mat2str() on complex values with 0 inaginary part

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Firan Lucian
Firan Lucian 2021-1-26
编辑： Jan 2021-1-26
Hi,
Tried mat2str(complex(5,6)) witch seems ok:
ans =
'5+6i'
But other complex values with imaginary part 0 or 0+0i are printed as real values:
mat2str(complex(5,0))
ans =
'5'
mat2str(0+0i)
Seems incorect to me, is this a bug ?

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采纳的回答

Jan
Jan 2021-1-26
编辑：Jan 2021-1-26
Mathematically 5 is the same as 5+0i, so the output is correct.
So omitting the imaginary part is a question of taste.
If you want to display it, do this expliticitly:
x = 1 + 2i;
sprintf('%g %gi', real(x), imag(x))
Alternatively you can copy the code of mat2str to e.g. mat2stri anywhere in your user-defined folders in the path and remove the line:
imagStr(imagVal == 0) = "";

更多回答（2 个）

Firan Lucian
Firan Lucian 2021-1-26
~isreal(complex(5,0))
ans =
logical
1
~isreal(5)
ans =
logical
0
Steven Lord
Steven Lord 2021-1-26
Ran in:
Not a bug. Many operations in MATLAB, if the result has an all zero imaginary part, will remove that imaginary part. complex is one of the few operations that does not by design.
x = complex(5, 0)
x = 5.0000 + 0.0000i
y = x(1)
y = 5
z = x + 0
z = 5
  1 个评论
Firan Lucian
Firan Lucian 2021-1-26
I don't like this output inconsistency, as this functions may provide some human readable string; that should contain, not hide, the complex storage, but this is my opinion…
(maybe some extra options could help ...,'complex', true)

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