Golang : Accessing dataframe-go element by row, column and name example



Tags : golang python-pandas dataframe excel gonum

Dataframe-go is similar to Python's pandas package and it is used for statistics and data manipulation inside a Go program. Use this package together with Gonum and you can do a lot more fun stuff such as predicting a trend momentum, etc..

The code below is just a simple example from my own future reference. Basically it shows how to get an element data by row and column or get a series by name.

Here you go!


 package main

 import (
  "fmt"

  "github.com/rocketlaunchr/dataframe-go"
 )

 func main() {
  s1 := dataframe.NewSeriesInt64("day", nil, 1, 2, 3, 4, 5, 6, 7, 8)
  s2 := dataframe.NewSeriesFloat64("sales", nil, 50.3, 23.4, 56.2, nil, nil, 84.2, 72, 89)
  df := dataframe.NewDataFrame(s1, s2)

  fmt.Print(df)

  // access element by row and column
  // get the first item value from SALES column
  fmt.Println(df.Series[1].Value(0))

  // get the first item value from DAY column
  fmt.Println(df.Series[0].Value(7))

  // instead of using Series[1] and Series[0]
  // we can extract the int value from NameToColumn and use it to get
  // the same result
  salesSeries, err := df.NameToColumn("sales") // case sensitive

  if err != nil {
 fmt.Println(err)
  } else {
 // do a type assertion of float64 on the interface{} result
 diff := df.Series[salesSeries].Value(1).(float64) - df.Series[salesSeries].Value(0).(float64)
 fmt.Println("Delta : ", diff)
  }

 }

Output:

+-----+-------+---------+

| | DAY | SALES |

+-----+-------+---------+

| 0: | 1 | 50.3 |

| 1: | 2 | 23.4 |

| 2: | 3 | 56.2 |

| 3: | 4 | NaN |

| 4: | 5 | NaN |

| 5: | 6 | 84.2 |

| 6: | 7 | 72 |

| 7: | 8 | 89 |

+-----+-------+---------+

| 8X2 | INT64 | FLOAT64 |

+-----+-------+---------+

50.3

8

Delta : -26.9

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Tags : golang python-pandas dataframe excel gonum

By Adam Ng(黃武俊)

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