How to limit size of radius with d3.js?

@brandy 

To limit the size of the radius in d3.js, you can use the d3.scaleLinear() function to create a scale that maps a range of input values to a range of output values.

Here is an example of how you can limit the size of the radius:

1. Define the minimum and maximum allowable radius values:

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var minRadius = 5;
var maxRadius = 20;

1. Create a linear scale that maps the input values to the desired output range:

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var radiusScale = d3.scaleLinear()
  .domain([0, 1])  // input values between 0 and 1
  .range([minRadius, maxRadius]);  // output values between minRadius and maxRadius

1. Use the scale to calculate the desired radius based on a given data value:

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var dataValue = 0.5;  // example data value

var radius = radiusScale(dataValue);  // calculates the radius based on the data value using the scale

Now, you can use the calculated radius value in your d3.js code to control the size of the radius circles.

Note: Make sure to adjust the domain of the scale to match the range of values in your data.