plotter: fix documentation typo and clarify example

gonum · Apr 6, 2019 · 99b5ceb · 99b5ceb
1 parent f2023ba
commit 99b5ceb
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Showing 2 changed files with 3 additions and 3 deletions.
diff --git a/plotter/heat.go b/plotter/heat.go
@@ -24,7 +24,7 @@ type GridXYZ interface {
 	// It will panic if c or r are out of bounds for the grid.
 	Z(c, r int) float64
 
-	// X returns the coordinate for the column at the index x.
+	// X returns the coordinate for the column at the index c.
 	// It will panic if c is out of bounds for the grid.
 	X(c int) float64
 

diff --git a/plotter/heat_test.go b/plotter/heat_test.go
@@ -32,14 +32,14 @@ func (g offsetUnitGrid) Z(c, r int) float64 { return g.Data.At(r, c) }
 func (g offsetUnitGrid) X(c int) float64 {
 	_, n := g.Data.Dims()
 	if c < 0 || c >= n {
-		panic("index out of range")
+		panic("column index out of range")
 	}
 	return float64(c) + g.XOffset
 }
 func (g offsetUnitGrid) Y(r int) float64 {
 	m, _ := g.Data.Dims()
 	if r < 0 || r >= m {
-		panic("index out of range")
+		panic("row index out of range")
 	}
 	return float64(r) + g.YOffset
 }