mustBeNonsparse

Validate that value is nonsparse

Syntax

mustBeNonsparse(value)

Description

mustBeNonsparse(value) throws an error if value is sparse. If value is empty, the function does not throw an error. This function does not return a value.

mustBeNonsparse calls the issparse function to determine if the input is sparse.

Class support: All numeric classes, logical, and MATLAB^® classes that overload issparse.

Examples

Validate That Input Is Not Sparse

Use mustBeNonsparse to validate that the input is nonsparse.

Use the sparse function to create a sparse matrix.

A = [ 0   0   0   5
      0   2   0   0
      1   3   0   0
      0   0   4   0];
S = sparse(A);

Validate that S is nonsparse.

mustBeNonsparse(S)

Value must not be sparse.

Restrict Property Values

This class restricts the value of Prop1 to nonsparse values.

classdef MyClass
   properties
      Prop1 {mustBeNonsparse}
   end
end

Create an object and assign a value to its property.

obj = MyClass;
A = [ 0   0   0   5
      0   2   0   0
      1   3   0   0
      0   0   4   0];
obj.Prop1 = sparse(A);

Error setting property 'Prop1' of class 'MyClass'. Value must not be sparse.

When you assign a value to the property, MATLAB calls mustBeNonsparse with the value being assigned to the property. mustBeNonsparse issues an error because the value assigned to Prop1 is sparse.

Restrict Function Argument Values

This function restricts the input argument to be any nonsparse value.

function mbNonsparse(S)
    arguments
        S {mustBeNonsparse}
    end
    disp(S)
end

Calling this function with a sparse array results in an error thrown by mustBeNonsparse.

A = [ 0   0   0   5
      0   2   0   0
      1   3   0   0
      0   0   4   0];
S = sparse(A);
mbNonsparse(S)

Error using mbNonsparse (line 3)
 mbNonsparse(S)
             ^
Invalid argument at position 1. Value must not be sparse.

Input Arguments

value — Value to validate

scalar | array

Value to validate, specified as a scalar or array of any one of these types:

• logical or numeric class

• MATLAB classes that overload issparse

Other data types cause an error.

Data Types: single | double | int8 | int16 | int32 | int64 | uint8 | uint16 | uint32 | uint64 | logical
Complex Number Support: Yes

Tips

• mustBeNonsparse is designed to be used for property and function argument validation.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.

GPU Arrays

Accelerate code by running on a graphics processing unit (GPU) using Parallel Computing Toolbox™.

The mustBeNonsparse function fully supports GPU arrays. To run the function on a GPU, specify the input data as a gpuArray (Parallel Computing Toolbox). For more information, see Run MATLAB Functions on a GPU (Parallel Computing Toolbox).

Distributed Arrays

Partition large arrays across the combined memory of your cluster using Parallel Computing Toolbox™.

This function fully supports distributed arrays. For more information, see Run MATLAB Functions with Distributed Arrays (Parallel Computing Toolbox).

Version History

Introduced in R2017a