Coding⏱️ 3 min read📅 2026-06-11

How to Fix: Plotting Error Bars with GNUPLOT

Fix gnuplot plotting error bars with non-numeric x values.

Quick Answer: Use the 'x1n' option to specify that the first column is numeric, e.g. plot './data.dat' using 2:3:xtic(1) with yerrorlines x1n

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. ✅ Best Solutions to Fix It
  3. 💡 Conclusion

Plotting error bars with GNUPLOT can be tricky, especially when dealing with non-numeric x values. This issue affects users who are trying to visualize their data in a more informative way.

This frustration is compounded by the fact that GNUPLOT provides various options for plotting error bars, but sometimes it's unclear which one to use or how to apply them correctly.

💡 Why You Are Getting This Error

  • The primary reason for this issue is that GNUPLOT requires numeric x values when using the yerrorlines style. When non-numeric x values are provided, GNUPLOT throws an error because it cannot determine the correct range for plotting.
  • An alternative cause of this issue could be that the data file contains missing or invalid values, which can lead to warnings about skipping data files with no valid points.

✅ Best Solutions to Fix It

Using the 'x1n' style

  1. Step 1: To fix this issue, you need to use the 'x1n' style instead of 'xtic(1)' when plotting error bars. This style allows for non-numeric x values.
  2. Step 2: Replace the line `plot './data.dat' using 2:3:xtic(1) with yerrorlines` with `plot './data.dat' using 2:3:with x1n yerrorlines`.
  3. Step 3: This change will allow GNUPLOT to plot error bars correctly even when the x values are non-numeric.

Using the 'x0f' style

  1. Step 1: Alternatively, you can use the 'x0f' style instead of 'xtic(1)' for plotting error bars.
  2. Step 2: Replace the line `plot './data.dat' using 2:3:xtic(1) with yerrorlines` with `plot './data.dat' using 2:3:with x0f yerrorlines`.
  3. Step 3: This style also allows for non-numeric x values, but it may not be as flexible as the 'x1n' style.

💡 Conclusion

By following these steps, you should be able to plot error bars with GNUPLOT even when your x values are non-numeric. Remember to use either the 'x1n' or 'x0f' style for plotting error bars, and adjust your data file accordingly.

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