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Linewidth and Line Style.

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The linewidth and linestyle property can be used to change the width and the style of the line chart. Linewidth is specified in pixels. The default line width is 1 pixel showing a thin line. Thus, a number greater than 1 will output a thicker line depending on the value provided.

We can also set the line style of a line chart using the linestyle parameter. It can take a string such as "solid", "dotted", "dashed" or "dashdot". Let us write the Program applying some of the customisations.

Program : Consider the average heights and weights of persons aged 8 to 16 stored in the following two lists:

height = [121.9,124.5,129.5,134.6,139.7,147.3, 

152.4, 157.5,162.6] 

weight= [19.7,21.3,23.5,25.9,28.5,32.1,35.7,39.6, 

43.2] 

Let us plot a line chart where: 

i. x axis will represent weight 

ii. y axis will represent height 

iii. x axis label should be “Weight in kg” 

iv. y axis label should be “Height in cm” 

v. colour of the line should be green 

vi. use * as marker 

vii. Marker size as10 

viii. The title of the chart should be “Average weight with respect to average height”. 

ix. Line style should be dashed 

x. Linewidth should be 2. 

import matplotlib.pyplot as plt 

import pandas as pd 

height=[121.9,124.5,129.5,134.6,139.7,147.3,152.4,157.5,162.6] 

weight=[19.7,21.3,23.5,25.9,28.5,32.1,35.7,39.6,43.2]

df=pd.DataFrame({"height":height,"weight":weight}) 

#Set xlabel for the plot 

plt.xlabel('Weight in kg') 

#Set ylabel for the plot

plt.ylabel('Height in cm') 

#Set chart title: 

plt.title('Average weight with respect to average height') 

#plot using marker'-*' and line colour as green

plt.plot(df.weight,df.height,marker='*',markersize=10,color='green 

',linewidth=2, linestyle='dashdot') 

plt.show()

In the above we created the DataFrame using 2 lists, and in the plot function we have passed the height and weight columns of the DataFrame. The output is shown in Figure.

Line chart showing average weight against average height

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