Removing panic from fileType (go-gota#89)

Removing panic from fileType, so the default type will be used, rather then stopping the program

CHANGELOG.md

@@ -200,3 +200,4 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 [0.6.0]:https://github.com/kniren/gota/compare/v0.5.0...v0.6.0
 [0.7.0]:https://github.com/kniren/gota/compare/v0.6.0...v0.7.0
 [0.8.0]:https://github.com/kniren/gota/compare/v0.7.0...v0.8.0
+[0.9.0]:https://github.com/kniren/gota/compare/v0.8.0...v0.9.0

README.md

@@ -260,8 +260,8 @@ mean := func(s series.Series) series.Series {
     }
     return series.Floats(sum / float64(len(floats)))
 }
-df.Cbind(mean)
-df.Rbind(mean)
+df.Capply(mean)
+df.Rapply(mean)
 ```
 
 #### Chaining operations

dataframe/dataframe.go

@@ -13,7 +13,7 @@ import (
 	"strings"
 	"unicode/utf8"
 
-	"github.com/kniren/gota/series"
+	"github.com/go-gota/gota/series"
 )
 
 // DataFrame is a data structure designed for operating on table like data (Such
@@ -962,10 +962,12 @@ func LoadRecords(records [][]string, options ...LoadOption) DataFrame {
 
 		t, ok := cfg.types[colname]
 		if !ok {
-			t = cfg.defaultType
-			if cfg.detectTypes {
-				t = findType(rawcol)
-			}
+		  t = cfg.defaultType
+		  if cfg.detectTypes {
+		    if l, err := findType(rawcol); err != nil {
+		      t = l
+		    }
+		  }
 		}
 		types[i] = t
 	}
@@ -1831,7 +1833,7 @@ func parseSelectIndexes(l int, indexes SelectIndexes, colnames []string) ([]int,
 	return idx, nil
 }
 
-func findType(arr []string) series.Type {
+func findType(arr []string) (series.Type, error) {
 	var hasFloats, hasInts, hasBools, hasStrings bool
 	for _, str := range arr {
 		if str == "" || str == "NaN" {
@@ -1853,15 +1855,15 @@ func findType(arr []string) series.Type {
 	}
 	switch {
 	case hasStrings:
-		return series.String
+	  return series.String, nil
 	case hasBools:
-		return series.Bool
+	  return series.Bool, nil
 	case hasFloats:
-		return series.Float
+	  return series.Float, nil
 	case hasInts:
-		return series.Int
+	  return series.Int, nil
 	default:
-		panic("couldn't detect type")
+	  return series.String, fmt.Errorf("couldn't detect type")
 	}
 }
 

series/series.go

@@ -8,7 +8,7 @@ import (
 
 	"math"
 
-	"github.com/gonum/stat"
+	"gonum.org/v1/gonum/stat"
 )
 
 // Series is a data structure designed for operating on arrays of elements that
@@ -92,12 +92,12 @@ type Comparator string
 // Supported Comparators
 const (
 	Eq        Comparator = "==" // Equal
-	Neq                  = "!=" // Non equal
-	Greater              = ">"  // Greater than
-	GreaterEq            = ">=" // Greater or equal than
-	Less                 = "<"  // Lesser than
-	LessEq               = "<=" // Lesser or equal than
-	In                   = "in" // Inside
+	Neq       Comparator = "!=" // Non equal
+	Greater   Comparator = ">"  // Greater than
+	GreaterEq Comparator = ">=" // Greater or equal than
+	Less      Comparator = "<"  // Lesser than
+	LessEq    Comparator = "<=" // Lesser or equal than
+	In        Comparator = "in" // Inside
 )
 
 // Type is a convenience alias that can be used for a more type safe way of
@@ -107,9 +107,9 @@ type Type string
 // Supported Series Types
 const (
 	String Type = "string"
-	Int         = "int"
-	Float       = "float"
-	Bool        = "bool"
+	Int    Type = "int"
+	Float  Type = "float"
+	Bool   Type = "bool"
 )
 
 // Indexes represent the elements that can be used for selecting a subset of