Why help on 'str' yield help on 'std'?

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Alon Rozen
Alon Rozen 2017-1-29
评论： Steven Lord 2017-1-30
Hi all,
When I want to check if a name for a new variable I want to use is already part of Matlab language I just seek help on that word (hopping to get 'word' not found). I guess this is a common practice.
I tried to use this technique with the word 'Str' (short name for a string) and got help on the known function 'std'. Either it is a bug or part of Matlab attempt to guess typos. In both cases, it doesn't help...
Is it a typo correction? Is it a bug?
Thanks,
Alon
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Walter Roberson
Walter Roberson 2017-1-29
Yes, occasionally MATLAB does clean up typos or redirect one word to the MATLAB equivalent of that concept. On occasion (not often) I have seen it direct to help that contained a copy of the word I had typed in.

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Stephen23
Stephen23 2017-1-29
编辑：Stephen23 2017-1-29
Don't use help to check if a name is already used: the best function for this is which:
which str
which str -all
For example:
>> which str
'str' not found.
>> which std
C:\Program Files\MATLAB\R2010b\toolbox\matlab\datafun\std.m
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Stephen23
Stephen23 2017-1-29
@Alon Rozen: I suspect that help is trying to, err, help, by providing some spelling correction.
Steven Lord
Steven Lord 2017-1-30
This feature was introduced in release R2015b. It is not a bug.

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