NumberStr | {NumberStr}, CurrentBase, NewBase | {NewBase, Precision}) 
b2d(NumberStr, CurrentBase
d2b(NumberStr | {NumberStr}, NewBase | {NewBase, Precision}) 

NumberStr: Alphanumeric STR representing a number to any base. if NumberStr is entered in braces, {}, a list of character values will be returned.

CurrentBase: The number base of NumberStr

NewBase: The number base that NumberStr should be converted to. 

Precision: Optional precision. Changes the limit of the number of  fractional positions from the default of 12. The default can be permanently changed by editing the line "12->pre" in the program code to the desired value. 

NOTE: These functions will accept bases greater than 36 but only 35 characters are available. This is permitted so that numbers of greater bases can be converted. If a character of value 3510 or greater is needed, a list of character values is returned instead.

NOTE: These functions will accept numbers (var type NUM) in NumberStr so that the user can more easily enter numbers of base 10 or less. Ex: nBase(10,2,1020)="2 [1020]" instead of nBase("10",2,1020)="2 [1020]"

Return value:
If any character in NumberStr is illegal in CurrentBase, undef is returned.
nBase(): If NumberStr is a STR, a STR is returned. if NumberStr is a NUM and NewBase=10, a NUM is returned. If NumberStr is enclosed in braces, {}, a list of character values is returned. 
d2b(): A STR is returned. 
b2d(): Normally a NUM is returned. If NumberStr is enclosed in braces, {}, a list of character values is returned.

1. nBase(10.101,2,10)   or   b2d(10.101,2) 

2. nBase(ln(5),10,8)   or   d2b(ln(5),8) 
     "1.470020373755 [8]" 

3. nBase("FF.01",16,2)   or   d2b(b2d("FF.01",16),2) 
     "11111111.00000001 [2]" 

4. nBase("FF.01",16,{2,1})   or   d2b(b2d("FF.01",16),{2,1}) 
     "11111111.0 [2]" 1. 

5. nBase({10.101},2,{11,2})   or   d2b({c},{11,2})|c=b2d(10.101,2)
     {2, ".", 6, 9}