func Eval(expression string) (*Result, error) {
var status C.ParseStatus
cmd := C.CString(expression)
defer C.free(unsafe.Pointer(cmd))
cmdRChar := C.mkChar(cmd)
protector := Protect(cmdRChar)
defer protector.Unprotect()
cmdSexp := C.allocVector(C.STRSXP, 1)
protector.Protect(cmdSexp)
C.SET_STRING_ELT(cmdSexp, 0, cmdRChar)
parsedCmd := C.R_ParseVector(cmdSexp, -1, (*C.ParseStatus)(unsafe.Pointer(&status)), C.R_NilValue)
if status != C.PARSE_OK {
return nil, fmt.Errorf("Invalid command: %s", C.GoString(cmd))
}
protector.Protect(parsedCmd)
var result C.SEXP
errorOccured := 0
/* Loop is needed here as EXPSEXP will be of length > 1 */
for i := 0; i < int(C.Rf_length(parsedCmd)); i++ {
result = C.R_tryEval(C.VECTOR_ELT(parsedCmd, C.R_xlen_t(i)), C.R_GlobalEnv, (*C.int)(unsafe.Pointer(&errorOccured))) //R 3.0
if errorOccured != 0 {
return nil, fmt.Errorf("R error occured executing: %s", C.GoString(cmd))
}
}
return NewResult(result), nil
}
func (this *Result) AsNumeric() *NumericVector {
if !this.IsNumeric() {
panic("Not a numeric vector")
}
v := NumericVector{}
v.length = int(C.Rf_length(this.expr))
v.expr = this.expr
return &v
}
func (this *Result) AsGenericVector() *Vector {
if !this.IsGenericVector() {
panic("Not a generic vector")
}
v := Vector{}
v.length = int(C.Rf_length(this.expr))
v.expr = this.expr
return &v
}
func (this *Result) AsComplex() *ComplexVector {
if !this.IsComplex() {
panic("Not a complex vector")
}
v := ComplexVector{}
v.length = int(C.Rf_length(this.expr))
v.expr = this.expr
return &v
}