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Update example calculation result in BigMath document #428

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Merged
tompng merged 1 commit into from
Sep 12, 2025
Merged

Update example calculation result in BigMath document #428

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32 changes: 16 additions & 16 deletions lib/bigdecimal/math.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -25,8 +25,8 @@
#
# include BigMath
#
# a = BigDecimal((PI(100)/2).to_s)
# puts sin(a,100) # => 0.99999999999999999999......e0
# a = BigDecimal((PI(49)/2).to_s)
# puts sin(a,100) # => 0.9999999999...9999999986e0
#
module BigMath
module_function
Expand All @@ -37,8 +37,8 @@ module BigMath
# Computes the square root of +decimal+ to the specified number of digits of
# precision, +numeric+.
#
# BigMath.sqrt(BigDecimal('2'), 16).to_s
# #=> "0.1414213562373095048801688724e1"
# BigMath.sqrt(BigDecimal('2'), 32).to_s
# #=> "0.14142135623730950488016887242097e1"
#
def sqrt(x, prec)
BigDecimal::Internal.validate_prec(prec, :sqrt)
Expand Down Expand Up @@ -81,8 +81,8 @@ def sqrt(x, prec)
#
# If +decimal+ is Infinity or NaN, returns NaN.
#
# BigMath.sin(BigMath.PI(5)/4, 5).to_s
# #=> "0.70710678118654752440082036563292800375e0"
# BigMath.sin(BigMath.PI(5)/4, 32).to_s
# #=> "0.70710807985947359435812921837984e0"
#
def sin(x, prec)
BigDecimal::Internal.validate_prec(prec, :sin)
Expand Down Expand Up @@ -118,8 +118,8 @@ def sin(x, prec)
#
# If +decimal+ is Infinity or NaN, returns NaN.
#
# BigMath.cos(BigMath.PI(4), 16).to_s
# #=> "-0.999999999999999999999999999999856613163740061349e0"
# BigMath.cos(BigMath.PI(16), 32).to_s
# #=> "-0.99999999999999999999999999999997e0"
#
def cos(x, prec)
BigDecimal::Internal.validate_prec(prec, :cos)
Expand All @@ -140,8 +140,8 @@ def cos(x, prec)
# BigMath.tan(BigDecimal("0.0"), 4).to_s
# #=> "0.0"
#
# BigMath.tan(BigMath.PI(4) / 4, 4).to_s
# #=> "0.99999999999999999999419869652481995799388629632650769e0"
# BigMath.tan(BigMath.PI(24) / 4, 32).to_s
# #=> "0.99999999999999999999999830836025e0"
#
def tan(x, prec)
BigDecimal::Internal.validate_prec(prec, :tan)
Expand All @@ -156,8 +156,8 @@ def tan(x, prec)
#
# If +decimal+ is NaN, returns NaN.
#
# BigMath.atan(BigDecimal('-1'), 16).to_s
# #=> "-0.785398163397448309615660845819878471907514682065e0"
# BigMath.atan(BigDecimal('-1'), 32).to_s
# #=> "-0.78539816339744830961566084581988e0"
#
def atan(x, prec)
BigDecimal::Internal.validate_prec(prec, :atan)
Expand Down Expand Up @@ -194,8 +194,8 @@ def atan(x, prec)
# Computes the value of pi to the specified number of digits of precision,
# +numeric+.
#
# BigMath.PI(10).to_s
# #=> "0.3141592653589793238462643388813853786957412e1"
# BigMath.PI(32).to_s
# #=> "0.31415926535897932384626433832795e1"
#
def PI(prec)
BigDecimal::Internal.validate_prec(prec, :PI)
Expand Down Expand Up @@ -239,8 +239,8 @@ def PI(prec)
# Computes e (the base of natural logarithms) to the specified number of
# digits of precision, +numeric+.
#
# BigMath.E(10).to_s
# #=> "0.271828182845904523536028752390026306410273e1"
# BigMath.E(32).to_s
# #=> "0.27182818284590452353602874713527e1"
#
def E(prec)
BigDecimal::Internal.validate_prec(prec, :E)
Expand Down
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