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Danfo.js Documentation
Getting Started
API reference
General Functions
Input/Output
Series
Dataframe
Creating a DataFrame
DataFrame.sort_index
DataFrame.append
DataFrame.nunique
DataFrame.tensor
DataFrame.print
DataFrame.to_csv
DataFrame.to_json
DataFrame.to_excel
DataFrame.sort_values
DataFrame.set_index
DataFrame.reset_index
DataFrame.rename
DataFrame.drop
DataFrame.astype
DataFrame.shape
DataFrame.axis
DataFrame.ndim
DataFrame.values
DataFrame.select_dtypes
DataFrame.ctypes
DataFrame.index
DataFrame.loc
DataFrame.iloc
DataFrame.head
DataFrame.tail
DataFrame.sample
DataFrame.add
DataFrame.sub
DataFrame.mul
DataFrame.div
DataFrame.pow
DataFrame.mod
DataFrame.mean
DataFrame.median
DataFrame.min
DataFrame.max
DataFrame.std
DataFrame.var
DataFrame.count
DataFrame.round
DataFrame.cumsum
DataFrame.cummin
DataFrame.cummax
DataFrame.cumprod
DataFrame.copy
DataFrame.describe
DataFrame.sum
DataFrame.abs
DataFrame.query
DataFrame.addColumn
DataFrame.groupby
DataFrame.column
DataFrame.fillna
DataFrame.isna
DataFrame.dropna
DataFrame.apply
DataFrame.apply_map
DataFrame.It
DataFrame.gt
DataFrame.le
DataFrame.ge
DataFrame.ne
DataFrame.eq
DataFrame.replace
Configuration Options
Plotting
Groupby
User Guides
Building Data Driven Applications with Danfo.js - Book
Contributing Guide
Release Notes
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Dataframe
Two-dimensional, size-mutable, potentially heterogeneous tabular data.
DataFrame(data, { columns: [ Array ], dtypes: [ Array ], index: [Array], options: Object})

Attributes

​DataFrame.index​
The index (row labels) of the DataFrame.
​DataFrame.columns​
The column labels of the DataFrame.
​DataFrame.ctypes​
Return the data types in the DataFrame.
​DataFrame.select_dtypes​
Return a subset of the DataFrame’s columns based on the column dtypes.
​DataFrame.values​
Return a Numpy representation of the DataFrame.
​DataFrame.axes​
Return a Object representing the axes of the DataFrame.
​DataFrame.ndim​
Return an int representing the number of axes / array dimensions.
​DataFrame.size​
Return an int representing the number of elements in this object.
​DataFrame.shape​
Return a tuple representing the dimensionality of the DataFrame.

Conversion

​DataFrame.astype​
Cast a pandas object to a specified dtype dtype.
​DataFrame.copy​
Make a copy of this object’s indices and data.

Indexing, iteration

​DataFrame.head​
Return the first n rows
​DataFrame.loc​
Access a group of rows and columns by label(s) or a boolean array.
​DataFrame.iloc​
Purely integer-location based indexing for selection by position.
​DataFrame.tail​
Return the last n rows.
​DataFrame.query​
Query the columns of a DataFrame with a boolean expression.

Binary operator functions

​DataFrame.add​
Get Addition of dataframe and other, element-wise (binary operator add).
​DataFrame.sub​
Get Subtraction of dataframe and other, element-wise (binary operator sub).
​DataFrame.mul​
Get Multiplication of dataframe and other, element-wise (binary operator mul).
​DataFrame.div​
Get Floating division of dataframe and other, element-wise (binary operator truediv).
​DataFrame.mod​
Get Modulo of dataframe and other, element-wise (binary operator mod).
​DataFrame.pow​
Get Exponential power of dataframe and other, element-wise (binary operator pow).
​DataFrame.lt​
Get Less than of dataframe and other, element-wise (binary operator lt).
​DataFrame.gt​
Get Greater than of dataframe and other, element-wise (binary operator gt).
​DataFrame.le​
Get Less than or equal to of dataframe and other, element-wise (binary operator le).
​DataFrame.ge​
Get Greater than or equal to of dataframe and other, element-wise (binary operator ge).
​DataFrame.ne​
Get Not equal to of dataframe and other, element-wise (binary operator ne).
​DataFrame.eq​
Get Equal to of dataframe and other, element-wise (binary operator eq).

Function application & GroupBy

​DataFrame.apply​
Apply a function along an axis of the DataFrame.
​DataFrame.groupby​
Group DataFrame using a mapper or by a Series of columns.
​DataFrame.map​
Map a function on Object along an axis to DataFrame

Computations / descriptive stats

​DataFrame.abs​
Return a Series/DataFrame with absolute numeric value of each element.
​DataFrame.corr​
Compute pairwise correlation of columns, excluding NA/null values.
​DataFrame.count​
Count non-NAN cells for each column or row.
​DataFrame.cummax​
Return cumulative maximum over a DataFrame or Series axis.
​DataFrame.cummin​
Return cumulative minimum over a DataFrame or Series axis.
​DataFrame.cumprod​
Return cumulative product over a DataFrame or Series axis.
​DataFrame.cumsum​
Return cumulative sum over a DataFrame or Series axis.
​DataFrame.describe​
Generate descriptive statistics.
​DataFrame.max​
Return the maximum of the values for the requested axis.
​DataFrame.mean​
Return the mean of the values for the requested axis.
​DataFrame.median​
Return the median of the values for the requested axis.
​DataFrame.min​
Return the minimum of the values for the requested axis.
​DataFrame.mode​
Get the mode(s) of each element along the selected axis.
​DataFrame.round​
Round a DataFrame to a variable number of decimal places.
​DataFrame.sum​
Return the sum of the values for the requested axis.
​DataFrame.std​
Return sample standard deviation over requested axis.
​DataFrame.var​
Return unbiased variance over requested axis.
​DataFrame.nunique​
Count distinct observations over requested axis.

Reindexing / selection / label manipulation

​
​
​DataFrame.drop​
Drop specified labels from rows or columns.
​DataFrame.head​
Return the first n rows.
​DataFrame.rename​
Alter axes labels.
​DataFrame.reset_index​
Reset the index of a DataFrame
​DataFrame.sample​
Return a random sample of items from an axis of object.
​DataFrame.set_index​
Set the DataFrame index using existing columns.
​DataFrame.tail​
Return the last n rows.

Missing data handling

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​
​DataFrame.dropna​
Remove missing values.
​DataFrame.fillna​
Fill NaN values with specified values
​DataFrame.isna​
Detect missing values.
​DataFrame.replace​
Replace values given in replace with value.

Sorting & transposing

​
​
​DataFrame.sort_values​
Sort by the values along either axis.
​DataFrame.T​
Return transpose of DataFrame

Combining / comparing / joining / merging

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​DataFrame.addColumn​
Add new columns to a DataFrame.
​DataFrame.concat​
Concatenate DataFrames together.
​DataFrame.merge​
Merge DataFrame or named Series objects with a database-style join.

Plotting

Series.plot is both a callable method and a namespace attribute for specific plotting methods of the form Series.plot.<kind>.
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​DataFrame.plot.bar​
Vertical bar plot.
​DataFrame.plot.box​
Make a box plot of the DataFrame columns.
​DataFrame.plot.violin​
Make a violin plot of the DataFrame columns.
​DataFrame.plot.hist​
Draw one histogram of the DataFrame’s columns.
​DataFrame.plot.scatter​
Generate Kernel Density Estimate plot using Gaussian kernels.
​DataFrame.plot.line​
Plot Series or DataFrame as lines.
​DataFrame.plot.pie​
Generate a pie plot.
​Timeseries Plots​
Time series plots
​Table​
Display Series as Interactive table in Div

Serialization / IO / conversion

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​
​DataFrame.to_csv​
Write object to a comma-separated values (csv) file.
​DataFrame.to_json​
Convert the object to a JSON string.
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Contents
Attributes
Conversion
Indexing, iteration
Binary operator functions
Function application & GroupBy
Computations / descriptive stats
Reindexing / selection / label manipulation
Missing data handling
Sorting & transposing
Combining / comparing / joining / merging
Plotting
Serialization / IO / conversion