i and j pass isnan test?

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Eathan Baumgartner
Eathan Baumgartner 2018-8-10
评论： Stephen23 2018-8-10
I have code which extracts data from a gui entry as follows:
handles.bonusI = get(handles.bonusEB,'string');
handles.bonusI = str2double(handles.bonusI);
if isnan(handles.bonusI) == 0
Code executes
else
error displays
end
For every character I have tested that are not numbers, an error will be displayed. Except i and j. When testing handles.bonus, I both hold the value of 0.0000 + 1.0000i. I have no idea why this is, anyone got a clue?

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回答（1 个）

Image Analyst
Image Analyst 2018-8-10
i and j, as strings in your edit text box, can be passed to str2double() as a special case, but other character strings can't unless the string is all numbers. See this demo:
>> str2double('i')
ans =
0 + 1i
>> str2double('a')
ans =
NaN

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