Why Multiple plots (hold on) in MATLAB? - Purpose & Use Cases

The Big Idea

What if you could see all your data stories unfold together on one simple graph?

The Scenario

Imagine you want to compare two different sets of data on the same graph, like tracking your daily steps and calories burned over a week. Without a way to draw both lines on one plot, you'd have to create separate graphs and flip back and forth to compare.

The Problem

Manually creating separate plots for each data set is slow and confusing. You lose the easy visual comparison, and it's easy to make mistakes copying or aligning the graphs. It's like trying to compare two recipes by writing them on different pieces of paper instead of side by side.

The Solution

The hold on command in MATLAB lets you draw multiple plots on the same graph easily. It keeps the current plot visible so you can add new data lines without erasing the old ones. This way, you see all your data together clearly and quickly.

Before vs After

✗ Before

plot(x1, y1)
plot(x2, y2)  % This erases the first plot

✓ After

plot(x1, y1)
hold on
plot(x2, y2)
hold off

What It Enables

It enables clear, direct comparison of multiple data sets on one graph, making analysis faster and more intuitive.

Real Life Example

Tracking your weight and exercise time on the same chart to see how they relate over a month, all in one view.

Key Takeaways

Hold on lets you add multiple plots to one graph without erasing.

It saves time and reduces errors compared to making separate plots.

It helps you compare data visually in a single, clear picture.