MATLAB: WHAT ARE THE CORRECT RESPONSES TO THE FOLLOWING HELP QUERIES ?

 ver
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 MATLAB Version: 9.4.0.813654 (R2018a)
 MATLAB License Number: 
 Operating System: Microsoft Windows 10 Pro Version 10.0 (Build 17134)
 Java Version: Java 1.8.0_144-b01 with Oracle Corporation Java HotSpot
 (TM) 64-Bit Server VM mixed mode
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 help sys         sys not found.
 help SYS         SYS not found.

 help lsim        help for lsim
 help LSIM        help for lsim

 help lstm        lstm not found
 help LSTM        help for lsim <==== WRONG

 help gpu         gpu is a folder.
 help GPU         gpu is a folder.(GEH: why is gpu BOLD here?)

 help cpu         --- help for pi ---
                 pi     3.1415926535897....
                 pi = 4*atan(1) = imag(log(-1)) = ...
                      3.1415926535897....

                 Reference page for pi

 help CPU        CPU not found.

 help os         os not found.
 help OS         OS not found

[Rik]

I don't really understand your question. Do you want confirmation of this on different releases? On different OSes but same release? Or are you looking for the reason of the inconsistent responses?

Answer 1

[Steven Lord]

MATLAB started suggesting corrections for mistyped functions or variable names in the Command Window in release R2012b. That suggestion functionality was expanded to calls to help in release R2015b and to the Live Editor in release R2017a. See the Release Notes for more information.

The fact that help lstm and help LSTM behave differently does seem odd. I've entered that into the bug database.

I was not able to reproduce the behavior you saw with help cpu. Is it possible you have an Add-On that has a package folder +cpu that has only a function named pi or something like that?

In general if you have situations where you feel MATLAB gave the wrong suggestion or there is a better suggestion it should have given, please send that feedback to Technical Support so they can pass it along to the developers responsible for the correction suggestion functionality as a bug or an enhancement.

As for why gpu is in bold in certain circumstances, I believe that's because when we used to highlight the name of the function in the help text in ALL CAPS it would cause users to receive an error when they tried to copy and paste a section of the syntax from the help text. When help sees the name of a function in ALL CAPS in its help text file, it now displays it in bold instead to make it stand out visually while still being "functional" when copied and pasted. [I don't remember when this started offhand.]