Line styles, markers, and colors in MATLAB - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this MATLAB plot command?

Consider the following MATLAB code snippet:

plot(1:5, 'r--o')

What does this command produce in terms of line style, marker, and color?

MATLAB

plot(1:5, 'r--o')

A A red solid line with square markers

B A blue solid line with circle markers

C A red dashed line with circle markers

D A green dotted line with star markers

💡 Hint

The string 'r--o' specifies color, line style, and marker in that order.

In MATLAB plot syntax, 'r' means red color, '--' means dashed line, and 'o' means circle markers. So the plot shows a red dashed line with circle markers.

❓ Predict Output

intermediate

What color and marker does this plot use?

Given the MATLAB command:

plot(1:3, 'g:*')

What is the color, line style, and marker used?

MATLAB

plot(1:3, 'g:*')

A Green solid line with circle markers

B Green dotted line with star markers

C Blue dotted line with star markers

D Red dashed line with square markers

💡 Hint

The order is color, line style, then marker.

'g' means green color, ':' means dotted line, and '*' means star markers.

❓ Predict Output

advanced

What is the output of this MATLAB plot command with multiple style characters?

Analyze the MATLAB command:

plot(1:4, 'b-.s')

What line style, marker, and color does this produce?

MATLAB

plot(1:4, 'b-.s')

A Blue dash-dot line with square markers

B Blue dashed line with circle markers

C Black dash-dot line with square markers

D Blue solid line with star markers

💡 Hint

Remember 'b' is blue, '-.' is dash-dot line, and 's' is square marker.

The color 'b' is blue, '-.' is dash-dot line style, and 's' is square marker.

❓ Predict Output

advanced

What error or output does this MATLAB plot command produce?

Consider this MATLAB command:

plot(1:5, 'r-o-')

What happens when you run this?

MATLAB

plot(1:5, 'r-o-')

A Plots a red dotted line with square markers

B Plots a red solid line with circle markers

C Plots a red dashed line with circle markers

D Syntax error due to invalid line style string

💡 Hint

Line style strings must be in a valid order and format.

The string 'r-o-' is invalid because it repeats line style characters incorrectly, causing a syntax error.

🧠 Conceptual

expert

How many unique line style and marker combinations are possible with MATLAB's basic plot specifiers?

MATLAB basic plot specifiers include 7 colors (b,g,r,c,m,y,k), 7 line styles (-, --, :, -., none, ' ', ''), and 9 marker types (o, +, *, ., x, s, d, ^, v).

How many unique combinations of color, line style, and marker can be created if you must specify exactly one color, one line style, and one marker?

A 315

B 63

C 441

D 49

💡 Hint

Multiply the number of options for each category.

7 colors × 7 line styles × 9 markers = 441 combinations. However, some line styles like 'none' or empty strings do not produce visible lines, so if excluding those, the count reduces. Assuming all line styles count, answer is 441. But if 'none' and empty strings are excluded (2 styles), then 5 line styles remain: 7×5×9=315.