isa

Syntax

R = isa(v, class)

Inputs

v

Given input variable.

class

Class name to check for. In addition to specific class names, class can also have the following values:

'integer': Returns true if v is an integer.
'float': Returns true if v is a scalar.
'double': Returns true if v is a scalar.
'numeric': Returns true if v is an integer or a scalar.

Type: string | cell

Outputs

R: R is true if v belongs to class. If class is of type cell, R will also be of type cell, with the same size as R and each element containing the result of the isa command.; Type: logical | cell

Examples

Logical output example, checking for subclass:

classdef shape
    properties
        color
    end
    methods
        function s=shape(color1)
          s.color = color1;
        end
        function disp(s)
            fprintf('The shape has color %s\n',     s.color);
        end
    end
end

classdef circle < shape
	properties
		r
	end

	methods
		function c = circle(radius, color)
			c = c@shape(color); % Special construct for instantiating the superclass
			c.r = radius;
		end

		function disp(c)
			disp@shape(c); % Call the superclass display first (optional)
			fprintf('Radius = %f\n',c.r);
		end
	end
end
c = circle(3,'blue');
R1 = isa(c, 'circle')
R2 = isa(c, 'shape')

R1 = 1
R2 = 1

Cell output example:

R = isa([1;2;3], {'double', 'float', 'integer', 'numeric', 'foo'})

R =
{
  [1,1] 1
  [1,2] 1
  [1,3] 0
  [1,4] 1
  [1,5] 0
}