本文整理汇总了Golang中github.com/verdverm/go-symexpr.Expr.DerivConst方法的典型用法代码示例。如果您正苦于以下问题：Golang Expr.DerivConst方法的具体用法？Golang Expr.DerivConst怎么用？Golang Expr.DerivConst使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类github.com/verdverm/go-symexpr.Expr的用法示例。
在下文中一共展示了Expr.DerivConst方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Golang代码示例。
示例1: LevmarExpr
func LevmarExpr(e expr.Expr, searchDim int, task ExprProblemType, guess []float64, train, test []*PointSet) []float64 {
ps := train[0].NumPoints()
PS := len(train) * ps
c := make([]float64, len(guess))
var cd callback_data
cd.Train = train
cd.Test = test
cd.E = e
cd.Coeff = c
cd.Task = task
cd.J = make([]expr.Expr, len(guess))
for i, _ := range cd.J {
deriv := e.DerivConst(i)
// simp := deriv.Simplify(expr.DefaultRules())
cd.J[i] = deriv
}
// c/levmar inputs
coeff := make([]C.double, len(guess))
for i, g := range guess {
coeff[i] = C.double(g)
}
y := make([]C.double, PS)
for i1, T := range train {
for i2, p := range T.Points() {
i := i1*ps + i2
y[i] = C.double(p.Depnd(searchDim))
}
}
ya := (*C.double)(unsafe.Pointer(&y[0]))
ca := (*C.double)(unsafe.Pointer(&coeff[0]))
ni := C.int(PS)
mi := C.int(len(c))
// C.levmar_dif(ya, ca, mi, ni, unsafe.Pointer(&cd))
C.levmar_der(ya, ca, mi, ni, unsafe.Pointer(&cd))
for i, _ := range coeff {
c[i] = float64(coeff[i])
}
return c
}示例2: StackLevmarExpr
func StackLevmarExpr(e expr.Expr, x_dims int, coeff []float64, c_ygiven, c_input []C_double) []float64 {
// fmt.Printf("Entering Stack Levmar: \n")
c_coeff := make([]C.double, len(coeff))
for i, c := range coeff {
c_coeff[i] = C.double(c)
}
// c_ygiven := make([]C.double, len(ygiven))
// for i, c := range ygiven {
// c_ygiven[i] = C.double(c)
// }
// c_input := make([]C.double, len(input))
// for i, c := range input {
// c_input[i] = C.double(c)
// }
cp := (*C.double)(unsafe.Pointer(&c_coeff[0]))
mi := C.int(len(coeff))
yp := (*C.double)(unsafe.Pointer(&c_ygiven[0]))
ni := C.int(len(c_ygiven))
var sd *C.StackData
sd = new(C.StackData)
// fmt.Printf("x_len: %d x_dim: %d\n", len(input), x_dims)
sd.x_len = C.int(len(c_input))
sd.x_dim = C.int(x_dims)
sd.x_data = (*C.double)(unsafe.Pointer(&c_input[0]))
serial := make([]int, 0)
serial = e.StackSerial(serial)
// fmt.Printf("StackSerial: %v\n", serial)
c_serial := make([]C.int, len(serial))
for i, I := range serial {
c_serial[i] = C.int(I)
}
sd.expr.serial = (*C.int)(unsafe.Pointer(&c_serial[0]))
sd.expr.s_len = C.int(len(serial))
// fmt.Printf("GOT HERE: %v\n", serial)
derivs := make([]C.StackExpr, len(coeff))
for i, _ := range coeff {
deriv := e.DerivConst(i)
dserial := make([]int, 0)
dserial = deriv.StackSerial(dserial)
d_serial := make([]C.int, len(dserial))
for i, I := range dserial {
d_serial[i] = C.int(I)
}
derivs[i].serial = (*C.int)(unsafe.Pointer(&d_serial[0]))
derivs[i].s_len = C.int(len(d_serial))
}
sd.derivs = (*C.StackExpr)(unsafe.Pointer(&derivs[0]))
sd.d_len = C.int(mi)
// fmt.Printf("Going into stack_levmar_dif\n")
C.stack_levmar_dif(yp, cp, mi, ni, unsafe.Pointer(sd))
// C.stack_levmar_der(yp, cp, mi, ni, unsafe.Pointer(sd))
// fmt.Printf("Returned from stack_levmar_dif\n")
c := make([]float64, len(c_coeff))
for i, _ := range c_coeff {
c[i] = float64(c_coeff[i])
}
// fmt.Printf("C0: %f\n", c[0])
return c
}