I have a question about using the area function; or perhaps another function is in order... I created this plot from a large text file: 

The green and the blue represent two different files. What I want to do is fill in the area between the red line and each run, respectively. I can create an area plot with a similar idea, but when I plot them on the same figure, they do not overlap correctly. Essentially, 4 plots would be on one figure.

I hope this makes sense. 

MATLAB is a powerful tool for data analysis and visualization. One of the most common tasks in MATLAB is filling in the area between two sets of data. This can be done by plotting both sets of data as lines in one figure, and then using the fill function to fill in the area between them.

To start, you will need to create two vectors of data, representing the x and y values of each set of data. Then, use the plot function to plot both sets of data as lines in one figure. For example: 

x1 = [1 2 3 4 5];
y1 = [2 4 6 8 10];
x2 = [1 2 3 4 5];
y2 = [1 3 5 7 9];

figure
plot(x1,y1,'r','LineWidth',2)
hold on
plot(x2,y2,'b','LineWidth',2)

This will plot two lines, one in red and one in blue, in the same figure. To fill in the area between the two lines, you can use the fill function. For example: 

x = [x1 fliplr(x2)];
y = [y1 fliplr(y2)];
fill(x,y,'g')

This will fill in the area between the two lines with a green color. You can also specify the transparency of the fill using the FaceAlpha property. For example: 

fill(x,y,'g','FaceAlpha',0.5)

This will fill in the area between the two lines with a semi-transparent green color. You can also add labels and a title to your figure, as well as customize the axis limits, to make your plot more readable.