keygaps
v0.0.3
Published
Fill in key values for time series data
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Readme
Keygaps
What does this do?
The primary function of this library is to fill in the gaps in data for charting libraries. Many charting libraries, d3 comes to mind, does handle missing data well when dealing with multi-dimensional data.
By multi-dimensional data I simply mean where there are groups of data which should contain a consistent set of x values.
This may look like:
[
{company: 'acme', x: 1, y: 99},
{company: 'acme', x: 2, y: 70},
{company: 'acme', x: 4, y: 99},
{company: 'foomaker', x: 1, y: 102},
{company: 'foomaker', x: 2, y: 99},
{company: 'foomaker', x: 3, y: 99}
]
In the above example the following data is missing:
[
{company: 'acme', x: 3, y: ?},
{company: 'foomaker', x: 4, y: ?}
]
Keygaps comes to the rescue here and helps fill in the missing data.
Installation
Node.js
npm install keygaps
Browser
I suggest using Webpack, Browserify, ect. to provide an environment with require.
Usage
fillValues = require('keygaps').fillValues
# Create data with missing keys
data = [
{category: 'a', x: 1, y: 10},
{category: 'b', x: 2, y: 11},
{category: 'c', x: 1, y: 10},
{category: 'd', x: 2, y: 10},
]
# Create a valueFunction to tell how to deserialize the key
# arguments[0] is the ev array passed below
valueFunction = ->
obj = {}
obj['category'] = arguments[0][0]
obj['x'] = arguments[0][1]
obj
output = Keygaps.fillValues({
values: data,
# Create a keyFunction to know how to group the data
keyFunction: (input) -> [input.category, input.x],
valueFunction: valueFunction
})
# object.missingValues
{
"a:2": { "category": "a", "x": 2, "y": 0 },
"b:1": { "category": "b", "x": 1, "y": 0 },
"c:2": { "category": "c", "x": 2, "y": 0 },
"d:1": { "category": "d", "x": 1, "y": 0 }
}
# output.values
[
{ "category": "a", "x": 1, "y": 10 },
{ "category": "b", "x": 2, "y": 11 },
{ "category": "c", "x": 1, "y": 10 },
{ "category": "d", "x": 2, "y": 10 },
{ "category": "a", "x": 2, "y": 0 },
{ "category": "b", "x": 1, "y": 0 },
{ "category": "c", "x": 2, "y": 0 },
{ "category": "d", "x": 1, "y": 0 }
]
Testing
npm run test
Contributing
npm run dev
npm run test
Release process
npm run test
gg c <msg>
npm-release patch
gg represents git goodies, it's just nice. The npm-release docs can be found @ https://github.com/phuu/npm-release