MATLAB: How to convert a scalar data into complex

complexscalar

 I have 3 coloumns of scalar data, each coloumn belongs to the data of a particular parameter. I have to plot the three parameters in a contour figure. Before that I have to convert the scalar data into a complex one. How shall I do this?

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A scalar can be complex by definition. A scalar is just a number. So I'm assuming you have real-valued data to start with. How are you going to determine the imaginary part?

You can simply make the attribute complex by

   z = randn(100,3);
   z = complex(z);

but to actually give it some meaningful imaginary part, you have to some way to assign it.

z = randn(100,3);
z = z+1j*ones(size(z));

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MATLAB: How to initialize a complex array to zeros in MATLAB

A complex number can be created in MATLAB using the COMPLEX function. To initialize a complex number with zero as the real part and non-zero imaginary part, enter the following at the MATLAB command prompt

a = zeros(1,100);
x = complex(a,0);

To verify that the above command actually creates a 100-by-1 complex array, enter the following at the MATLAB command prompt

whos x

If you were to create the complex arrary with the above code and then assign a pure real number to one part of x or perform an arithmetic operation with a real number, MATLAB will de-allocate the complex part of the variable x . Type the following commands to observe this behavior:

x = x + 1.0;
whos x

When a real number, 1.0 was added to x, MATLAB de-allocates the complex part of the variable x and creates a 100-by-1 real double array. To keep the complex part, wrap COMPLEX around the expression.

MATLAB: Hermitian transpose of a vector with complex elements

out = A'; % A - your data

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MATLAB: How to initialize a complex array to zeros in MATLAB

MATLAB: Hermitian transpose of a vector with complex elements

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