In the box plot, a box is created from the first quartile to the third quartile, a vertical line is also there which goes through the box at the median. You can also use the userpath function to change your user path location, if you don't like the default location chosen by MATLAB. A Box Plot is also known as Whisker plot is created to display the summary of the set of data values having properties like minimum, first quartile, median, third quartile and maximum.
'/Users/steve/OneDrive - MathWorks/MATLAB' Run the userpath function to see where that is. If you want to do this for each MATLAB session, put the call to set into a file called startup.m that is located in your user path folder. This default setting does not persist between MATLAB sessions, though. lines on a high-DPI monitor works a little better. After some additional experimentation, I found that using 1.5-pt. lines can make markers indistinct, and I can confirm that observation when not using a high-DPI monitor. Blog reader Gang Yao pointed out that using 2-pt. Update: Using a thicker line width might only work well for high-DPI monitors.
#Box and whisker plot matlab full#
For a full explanation of the MATLAB system for setting default graphics object properties, see Default Property Values in the MATLAB documentation.
#Box and whisker plot matlab code#
This odd-looking line of code sets the default LineWidth property for line objects to 2.0.
Here it is: set(groot, 'defaultLineLineWidth',2.0) It turns out that there's a way to get MATLAB to draw all plotted lines thicker by default. You can do that in each call to plot by using the LineWidth parameter, like this: plot(x,y1,x,y2, 'LineWidth',2.0)īut then you have to remember to add the LineWidth parameter all the time. So, I like to plot thicker lines, roughly 1.5-2.0 points. On a high resolution display, however, the plotted lines are pretty close to 0.5 points thick.Īnd, to my eyes, that's too thin to see the colors clearly. Because of the way the figure above was captured for display in your browser, the lines probably appear a little thicker than 0.5 points. Here's where I have to wave my hands a little. The plot above uses the default MATLAB line width of 0.5 points. Here's a basic example of plot from the MATLAB documentation: x = linspace(-2*pi,2*pi) Using datatoplot we can create the boxplot with the following code: Create a figure instance fig plt.figure(1, figsize(9, 6)) Create an axes instance ax fig.addsubplot(111) Create the boxplot bp ax. That's because I don't use the default line thickness for my plots. You would see something like this instead:ĭo you see the difference? Exactly what you see will vary depending on your computer and your display resolution, but the original image from my blog post has thicker colored lines. If you ran my code exactly as I posted it, though, you probably wouldn't see exactly the same thing. In last week's blog post on pursuit curves, I showed this figure: I have adjusted the upper and lower whiskers (although lower whisker is not needed in this example) using the following code however this code doesn't remove outliers within the whisker making the result look unclear.Today's blog post is dedicated to everyone whose eyes aren't as young as they used to be. Is there a way to specify 95 or even 76 to be within the whiskers? or the value of the upper whisker? Please can the method to change this be explained.įor example, for the following 100 pieces of data: MATLAB's default behaviour is to have the whisker length = 1.5 * IQR (75th percentile - 25th percentile) and this whisker length can be changed to another multiple of IQR, but not to a specific percentile. I'd like to use the 95th percentile as the upper whisker and 5th percentile as the lower whisker. For boxplots in MATLAB, I'd like to ask if a specific percentile can be used as the upper whisker.
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