You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: correlation.go
    path of file: ./repos/gocryptotrader/gctscript/modules/ta/indicators
    
    the code of the file until where you have to start completion: package indicators

import (
	"errors"
	"fmt"
	"strings"

	objects "github.com/d5/tengo/v2"
	"github.com/thrasher-corp/gct-ta/indicators"
	"github.com/thrasher-corp/gocryptotrader/gctscript/modules"
	"github.com/thrasher-corp/gocryptotrader/gctscript/wrappers/validator"
)

// CorrelationCoefficientModule indicator commands
var CorrelationCoefficientModule = map[string]objects.Object{
	"calculate": &objects.UserFunction{Name: "calculate", Value: correlationCoefficient},
}

// CorrelationCoefficient is the string constant
const CorrelationCoefficient = "Correlation Coefficient"

// Correlation defines a custom correlation coefficient indicator tengo object
type Correlation struct {
	objects.Array
	Period i
    
func correlationCoefficient(args ...objects.Object) (objects.Object, error) {
	if len(args) != 3 {
		return nil, objects.ErrWrongNumArguments
	}

	r := new(Correlation)
	if validator.IsTestExecution.Load() == true {
		return r, nil
	}

	var allErrors []string
	ohlcvProcessor := func(args []objects.Object, idx int) ([]float64, error) {
		ohlcvInput := objects.ToInterface(args[idx])
		ohlcvInputData, valid := ohlcvInput.([]interface{})
		if !valid {
			return nil, fmt.Errorf(modules.ErrParameterConvertFailed, OHLCV)
		}

		var ohlcvClose []float64
		for x := range ohlcvInputData {
			t, ok := ohlcvInputData[x].([]interface{})
			if !ok {
				return nil, errors.New("ohlcvInputData type assert failed")
			}
			if len(t) < 5 {
				return nil, errors.New("ohlcvInputData invalid data length")
			}
			value, err := toFloat64(t[4])
			if err != nil {
				allErrors = append(allErrors, err.Error())
			}
			ohlcvClose = append(ohlcvClose, value)
		}
		return ohlcvClose, nil
	}

	closures1, err := ohlcvProcessor(args, 0)
	if err != nil {
		return nil, err
	}

	closures2, err := ohlcvProcessor(args, 1)
	if err != nil {
		return nil, err
	}

	inTimePeriod, ok := objects.ToInt(args[2])
	if !ok {
		allErrors = append(allErrors, fmt.Sprintf(modules.ErrParameterConvertFailed, inTimePeriod))
	}

	if len(allErrors) > 0 {
		return nil, errors.New(strings.Join(allErrors, ", "))
	}

	r.Period = inTimePeriod

	ret := indicators.CorrelationCoefficient(closures1, closures2, inTimePeriod)
	for x := range ret {
		r.Value = append(r.Value, &objects.Float{Value: ret[x]})
	}

	return r, nil
}