Load a sample of predicted and true labels for a classification problem. trueLabels is the true labels for an image classification problem and predictedLabels is the predictions of a convolutional neural network.

load('Cifar10Labels.mat','trueLabels','predictedLabels');

Create a confusion matrix chart.

figure
cm = confusionchart(trueLabels,predictedLabels);

Modify the appearance and behavior of the confusion matrix chart by changing property values. Add column and row summaries and a title. A column-normalized column summary displays the number of correctly and incorrectly classified observations for each predicted class as percentages of the number of observations of the corresponding predicted class. A row-normalized row summary displays the number of correctly and incorrectly classified observations for each true class as percentages of the number of observations of the corresponding true class.

cm.ColumnSummary = 'column-normalized';
cm.RowSummary = 'row-normalized';
cm.Title = 'CIFAR-10 Confusion Matrix';

You can use confusionchart to create a confusion matrix chart from a numeric confusion matrix.

Load a sample confusion matrix m and the associated class labels classLabels.

load('Cifar10ConfusionMat.mat','m','classLabels');
m

m = 10×10

   923     4    21     8     4     1     5     5    23     6
     5   972     2     0     0     0     0     1     5    15
    26     2   892    30    13     8    17     5     4     3
    12     4    32   826    24    48    30    12     5     7
     5     1    28    24   898    13    14    14     2     1
     7     2    28   111    18   801    13    17     0     3
     5     0    16    27     3     4   943     1     1     0
     9     1    14    13    22    17     3   915     2     4
    37    10     4     4     0     1     2     1   931    10
    20    39     3     3     0     0     2     1     9   923

classLabels

classLabels = 10x1 categorical
     airplane 
     automobile 
     bird 
     cat 
     deer 
     dog 
     frog 
     horse 
     ship 
     truck 

Create a confusion matrix chart from the numeric confusion matrix and the class labels.

cm = confusionchart(m,classLabels);

Load a sample of predicted and true labels for a classification problem. trueLabels are the true labels for an image classification problem and predictedLabels are the predictions of a convolutional neural network. Create a confusion matrix chart with column and row summaries

load('Cifar10Labels.mat','trueLabels','predictedLabels');
figure
cm = confusionchart(trueLabels,predictedLabels, ...
    'ColumnSummary','column-normalized', ...
    'RowSummary','row-normalized');

To sort the classes of the confusion matrix by class-wise recall (true positive rate), normalize the cell values across each row, that is, by the number of observations that have the same true class. Sort the classes by the corresponding diagonal cell values and reset the normalization of the cell values. The classes are now sorted such that the percentages in the blue cells in the row summaries to the right are decreasing.

cm.Normalization = 'row-normalized';
sortClasses(cm,'descending-diagonal');
cm.Normalization = 'absolute';

To sort the classes by class-wise precision (positive predictive value), normalize the cell values across each column, that is, by the number of observations that have the same predicted class. Sort the classes by the corresponding diagonal cell values and reset the normalization of the cell values. The classes are now sorted such that the percentages in the blue cells in the column summaries at the bottom are decreasing.

cm.Normalization = 'column-normalized';
sortClasses(cm,'descending-diagonal');
cm.Normalization = 'absolute';