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Challenge description for Data Visualization with d3: Set a Domain and a Range on a Scale
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tommy
2017-06-16 16:58:26 -07:00
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challenges/04-data-visualization/data-visualization-with-d3.json
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@ -1437,7 +1437,7 @@
],
"description": [
"By default, scales use the identity relationship - the input value maps to the output value. But scales can be much more flexible and interesting.",
"Say a data set has values ranging from 50 to 480. This in the input information for a scale, and is also known as the domain.",
"Say a data set has values ranging from 50 to 480. This is the input information for a scale, and is also known as the domain.",
"You want to map those points along the <code>x</code> axis on the SVG canvas, between 10 units and 500 units. This is the output information, which is also known as the range.",
"The <code>domain()</code> and <code>range()</code> methods set these values for the scale. Both methods take an array of at least two elements as an argument. Here's an example:",
"<blockquote>// Set a domain<br>// The domain covers the set of input values<br>scale.domain([50, 480]);<br>// Set a range<br>// The range covers the set of output values<br>scale.range([10, 500]);<br>scale(50) // Returns 10<br>scale(480) // Returns 500<br>scale(325) // Returns 323.37<br>scale(750) // Returns 807.67<br>d3.scaleLinear()</blockquote>",