MATLAB: Issue plotting boxplot using data from data frame

boxplotcelldataframevisualisation

Hello all,

I have a dataframe 'Newdata'.

I want to create a boxplot with 5 categories of the independent variable 'Religiosity' and the continous dependent variable 'Spatial Memory'. Thus, there should be five boxplots overall, one for each category of the independent variable 'religiosity'.

I have tried using the boxplot function – boxplot(Newdata, 'whisker',1.5) but this is giving me the error:

'X' parameter must be a numeric vector or matrix.

Would anyone be able to give me a helping hand as to how I can do this using the dataframe I have?

I have attached a screenshot below.

Thanks!

Best Answer

Hi Emre,

You are getting the error as NewData variable is a cell array whereas boxplot requires it to be a matrix.

To resolve the error you need to convert the cell array to matrix.

I would suggest you to first extract the indices of individual types using this answer.

After the extraction, get the respective values and store in a matrix.

Then you can call the boxplot.

Hope it helps

Related Solutions

MATLAB: Putting similar numbers into groups within an array

If you have the Statistics and Machine Learning Toolbox (for pdist2) and the Image Processing Toolbox (for bwlabel), you can do this:

m = [...
7340.1
7340.3
7340.6
7349.0
7349.4
7358.0
7358.1
7358.2
7358.7]
% % New groups would look like follows:
% % Group 1
% 7340.1
% 7340.3
% 7340.6
% % Group 2
% 7349.0
% 7349.4
% % Group 3
% 7358.0
% 7358.1
% 7358.2
% 7358.7]
% First sort m so that close by ones has adjacent indexes.
m = sort(m, 'ascend')
% Get distance of every element to every other element.
distances = pdist2(m, m)
% Find out which pairs are within 2 of each other.
within2 = distances > 0 & distances < 2
% Erase upper triangle to get rid of redundancy
numElements = numel(m);
t = logical(triu(ones(numElements, numElements), 0))
within2(t) = 0
% Label each group with an ID number.
[labeledGroups, numGroups] = bwlabel(within2)
% Put each group into a cell array
for k = 1 : numGroups
  [rows, columns] = find(labeledGroups == k);
  indexes = unique([rows, columns]);
  groups{k} = m(indexes);
end
celldisp(groups); % Display the results in the command window.

It gives you your desired result. Should work for other arrays also, though I didn't test it with any others.

MATLAB: Isn’t ‘whisker’ recognized as a valid parameter when using the BOXPLOT function in the Statistics Toolbox 5.0 (R14)

This bug has been fixed for Release 14 SP1 (R14SP1). For previous releases, please read below for any possible workarounds:

We have verified that there is a bug in the Statistics Toolbox 5.0 (R14) in the way that the BOXPLOT function handles the 'whisker' parameter. To work around this issue, change the line of $MATLAB/toolbox/stats/boxplot.m that reads:

okargs =   {'notch' 'symbol' 'orientation' 'whis' 'labels'};

to:

okargs =   {'notch' 'symbol' 'orientation' 'whisker' 'labels'};

Best Answer

Related Solutions

MATLAB: Putting similar numbers into groups within an array

MATLAB: Isn’t ‘whisker’ recognized as a valid parameter when using the BOXPLOT function in the Statistics Toolbox 5.0 (R14)

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