X

We Value Your Privacy

We and our partners use technology such as cookies on our site to personalise content and ads, provide social media features, and analyse our traffic. Click below to consent to the use of this technology across the web. You can change your mind and change your consent choices at anytime by returning to this site.

Update Consent
DISCOVER
×
Loading ...

How to Plot a Horizontal Line in Matlab

Updated July 20, 2017

A horizontal line is a line whose points all share the same y-value. A horizontal line is perpendicular to a vertical line, whose points all share the same x-value. MATLAB is a technical computer program use for data processing and data visualisation. When plotting data it is often necessary to plot a horizontal line through a specific point to emphasise a particular point or area. Below shows an example of how to plot a horizontal line in MATLAB by defining the x and y-values that the horizontal line will pass through.

Loading ...
  1. Clear all active variables in the workspace by typing clear all in the command windows.

  2. Define the y-intercept value that the line will pass through. If the line is not meant to pass through the y-axis, define the height of the horizontal line. In this example, the height of the horizontal line will be 3, therefore type y=3 into the command window.

  3. Define the starting and ending points of the horizontal line by inputting the x-axis values into the command window. In this example, the line will start at -4 and end at 4 on the x-axis. Therefore enter x1=-4 and x2=4 into the command window.

  4. Plot the horizontal line by entering plot([x1, x2], [y1, y1]) into the command window. This will plot a horizontal line that runs from the points (-4,3) to (4,3). Since both y values are the same, the line will be horizontal.

  5. Tip

    A vertical line can be plotted in the same manor by keeping the x-values constant and changing the y values.

Loading ...

About the Author

Michael Peter has been a technical writer since 2006 for a power/start-up company and has published scientific papers in research journals including "Analytical Chemistry" and "Electrochimica Acta." He holds a Bachelor of Science in mechanical engineering and is currently completing his Ph.D. related to nano/microfludics and spectroscopy.

Loading ...