Undefined function 'ismissing' for input arguments of type 'double'.
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When I was practicing 'ismissing', there was an error, shown below:
A = [3 NaN 5 6 7 NaN NaN 9]; TF = ismissing(A)
Undefined function 'ismissing' for input arguments of type 'double'.
How can I deal with it?
采纳的回答
Jan
2017-8-5
The function ismissing was introduced in 2013b. See https://www.mathworks.com/help/matlab/ref/ismissing.html, at the bottom. You can find such information by asking an internet search engine for "Matlab ismissing".
Workaround:
A = [3 NaN 5 6 7 NaN NaN 9];
TF = isnan(A)
5 个评论
YUXUAN CHEN
2017-8-7
YUXUAN CHEN
2017-8-8
编辑：Walter Roberson
2017-8-9
Jan
2017-8-9
isnan is an important Matlab command and it is included in R2017a also, see https://www.mathworks.com/help/matlab/ref/isnan.html. You can find a link to the docs also, when you scroll down in the doc of ismissing and look into the "See also" line.
The MathWorks care for the backward compatibility of Matlab functions. There is a very small number of commands and features, which have been removed. You find such changes in the Release Histroy in the documentation. In many docs, it is mentioned now, when the function was introduced. But the list of changes could be more detailed.
Walter Roberson
2017-8-9
isnan has existed for as far back as the available documentation goes, and still exists. http://www.mathworks.com/help/releases/R13sp2/techdoc/ref/isnan.html?s_tid=srchtitle
ismissing existed in R2013b; see http://www.mathworks.com/help/releases/R2013b/matlab/ref/ismissing.html and http://www.mathworks.com/help/releases/R2013b/stats/dataset.ismissing.html
YUXUAN CHEN
2017-8-10
更多回答（1 个）
deng xifei
2017-8-5
0 个投票
Hi
you should know that the type of input variable for function ismissing should be dataSet, not a vector. And you are trying to take a matrix as the input, so you get the error tips.
2 个评论
YUXUAN CHEN
2017-8-7
Walter Roberson
2017-8-7
This advice is not correct. ismissing() is defined for at least the following data types:
- double, single;
- char, string, cell of character vectors;
- duration, calendarDuration, datetime;
- categorical
and possibly others.
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