why does the imaginary part show?

Hi, I use matlab to calcuate something for me, and the expressions is

pf=edw*([d12-coef1^(1/r)*d11,d22-coef1^(1/r)*d21;...
    d13-coef2^(1/r)*d11,d23-coef2^(1/r)*d21]\[coef1^(1/r)-1;coef2^(1/r)-1]);

all the parameters are read in from the excel file. But I always get the answers with the form like this [2.167347704427648e+03 + 0.000000000000000e+00i, 2.415785715277585e+03 + 0.000000000000000e+00i]. As I already check about the parameters, they shouldn't produce complex numbers. But why instead the answers containing imaginary part*0?

Answer 1

[Image Analyst]

What are the values of all the variables? You forgot to tell us. Also, why is there a ... after the semicolon that terminates line #1? This makes the next line not considered when calculating pf - don't know if you want it to be or not.