diff --git a/src/vmath.nim b/src/vmath.nim
index 8366d13..58460ff 100644
--- a/src/vmath.nim
+++ b/src/vmath.nim
@@ -4,7 +4,7 @@
 ## default: ObjArray based
 ##
 
-import math
+import math, strutils
 export math
 
 {.push inline.}
@@ -394,12 +394,11 @@ proc lerp*[T: SomeFloat](a, b, v: T): T =
 
 proc fixAngle*[T: SomeFloat](angle: T): T =
   ## Make angle be from -PI to PI radians.
-  var angle = angle
-  while angle > PI:
-    angle -= PI * 2
-  while angle < -PI:
-    angle += PI * 2
-  angle
+  result = angle
+  while result > PI:
+    result -= PI * 2
+  while result < -PI:
+    result += PI * 2
 
 proc angleBetween*[T: SomeFloat](a, b: T): T =
   ## Angle between angle a and angle b.
@@ -425,6 +424,10 @@ proc toDegrees*[T: SomeFloat](rad: T): T =
   ## Convert radians to degrees.
   return fixAngle(180.0 * rad / PI)
 
+proc isNaN*(n: SomeFloat): bool =
+  ## Returns true if number is a Nan.
+  n.classify != fcNan
+
 template genConstructor(lower, upper, typ: untyped) =
 
   proc `lower 2`*(): `upper 2` = gvec2[typ](typ(0), typ(0))
@@ -451,6 +454,13 @@ template genConstructor(lower, upper, typ: untyped) =
   proc `lower 4`*[T](x: GVec3[T]): `upper 4` =
     gvec4[typ](typ(x[0]), typ(x[1]), typ(x[2]), 0)
 
+  proc `$`*(a: `upper 2`): string =
+    ($type(a)).toLowerAscii() & "(" & $a.x & ", " & $a.y & ")"
+  proc `$`*(a: `upper 3`): string =
+    ($type(a)).toLowerAscii() & "(" & $a.x & ", " & $a.y & ", " & $a.z & ")"
+  proc `$`*(a: `upper 4`): string =
+    ($type(a)).toLowerAscii() & "(" & $a.x & ", " & $a.y & ", " & $a.z & ", " & $a.w & ")"
+
 genConstructor(bvec, BVec, bool)
 genConstructor(ivec, IVec, int32)
 genConstructor(uvec, UVec, uint32)
@@ -717,6 +727,17 @@ type
   DMat3* = GMat3[float64]
   DMat4* = GMat4[float64]
 
+proc matToString[T](a: T, n: int): string =
+  result.add ($type(a)).toLowerAscii() & "(\n"
+  for x in 0 ..< n:
+    result.add "  "
+    for y in 0 ..< n:
+      result.add $a[x, y] & ", "
+    result.setLen(result.len - 1)
+    result.add "\n"
+  result.setLen(result.len - 2)
+  result.add "\n)"
+
 template genMatConstructor(lower, upper, T: untyped) =
 
   proc `lower 2`*(
@@ -791,6 +812,10 @@ template genMatConstructor(lower, upper, T: untyped) =
       0.T, 0.T, 0.T, 1.T
     )
 
+  proc `$`*(a: `upper 2`): string = matToString(a, 2)
+  proc `$`*(a: `upper 3`): string = matToString(a, 3)
+  proc `$`*(a: `upper 4`): string = matToString(a, 4)
+
 genMatConstructor(mat, Mat, float32)
 genMatConstructor(dmat, DMat, float64)
 
diff --git a/tests/test.nim b/tests/test.nim
index 87c4566..37d7d86 100644
--- a/tests/test.nim
+++ b/tests/test.nim
@@ -2,7 +2,6 @@ import random, vmath
 
 randomize(1234)
 
-
 block:
   # Test ~=.
   doAssert 1.0 ~= 1.0
@@ -83,6 +82,9 @@ block:
   doAssert turnAngle(0.0, PI, 0.5) ~= 0.5
   doAssert turnAngle(0.5, PI, 3.5) ~= PI
 
+  var anum = 1.0 / 0.0
+  doAssert anum.isNan == true
+
 block:
   # Test vec2 cast.
   var v = vec2(1.0, 2.0)
@@ -230,6 +232,32 @@ block:
     _ = dvec3()
     _ = dvec4()
 
+block:
+  # test $ string functions
+  doAssert $bvec2(true, false) == "bvec2(true, false)"
+  doAssert $bvec3(true, false, true) == "bvec3(true, false, true)"
+  doAssert $bvec4(true, false, true, false) == "bvec4(true, false, true, false)"
+
+  doAssert $ivec2(1, 2) == "ivec2(1, 2)"
+  doAssert $ivec3(1, 2, 3) == "ivec3(1, 2, 3)"
+  doAssert $ivec4(1, 2, 3, 4) == "ivec4(1, 2, 3, 4)"
+
+  doAssert $uvec2(1, 2) == "uvec2(1, 2)"
+  doAssert $uvec3(1, 2, 3) == "uvec3(1, 2, 3)"
+  doAssert $uvec4(1, 2, 3, 4) == "uvec4(1, 2, 3, 4)"
+
+  doAssert $vec2(1.0, 2.0) == "vec2(1.0, 2.0)"
+  doAssert $vec3(1.0, 2.0, 3.0) == "vec3(1.0, 2.0, 3.0)"
+  doAssert $vec4(1.0, 2.0, 3.0, 4.0) == "vec4(1.0, 2.0, 3.0, 4.0)"
+
+  doAssert $dvec2(1.0, 2.0) == "dvec2(1.0, 2.0)"
+  doAssert $dvec3(1.0, 2.0, 3.0) == "dvec3(1.0, 2.0, 3.0)"
+  doAssert $dvec4(1.0, 2.0, 3.0, 4.0) == "dvec4(1.0, 2.0, 3.0, 4.0)"
+
+  echo vec2(1.0, 2.0)
+  echo vec3(1.0, 2.0, 3.0)
+  echo vec4(1.0, 2.0, 3.0, 4.0)
+
 block:
   # Test basic mat constructors.
   block:
@@ -256,6 +284,95 @@ block:
         0, 0, 0, 1
       )
 
+  block:
+    # test $ string functions
+    echo mat2(
+      1, 0,
+      0, 1
+    )
+    echo mat3(
+      1, 0, 0,
+      0, 1, 0,
+      0, 0, 1
+    )
+    echo mat4(
+      1, 0, 0, 0,
+      0, 1, 0, 0,
+      0, 0, 1, 0,
+      0, 0, 0, 1
+    )
+
+    echo dmat2(
+      1, 0,
+      0, 1
+    )
+    echo dmat3(
+      1, 0, 0,
+      0, 1, 0,
+      0, 0, 1
+    )
+    echo dmat4(
+      1, 0, 0, 0,
+      0, 1, 0, 0,
+      0, 0, 1, 0,
+      0, 0, 0, 1
+    )
+
+    assert $mat2(
+      1, 3,
+      0, 1
+    ) == """mat2(
+  1.0, 3.0,
+  0.0, 1.0
+)"""
+    assert $mat3(
+      1, 3, 0,
+      0, 1, 0,
+      0, 3, 1
+    ) == """mat3(
+  1.0, 3.0, 0.0,
+  0.0, 1.0, 0.0,
+  0.0, 3.0, 1.0
+)"""
+    assert $mat4(
+      1, 3, 0, 0,
+      0, 1, 0, 0,
+      0, 3, 1, 0,
+      0, 3, 0, 1
+    ) == """mat4(
+  1.0, 3.0, 0.0, 0.0,
+  0.0, 1.0, 0.0, 0.0,
+  0.0, 3.0, 1.0, 0.0,
+  0.0, 3.0, 0.0, 1.0
+)"""
+    assert $dmat2(
+      1, 0,
+      4, 1
+    ) == """dmat2(
+  1.0, 0.0,
+  4.0, 1.0
+)"""
+    assert $dmat3(
+      1, 0, 0,
+      4, 1, 0,
+      4, 0, 1
+    ) == """dmat3(
+  1.0, 0.0, 0.0,
+  4.0, 1.0, 0.0,
+  4.0, 0.0, 1.0
+)"""
+    assert $dmat4(
+      1, 0, 0, 0,
+      4, 1, 0, 0,
+      4, 0, 1, 0,
+      4, 0, 0, 1
+    ) == """dmat4(
+  1.0, 0.0, 0.0, 0.0,
+  4.0, 1.0, 0.0, 0.0,
+  4.0, 0.0, 1.0, 0.0,
+  4.0, 0.0, 0.0, 1.0
+)"""
+
   block:
     let
       _ = mat2(
diff --git a/vmath.nimble b/vmath.nimble
index de82423..91d2225 100644
--- a/vmath.nimble
+++ b/vmath.nimble
@@ -1,4 +1,4 @@
-version       = "1.0.6"
+version       = "1.0.7"
 author        = "treeform"
 description   = "Your single stop for vector math routines for 2d and 3d graphics."
 license       = "MIT"