Data commit

Task/Matrix-transposition/Go/matrix-transposition-1.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+    "fmt"
+
+    "gonum.org/v1/gonum/mat"
+)
+
+func main() {
+    m := mat.NewDense(2, 3, []float64{
+        1, 2, 3,
+        4, 5, 6,
+    })
+    fmt.Println(mat.Formatted(m))
+    fmt.Println()
+    fmt.Println(mat.Formatted(m.T()))
+}

Task/Matrix-transposition/Go/matrix-transposition-2.go

@@ -0,0 +1,19 @@
+package main
+
+import (
+    "fmt"
+
+    mat "github.com/skelterjohn/go.matrix"
+)
+
+func main() {
+    m := mat.MakeDenseMatrixStacked([][]float64{
+        {1, 2, 3},
+        {4, 5, 6},
+    })
+    fmt.Println("original:")
+    fmt.Println(m)
+    m = m.Transpose()
+    fmt.Println("transpose:")
+    fmt.Println(m)
+}

Task/Matrix-transposition/Go/matrix-transposition-3.go

@@ -0,0 +1,35 @@
+package main
+
+import "fmt"
+
+type row []float64
+type matrix []row
+
+func main() {
+    m := matrix{
+        {1, 2, 3},
+        {4, 5, 6},
+    }
+    printMatrix(m)
+    t := transpose(m)
+    printMatrix(t)
+}
+
+func printMatrix(m matrix) {
+    for _, s := range m {
+        fmt.Println(s)
+    }
+}
+
+func transpose(m matrix) matrix {
+    r := make(matrix, len(m[0]))
+    for x, _ := range r {
+        r[x] = make(row, len(m))
+    }
+    for y, s := range m {
+        for x, e := range s {
+            r[x][y] = e
+        }
+    }
+    return r
+}

Task/Matrix-transposition/Go/matrix-transposition-4.go

@@ -0,0 +1,51 @@
+package main
+
+import "fmt"
+
+type matrix struct {
+    ele    []float64
+    stride int
+}
+
+// construct new matrix from slice of slices
+func matrixFromRows(rows [][]float64) *matrix {
+    if len(rows) == 0 {
+        return &matrix{nil, 0}
+    }
+    m := &matrix{make([]float64, len(rows)*len(rows[0])), len(rows[0])}
+    for rx, row := range rows {
+        copy(m.ele[rx*m.stride:(rx+1)*m.stride], row)
+    }
+    return m
+}
+
+func main() {
+    m := matrixFromRows([][]float64{
+        {1, 2, 3},
+        {4, 5, 6},
+    })
+    m.print("original:")
+    m.transpose().print("transpose:")
+}
+
+func (m *matrix) print(heading string) {
+    if heading > "" {
+        fmt.Print("\n", heading, "\n")
+    }
+    for e := 0; e < len(m.ele); e += m.stride {
+        fmt.Println(m.ele[e : e+m.stride])
+    }
+}
+
+func (m *matrix) transpose() *matrix {
+    r := &matrix{make([]float64, len(m.ele)), len(m.ele) / m.stride}
+    rx := 0
+    for _, e := range m.ele {
+        r.ele[rx] = e
+        rx += r.stride
+        if rx >= len(r.ele) {
+            rx -= len(r.ele) - 1
+        }
+    }
+    return r
+}

Task/Matrix-transposition/Go/matrix-transposition-5.go

@@ -0,0 +1,61 @@
+package main
+
+import "fmt"
+
+type matrix struct {
+    stride int
+    ele    []float64
+}
+
+func main() {
+    m := matrix{3, []float64{
+        1, 2, 3,
+        4, 5, 6,
+    }}
+    m.print("original:")
+    m.transposeInPlace()
+    m.print("transpose:")
+}
+
+func (m *matrix) print(heading string) {
+    if heading > "" {
+        fmt.Print("\n", heading, "\n")
+    }
+    for e := 0; e < len(m.ele); e += m.stride {
+        fmt.Println(m.ele[e : e+m.stride])
+    }
+}
+
+func (m *matrix) transposeInPlace() {
+    h := len(m.ele) / m.stride
+    for start := range m.ele {
+        next := start
+        i := 0
+        for {
+            i++
+            next = (next%h)*m.stride + next/h
+            if next <= start {
+                break
+            }
+        }
+        if next < start || i == 1 {
+            continue
+        }
+
+        next = start
+        tmp := m.ele[next]
+        for {
+            i = (next%h)*m.stride + next/h
+            if i == start {
+                m.ele[next] = tmp
+            } else {
+                m.ele[next] = m.ele[i]
+            }
+            next = i
+            if next <= start {
+                break
+            }
+        }
+    }
+    m.stride = h
+}