Define a 3-by-4 matrix,A.

A = [7 3+4i 2 5i;...2i 1+3i 12 345;...52 108 78 3];

Determine whether the array is real.

tf = isreal(A)

tf =logical0

自从Acontains complex elements,isrealreturns false.

Use thecomplexfunction to create a scalar,A, with zero-valued imaginary part.

A = complex(12)

A = 12.0000 + 0.0000i

Determine whetherA是真实的。

tf = isreal(A)

tf =logical0

A不是真正的因为it has an imaginary part, even though the value of the imaginary part is0.

Determine whetherAcontains any elements with zero-valued imaginary part.

~any(imag(A))

ans =logical1

A包含具有零值虚构部分的元素。

Define two complex scalars,x和y.

x=3+4i; y=5-4i;

Determine whether the addition of two complex scalars,x和y, is real.

A = x+y

A = 8

MATLAB® drops the zero imaginary part.

isreal(A)

ans =logical1

Ais real since it does not have an imaginary part.

Create a cell array.

C{1,1} = pi;% doubleC{2,1} ='John Doe';% char arrayC{3,1} = 2 + 4i;% complex doubleC{4,1} = ispc;% logicalC{5,1} = magic(3);% double arrayC{6,1} = complex(5,0)% complex double

C =6×1 cell array[ 3.1416] 'John Doe' [2.0000 + 4.0000i] [ 0] [3×3 double] [5.0000 + 0.0000i]

Cis a 1-by-6 cell array.

Loop over the elements of a cell array to distinguish between real and complex elements.

fork = 1:6 x(k,1) = isreal(C{k,1});endx

x =6×1 logical array1 1 0 1 1 0

All butC{3,1}和C{6,1}are real arrays.