Beispiel #1
0
func runTest(A *matrix.FloatMatrix, ntest, LB int) time.Duration {
	var W *matrix.FloatMatrix = nil
	var mintime time.Duration

	N := A.Cols()
	tau := matrix.FloatZeros(N, 1)
	if LB > 0 {
		W = matrix.FloatZeros(A.Rows(), LB)
	}
	fnc := func() {
		_, ERRmatops = matops.DecomposeQR(A, tau, W, LB)
	}

	A0 := A.Copy()
	for n := 0; n < ntest; n++ {
		if n > 0 {
			// restore original A
			A0.CopyTo(A)
			tau.Scale(0.0)
		}
		mperf.FlushCache()
		time0 := mperf.Timeit(fnc)
		if n == 0 || time0 < mintime {
			mintime = time0
		}
		if verbose {
			fmt.Printf("%.4f ms\n", time0.Seconds()*1000.0)
		}
	}
	return mintime
}
Beispiel #2
0
// single invocation for matops and lapack functions
func runCheck(A *matrix.FloatMatrix, LB int) (bool, time.Duration, time.Duration) {

	var W *matrix.FloatMatrix = nil
	N := A.Cols()
	tau := matrix.FloatZeros(N, 1)
	if LB > 0 {
		W = matrix.FloatZeros(A.Rows(), LB)
	}
	fnc := func() {
		_, ERRmatops = matops.DecomposeQR(A, tau, W, LB)
	}

	if verbose && N < 10 {
		fmt.Fprintf(os.Stderr, "A start:\n%v\n", A)
	}
	A0 := A.Copy()
	tau0 := tau.Copy()

	mperf.FlushCache()
	time0 := mperf.Timeit(fnc)
	if verbose && N < 10 {
		fmt.Fprintf(os.Stderr, "A end:\n%v\n", A)
		tau.SetSize(1, N, 1)
		fmt.Fprintf(os.Stderr, "tau: %v\n", tau)
	}

	fn2 := func() {
		ERRlapack = lapack.Geqrf(A0, tau0)
	}

	mperf.FlushCache()
	time2 := mperf.Timeit(fn2)
	if verbose && N < 10 {
		fmt.Fprintf(os.Stderr, "A0 end:\n%v\n", A0)
		tau0.SetSize(1, N, 1) // row vector
		fmt.Fprintf(os.Stderr, "tau0: %v\n", tau0)
	}
	// now A == A0 && tau == tau0

	ok := A.AllClose(A0)
	oktau := tau.AllClose(tau0)
	if !ok || !oktau {
		// save result to globals
		Rlapack = A0
		Rmatops = A
		TAUlapack = tau0
		TAUmatops = tau
	}
	return ok && oktau, time0, time2
}