How to combine array columns to form complex number?

Question

Ted Baker 2019-12-18

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https://ww2.mathworks.cn/matlabcentral/answers/497257-how-to-combine-array-columns-to-form-complex-number

评论： Stephen23 2019-12-18

I'm trying to combine two columns from two arrays to form a complex number. I know I can create a complex number using the complex(a,b) function and I think I am correct in addressing each column in the two arrays as S21real(:,2) and S21imag(:,2). As a results my code looks like

S21complex = complex(S21real(:,2), S21imag(:,2));

Where my data looks like

S21real:

690000000	0.00854245859320000	0
690193750	0.00915901995335000	0
690387500	0.00963277694145000	0

S21imag:

690000000	0.00854245859320000	0
690193750	0.00915901995335000	0
690387500	0.00963277694145000	0

However, when I run the code, I get the following error:

Error using complex
Real input A must be numeric, real, and full.

Can anyone shed some light as to where I am going wrong?

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Ted Baker 2019-12-18

I'm in 2019b too. :/ Here is my full code. I've attached the two full data files.

I am 99% sure I am working in the correct directory, etc.

% Parameters
filenamei = 'S21_I_BOOT_DRIVER_DIRECT.CSV';
filenamer = 'S21_R_BOOT_DRIVER_DIRECT.CSV';
S21imag = readtable(filenamei, 'HeaderLines', 3);
S21real = readtable(filenamer, 'HeaderLines', 3);
S21complex = complex(S21real(:,2), S21imag(:,2));

Stephen23 2019-12-18

You use parentheses to access the two S21xxx tables, which the MATLAB documentation

https://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-table.html

makes clear, returns a table. But complex is not defined for table inputs.

To get the contents of that table (e.g. a numeric array) you need to use the correct indexing: curly braces {} or dot notation with the specific variable names.

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