Plot Categorical Data
This example shows how to plot data from a categorical array.
Load Sample Data
Load sample data gathered from 100 patients.
loadpatientswhos
Name Size Bytes Class Attributes Age 100x1 800 double Diastolic 100x1 800 double Gender 100x1 12212 cell Height 100x1 800 double LastName 100x1 12416 cell Location 100x1 15008 cell SelfAssessedHealthStatus 100x1 12340 cell Smoker 100x1 100 logical Systolic 100x1 800 double Weight 100x1 800 double
Create Categorical Arrays from Cell Arrays of Character Vectors
The workspace variable,Location
, is a cell array of character vectors that contains the three unique medical facilities where patients were observed.
To access and compare data more easily, convertLocation
to a categorical array.
Location = categorical(Location);
Summarize the categorical array.
summary(Location)
County General Hospital 39 St. Mary's Medical Center 24 VA Hospital 37
39 patients were observed at County General Hospital, 24 at St. Mary's Medical Center, and 37 at the VA Hospital.
The workspace variable,SelfAssessedHealthStatus
, contains four unique values,Excellent
,Fair
,Good
, andPoor
.
ConvertSelfAssessedHealthStatus
to an ordinal categorical array, such that the categories have the mathematical orderingPoor < Fair < Good < Excellent
.
SelfAssessedHealthStatus = categorical(SelfAssessedHealthStatus,...{'Poor''Fair''Good''Excellent'},'Ordinal',true);
Summarize the categorical array,SelfAssessedHealthStatus
.
summary(SelfAssessedHealthStatus)
Poor 11 Fair 15 Good 40 Excellent 34
Plot Histogram
Create a histogram bar plot directly from a categorical array.
figure histogram(SelfAssessedHealthStatus) title('Self Assessed Health Status From 100 Patients')
The functionhistogram
accepts the categorical array,SelfAssessedHealthStatus
, and plots the category counts for each of the four categories.
Create a histogram of the hospital location for only the patients who assessed their health asFair
orPoor
.
figure histogram(Location(SelfAssessedHealthStatus<='Fair')) title('Location of Patients in Fair or Poor Health')
Create Pie Chart
Create a pie chart directly from a categorical array.
figure pie(SelfAssessedHealthStatus); title('Self Assessed Health Status From 100 Patients')
The functionpie
accepts the categorical array,SelfAssessedHealthStatus
, and plots a pie chart of the four categories.
Create Pareto Chart
Create a Pareto chart from the category counts for each of the four categories ofSelfAssessedHealthStatus
.
figure A = countcats(SelfAssessedHealthStatus); C = categories(SelfAssessedHealthStatus); pareto(A,C); title('Self Assessed Health Status From 100 Patients')
The first input argument topareto
must be a vector. If a categorical array is a matrix or multidimensional array, reshape it into a vector before callingcountcats
andpareto
.
Create Scatter Plot
Convert the cell array of character vectors to a categorical array.
Gender = categorical(Gender);
Summarize the categorical array,Gender
.
summary(Gender)
Female 53 Male 47
Gender
is a 100-by-1 categorical array with two categories,Female
and男性
.
Use the categorical array,Gender
, to accessWeight
andHeight
为每个数据gender separately.
X1 = Weight(Gender=='Female'); Y1 = Height(Gender=='Female'); X2 = Weight(Gender=='Male'); Y2 = Height(Gender=='Male');
X1
andY1
are 53-by-1 numeric arrays containing data from the female patients.
X2
andY2
are 47-by-1 numeric arrays containing data from the male patients.
Create a scatter plot of height vs. weight. Indicate data from the female patients with a circle and data from the male patients with a cross.
figure h1 = scatter(X1,Y1,'o'); holdonh2 = scatter(X2,Y2,'x'); title('Height vs. Weight') xlabel('Weight (lbs)') ylabel('Height (in)')
See Also
bar
|categorical
|countcats
|histogram
|pie
|rose
|scatter
|summary