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Add Laplacian and CrossLaplacian difference functions (#154)

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* Add Laplacian and CrossLaplacian difference functions

* use usesOrigin
This commit is contained in:
Brendan Tracey
2017-08-03 21:29:12 -06:00
committed by GitHub
parent 4d30eb012e
commit 084f84ee0e
7 changed files with 560 additions and 57 deletions
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5
diff/fd/hessian.go
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@@ -84,6 +84,7 @@ func hessianSerial(dst *mat.SymDense, f func(x []float64) float64, x []float64,
n := len(x)
xCopy := make([]float64, n)
fo := func() float64 {
// Copy x in case it is modified during the call.
copy(xCopy, x)
return f(x)
}
@@ -98,7 +99,7 @@ func hessianSerial(dst *mat.SymDense, f func(x []float64) float64, x []float64,
if pti.Loc == 0 && ptj.Loc == 0 {
v = origin
} else {
// Copying the code anew has two benefits. First, it
// Copying the data anew has two benefits. First, it
// avoids floating point issues where adding and then
// subtracting the step don't return to the exact same
// location. Secondly, it protects against the function
@@ -125,7 +126,7 @@ func hessianConcurrent(dst *mat.SymDense, nWorkers, evals int, f func(x []float6
}
send := make(chan run, evals)
ans := make(chan run)
ans := make(chan run, evals)
var originWG sync.WaitGroup
hasOrigin := usesOrigin(stencil)