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Add log proc for base b of x

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This commit is contained in:
Koki Fushimi 2018-06-04 15:03:08 +09:00
commit d7913419d7
1 changed files with 3 additions and 1 deletions
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lib/pure/math.nim
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@ -141,6 +141,8 @@ when not defined(JS): # C
proc ln*(x: float32): float32 {.importc: "logf", header: "<math.h>".} proc ln*(x: float32): float32 {.importc: "logf", header: "<math.h>".}
proc ln*(x: float64): float64 {.importc: "log", header: "<math.h>".} proc ln*(x: float64): float64 {.importc: "log", header: "<math.h>".}
## Computes the natural log of `x` ## Computes the natural log of `x`
proc log*(b, x: float32): float32 = ln(x) / ln(b)
## Computes the logarithm base ``b`` of ``x``
proc log10*(x: float32): float32 {.importc: "log10f", header: "<math.h>".} proc log10*(x: float32): float32 {.importc: "log10f", header: "<math.h>".}
proc log10*(x: float64): float64 {.importc: "log10", header: "<math.h>".} proc log10*(x: float64): float64 {.importc: "log10", header: "<math.h>".}
## Computes the common logarithm (base 10) of `x` ## Computes the common logarithm (base 10) of `x`
@ -372,7 +374,7 @@ when not defined(JS): # C
proc `mod`*(x, y: float32): float32 {.importc: "fmodf", header: "<math.h>".} proc `mod`*(x, y: float32): float32 {.importc: "fmodf", header: "<math.h>".}
proc `mod`*(x, y: float64): float64 {.importc: "fmod", header: "<math.h>".} proc `mod`*(x, y: float64): float64 {.importc: "fmod", header: "<math.h>".}
## Computes the modulo operation for float operators. ## Computes the modulo operation for float operators.
else: # JS else: # JS
proc hypot*[T: float32|float64](x, y: T): T = return sqrt(x*x + y*y) proc hypot*[T: float32|float64](x, y: T): T = return sqrt(x*x + y*y)
proc pow*(x, y: float32): float32 {.importC: "Math.pow", nodecl.} proc pow*(x, y: float32): float32 {.importC: "Math.pow", nodecl.}