Trying to complete a boxplot for the Z values of a matrix

I am trying to make a boxplot of the data in a matrix of size [925x902] so i dont want the boxplot to make multiple plots of each column/row and instead one single plot of all the data within the matrix

the matrix is called D and i have the statistical package install on MATLAB version R2021a

Any way t plot this as simple boxplot(D) does not work and error messages come up;

Integers can only be combined with integers of the same class, or scalar doubles.

Any ideas

[Star Strider]

Reference — Trying to find the min non-zero value of a [925x902] matrix

Answer 1

[Cris LaPierre]

MATLAB will treat each column as a separate data series.

A = rand(10,5);
boxchart(A)

If you want to only have a single boxplot containing all the data, use the colon operator to turn your matrix data into a vector.

figure
boxchart(A(:))

By the way, I'm using boxchart here, which is in base MATLAB, as opposed to boxplot, which requires the Statistics and Machine Learning toolbox. This approach will work with either.

[Todd Pierce]

thank you,

however when i run this i still get an error message

"Warning: Error updating BoxChart.

Integers can only be combined with integers of the same class, or scalar doubles."

Any ideas what this means and how to get around it?

[Cris LaPierre]

I suspect you must have mixed datatypes. You could try using the double function to convert all values to double (see this answer).

To provide a specific answer for you, it would be helpful if you could share your data. You can save it to a mat file and attach it using the paperclip icon.

[Todd Pierce]

here is the data, the grid in queestion is labelled inside as D1.Z

[Cris LaPierre]

How do you create D1? When I try to load the mat file I get the following warning:

Warning: Variable 'D1' originally saved as a GRIDobj cannot be instantiated as an object and will be read in as a uint32.

[Todd Pierce]

here it is sorry

[Cris LaPierre]

However you extracted A is probably the same thing you need to do to fix the error you are seeing.

load A.mat
boxplot(A(:))

figure
boxchart(A(:))

[Todd Pierce]

Thank you this works smoothly now