#Pyplot scatter point size how to

#Pyplot scatter point size how to

In this tutorial, we'll take a look at how to change the marker size in a Matplotlib scatter plot. Much of Matplotlib's popularity comes from its customization options - you can tweak just about any element from its hierarchy of objects. This allows you to add another dimension to your data.Matplotlib is one of the most widely used data visualization libraries in Python. Then, you learned how to change the size of markers based on another value. You first learned how to change the size of all markers. Being able to modify the size of markers allows you to more effectively communicate the intent of your data. In this tutorial, you learned how to set the marker size of scatterplot points in Matplotlib. If you were to change this, then the relative sizes that you see would change as well. By default, Matplotlib uses a resulting of 100 DPI (meaning, per inch). However, as with everything else in Matplotlib there is significant logic behind it.Įach point is actually the pixel size, which varies by the resolution that you set for the figure itself. It may feel like we’ve been setting values arbitrarily. Understanding what the marker size represents simplifies a lot of the understanding behind it. Using a function to set the marker size of points in Matplotlib What is the Marker Size in Matplotlib? Plt.title('Changing Marker Sizes Based on Another Value - datagy.io') # Adding another variable to control size We’ll add another array of values that will control the size: # Controlling the size of markers with another variable Because the s= parameter also accepts an array of values, we can simply pass in that array. Let’s say we had another dimension to our data, we can use the values in that dimension to control the size. In this section, we’ll look at using another set of values to set the size of matplotlib scatterplot markers. Changing the Marker Size for Individual Points in Matplotlib Scatterplots Based on Other Data In order to get a marker that is, say, size 10, we need to pass in the square of that. The s parameter is defined as the marker size in points ** 2, meaning that the value passed in is squared.

To understand what the s= parameter controls, we need to take a look at the documentation. Plt.title('Changing Marker Sizes for All Points - datagy.io')Ĭhanging the marker size for all markers in Matplotlib Let’s see how we can change the size for all markers using the s= parameter: # Changing the size for all markers in Matplotlib Passing in a list of values changes the size for each marker individually.Passing in a single value changes the size for all markers.

These options determine what the size of the markers is: The parameter accepts either an integer or a list of values. The size of points is based on the s= parameter. Matplotlib makes it simple to change the plot size for all points in a scatter plot. Changing the Marker Size for All Points in Matplotlib Scatterplots In the next section, you’ll learn how to change the marker size for all points in a Matplotlib scatterplot. Creating a simple scatterplot in Matplotlib