gioui.org@v0.6.1-0.20240506124620-7a9ce51988ce/internal/fling/extrapolation_test.go (about)

     1  // SPDX-License-Identifier: Unlicense OR MIT
     2  
     3  package fling
     4  
     5  import "testing"
     6  
     7  func TestDecomposeQR(t *testing.T) {
     8  	A := &matrix{
     9  		rows: 3, cols: 3,
    10  		data: []float32{
    11  			12, 6, -4,
    12  			-51, 167, 24,
    13  			4, -68, -41,
    14  		},
    15  	}
    16  	Q, Rt, ok := decomposeQR(A)
    17  	if !ok {
    18  		t.Fatal("decomposeQR failed")
    19  	}
    20  	R := Rt.transpose()
    21  	QR := Q.mul(R)
    22  	if !A.approxEqual(QR) {
    23  		t.Log("A\n", A)
    24  		t.Log("Q\n", Q)
    25  		t.Log("R\n", R)
    26  		t.Log("QR\n", QR)
    27  		t.Fatal("Q*R not approximately equal to A")
    28  	}
    29  }
    30  
    31  func TestFit(t *testing.T) {
    32  	X := []float32{-1, 0, 1}
    33  	Y := []float32{2, 0, 2}
    34  
    35  	got, ok := polyFit(X, Y)
    36  	if !ok {
    37  		t.Fatal("polyFit failed")
    38  	}
    39  	want := coefficients{0, 0, 2}
    40  	if !got.approxEqual(want) {
    41  		t.Fatalf("polyFit: got %v want %v", got, want)
    42  	}
    43  }