Does any one know why the help result does not appear?

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Ameligege
Ameligege 2015-3-2
评论： Andrew Newell 2015-3-4
I searched about the same thing twice in mat lab help . the first one the result appears now It does not Why??????????????
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Image Analyst
Image Analyst 2015-3-4
Exactly what do you mean by the "help text box"? Is it the "Search Documentation" edit field, like this:
where you click where it says "Search Documentation" and then it will change to be the letters you type? Or do you mean the command line prompt indicated by the >> in the command window?
What does it say when you type in something like plot? Do you see a list of possible matches, like this:

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Stephen23
Stephen23 2015-3-4
编辑：Stephen23 2015-3-4
The function knnclassify is part of the Bioinformatics Toolbox. It may be that this toolbox is no longer accessible to you.
  • have you changed computer ?
  • has your MATLAB license changed ?
  • have you changed your MATLAB installation ?
  • has the search path been changed?
For a start, type ver in your command window, and tell us exactly what is printed. If the Bioinformatics Toolbox is not listed, then this is the reason why the help cannot find it.
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Ameligege
Ameligege 2015-3-4
I clicked uninstall matlab from control panel and after a few second I clicked Cancel.
Andrew Newell
Andrew Newell 2015-3-4
In that case, who knows what state your installation is in? Sounds like you should complete the uninstallation and then reinstall MATLAB.

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Stephen23
Stephen23 2015-3-4
编辑：Stephen23 2015-3-4
Lets read that message more closely:
"No results for knnclaasify. Please try again."
This is interesting: the name that you searched for "knnclaasify" is a misspelling of "knnclassify": in particular an s has been swapped for an a.
MATLAB's help, for better or for worse, does not fix spelling mistakes or make suggestions for alternative searches (like many online search engines do). It searches for exactly the word that is typed in the textfield.
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Image Analyst
Image Analyst 2015-3-4
You probably need to uninstall and reinstall to the new location. In general, you usually can't just click and drag a folder (your MATLAB installation folder with the matlab.exe file) to a new location and expect the program (MATLAB) inside the folder to behave like it did before.

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Image Analyst
Image Analyst 2015-3-4
So you say plot() shows up in the help search box but you said that results don't after you've done it once: "the first one the result appears now It does not" . Very strange.
If you're using Windows, please capture your screen shots using PSR.exe. Type psr into the Start->"Search programs and files" and then run psr. Then do your steps in MATLAB and stop recording and save the screenshots into a zip file, then attach the zip file here with the paper clip icon so we can see screenshot-by-screenshot exactly what you're doing.

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