Line styles (solid, dashed, dotted) in Matplotlib - Step-by-Step Execution

Concept Flow - Line styles (solid, dashed, dotted)

Start Plot Setup

↓

Choose Line Style

↓

Solid

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Draw Line with Style

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Show Plot Output

The flow shows choosing a line style (solid, dashed, dotted), drawing the line with that style, and displaying the plot.

Execution Sample

Matplotlib

import matplotlib.pyplot as plt
plt.plot([1,2,3], [1,4,9], linestyle='solid')
plt.plot([1,2,3], [2,5,10], linestyle='dashed')
plt.plot([1,2,3], [3,6,11], linestyle='dotted')
plt.show()

This code draws three lines with different line styles: solid, dashed, and dotted.

Execution Table

Step	Action	Line Data	Line Style	Plot State
1	Plot first line	[1,2,3], [1,4,9]	solid	Line 1 added with solid style
2	Plot second line	[1,2,3], [2,5,10]	dashed	Line 2 added with dashed style
3	Plot third line	[1,2,3], [3,6,11]	dotted	Line 3 added with dotted style
4	Show plot	All lines	solid, dashed, dotted	Plot displayed with 3 styled lines

💡 All lines plotted and plot window shown, execution ends.

Variable Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	Final
lines	[]	[Line1: solid]	[Line1: solid, Line2: dashed]	[Line1: solid, Line2: dashed, Line3: dotted]	[3 lines with styles]

Key Moments - 2 Insights

Why does the line style change the appearance of the line?

The 'linestyle' parameter controls how the line is drawn: 'solid' is continuous, 'dashed' shows breaks, and 'dotted' shows dots. See execution_table steps 1-3 where each line is added with a different style.

What happens if you omit the linestyle parameter?

Matplotlib uses the default solid line style. This is why in step 1, specifying 'solid' looks the same as default.

Visual Quiz - 3 Questions

Look at the execution_table, what line style is used in step 2?

A dotted

B solid

C dashed

D dashdot

💡 Hint

Check the 'Line Style' column in execution_table row for step 2.

At which step is the dotted line added to the plot?

A Step 1

B Step 3

C Step 2

D Step 4

💡 Hint

Look at the 'Action' and 'Line Style' columns in execution_table.

If you remove the linestyle='dashed' from step 2, what happens to the line style?

A It becomes solid

B It becomes dotted

C It disappears

D It becomes dashdot

💡 Hint

Refer to key_moments about default line style when linestyle is omitted.

Concept Snapshot

matplotlib line styles:
Use 'linestyle' parameter in plt.plot()
Options: 'solid', 'dashed', 'dotted'
Controls line appearance
Default is 'solid'
Example: plt.plot(x, y, linestyle='dashed')

Full Transcript

This visual execution shows how matplotlib draws lines with different styles. First, a solid line is plotted, then a dashed line, and finally a dotted line. Each step adds a line with the specified style to the plot. The variable 'lines' tracks the lines added. The plot is shown with all three lines visible. The linestyle parameter changes how the line looks: solid is continuous, dashed has breaks, dotted shows dots. If linestyle is omitted, the line is solid by default.