DECIMALFUNKTIONER I PYTHON | SÆT 1

Python i sin definition giver visse metoder til at udføre hurtigere decimal aritmetik med flydende komma ved hjælp af modulet 'decimal'.
Vigtige handlinger på decimaler
1. sqrt() :- Denne funktion beregner kvadratrod af decimaltallet.
2. exp() :- Denne funktion returnerer e^x (eksponent) af decimaltallet.

Python

    # Python code to demonstrate the working of    # sqrt() and exp()   # importing 'decimal' module to use decimal functions   import   decimal   # using exp() to compute the exponent of decimal number   a   =   decimal  .  Decimal  (  4.5  )  .  exp  ()   # using sqrt() to compute the square root of decimal number   b   =   decimal  .  Decimal  (  4.5  )  .  sqrt  ()   # printing the exponent   print   (  'The exponent of decimal number is : '    end  =  ''  )   print   (  a  )   # printing the square root   print   (  'The square root of decimal number is : '    end  =  ''  )   print   (  b  )

Produktion:

 The exponent of decimal number is : 90.01713130052181355011545675   
 The square root of decimal number is : 2.121320343559642573202533086    
    3. ln()    :- Denne funktion bruges til at beregne     naturlig logaritme    af decimaltallet.   
    4. log10()    :- Denne funktion bruges til at beregne     log (base 10)    af et decimaltal.   
    
 Python      # Python code to demonstrate the working of    # ln() and log10()   # importing 'decimal' module to use decimal functions   import   decimal   # using ln() to compute the natural log of decimal number   a   =   decimal  .  Decimal  (  4.5  )  .  ln  ()   # using sqrt() to compute the log10 of decimal number   b   =   decimal  .  Decimal  (  4.5  )  .  log10  ()   # printing the natural logarithm   print   (  'The natural logarithm of decimal number is : '    end  =  ''  )   print   (  a  )   # printing the log10   print   (  'The log(base 10) of decimal number is : '    end  =  ''  )   print   (  b  )   
       Produktion:     
  The natural logarithm of decimal number is : 1.504077396776274073373258352   
 The log(base 10) of decimal number is : 0.6532125137753436793763169118    
    5. as_tuple()    :- Returnerer decimaltallet som tupel indeholdende     3 argumenter fortegn(0 for + 1 for -) cifre og eksponentværdi    .   
    6. fma(ab)    :- Denne 'fma' står for     smeltet gange og addere    . Den beregner     (antal*a)+b    fra tallene i argumentationen.     Ingen afrunding af (antal*a)    foregår i denne funktion.   
    Eksempel:        
    
  decimal.Decimal(5).fma(23) --> (5*2)+3 = 13    
    
 Python      # Python code to demonstrate the working of    # as_tuple() and fma()   # importing 'decimal' module to use decimal functions   import   decimal   # using as_tuple() to return decimal number as tuple   a   =   decimal  .  Decimal  (  -  4.5  )  .  as_tuple  ()   # using fma() to compute fused multiply and addition   b   =   decimal  .  Decimal  (  5  )  .  fma  (  2    3  )   # printing the tuple   print   (  'The tuple form of decimal number is : '    end  =  ''  )   print   (  a  )   # printing the fused multiple and addition   print   (  'The fused multiply and addition of decimal number is : '    end  =  ''  )   print   (  b  )   
       Produktion:     
  The tuple form of decimal number is : DecimalTuple(sign=1 digits=(4 5) exponent=-1)   
 The fused multiply and addition of decimal number is : 13    
    7. sammenligne()    :- Denne funktion bruges til at sammenligne decimaltal.     Returnerer 1, hvis 1. decimalargument er større end 2. -1, hvis 1. decimalargument er mindre end 2. og 0, hvis begge er ens.     
    8. compare_total_mag()    :- Sammenligner den samlede størrelse af decimaltal.     Returnerer 1, hvis 1. decimalargument er større end 2. (ignorerer fortegn) -1, hvis 1. decimalargument er mindre end 2. (ignorerer fortegn) og 0, hvis begge er ens (ignorerer fortegn).     
    
 Python      # Python code to demonstrate the working of    # compare() and compare_total_mag()   # importing 'decimal' module to use decimal functions   import   decimal   # Initializing decimal number   a   =   decimal  .  Decimal  (  9.53  )   # Initializing decimal number   b   =   decimal  .  Decimal  (  -  9.56  )   # comparing decimal numbers using compare()   print   (  'The result of comparison using compare() is : '    end  =  ''  )   print   (  a  .  compare  (  b  ))   # comparing decimal numbers using compare_total_mag()   print   (  'The result of comparison using compare_total_mag() is : '    end  =  ''  )   print   (  a  .  compare_total_mag  (  b  ))   
       Produktion:     
  The result of comparison using compare() is : 1   
 The result of comparison using compare_total_mag() is : -1    
    9. copy_abs()    :- Denne funktion udskriver     absolut    værdien af decimalargumentet.   
    10. copy_negate()    :- Denne funktion udskriver     negation    af decimalargument.   
    11. copy_sign()    :- Denne funktion udskriver     første argument ved at kopiere tegnet fra 2. argument    .   
    
 Python      # Python code to demonstrate the working of    # copy_abs()copy_sign() and copy_negate()   # importing 'decimal' module to use decimal functions   import   decimal   # Initializing decimal number   a   =   decimal  .  Decimal  (  9.53  )   # Initializing decimal number   b   =   decimal  .  Decimal  (  -  9.56  )   # printing absolute value using copy_abs()   print   (  'The absolute value using copy_abs() is : '    end  =  ''  )   print   (  b  .  copy_abs  ())   # printing negated value using copy_negate()   print   (  'The negated value using copy_negate() is : '    end  =  ''  )   print   (  b  .  copy_negate  ())   # printing sign effected value using copy_sign()   print   (  'The sign effected value using copy_sign() is : '    end  =  ''  )   print   (  a  .  copy_sign  (  b  ))   
       Produktion:     
  The absolute value using copy_abs() is : 9.5600000000000004973799150320701301097869873046875   
 The negated value using copy_negate() is : 9.5600000000000004973799150320701301097869873046875   
 The sign effected value using copy_sign() is : -9.5299999999999993605115378159098327159881591796875    
    12. max()    :- Denne funktion beregner     maksimum    af to decimaltal.   
    13. min()    :- Denne funktion beregner     minimum    af to decimaltal.   
    
 Python      # Python code to demonstrate the working of    # min() and max()   # importing 'decimal' module to use decimal functions   import   decimal   # Initializing decimal number   a   =   decimal  .  Decimal  (  9.53  )   # Initializing decimal number   b   =   decimal  .  Decimal  (  7.43  )   # printing minimum of both values   print   (  'The minimum of two numbers is : '    end  =  ''  )   print   (  a  .  min  (  b  ))   # printing maximum of both values   print   (  'The maximum of two numbers is : '    end  =  ''  )   print   (  a  .  max  (  b  ))   
       Produktion:     
  The minimum of two numbers is : 7.429999999999999715782905696   
 The maximum of two numbers is : 9.529999999999999360511537816