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

I searched about the same thing twice in mat lab help . the first one the result appears now It does not Why??????????????

[Ameligege]

until now No Answer :(

[Adam]

You need to phrase a more specific question. How is anybody supposed to understand what you are asking given how you have phrased it? You haven't told us what happens or exactly what you did. Do you mean you opened the Help browser within Matlab or typed

doc somethingOrOther

at the command line?

[Ameligege]

when I write any thing in the help text box.There is no result and I am sure it is there because I searched about same thing before and the result appears. this is when I typed knnclassify in the help text box. "No results for knnclaasify. Please try again."

[Andrew Newell]

Ameligege, do you get an answer if you type

which knnclassify

in the command window?

[Ameligege]

>> which knnclassify
C:\Program Files\MATLAB\R2013a\toolbox\bioinfo\biolearning\knnclassify.m

this is the result

[Image Analyst]

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:

[Ameligege]

yes

Answer 1

[Stephen23]

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.

[Ameligege]

>> ver
-------------------------------------------------------------------------------------------------------
MATLAB Version: 8.1.0.604 (R2013a)
MATLAB License Number: ••••••
Operating System: Microsoft Windows 7 Version 6.1 (Build 7600)
Java Version: Java 1.6.0_17-b04 with Sun Microsystems Inc. Java HotSpot(TM) 64-Bit Server VM mixed mode
-------------------------------------------------------------------------------------------------------
MATLAB                                                Version 8.1        (R2013a)
Simulink                                              Version 8.1        (R2013a)
Aerospace Blockset                                    Version 3.11       (R2013a)
Aerospace Toolbox                                     Version 2.11       (R2013a)
Bioinformatics Toolbox                                Version 4.3        (R2013a)
Communications System Toolbox                         Version 5.4        (R2013a)
Computer Vision System Toolbox                        Version 5.2        (R2013a)
Control System Toolbox                                Version 9.5        (R2013a)
Curve Fitting Toolbox                                 Version 3.3.1      (R2013a)
DO Qualification Kit                                  Version 2.1        (R2013a)
DSP System Toolbox                                    Version 8.4        (R2013a)
Data Acquisition Toolbox                              Version 3.3        (R2013a)
Database Toolbox                                      Version 4.1        (R2013a)
Datafeed Toolbox                                      Version 4.5        (R2013a)
Econometrics Toolbox                                  Version 2.3        (R2013a)
Embedded Coder                                        Version 6.4        (R2013a)
Filter Design HDL Coder                               Version 2.9.3      (R2013a)
Financial Instruments Toolbox                         Version 1.1        (R2013a)
Financial Toolbox                                     Version 5.1        (R2013a)
Fixed-Point Designer                                  Version 4.0        (R2013a)
Fuzzy Logic Toolbox                                   Version 2.2.17     (R2013a)
Global Optimization Toolbox                           Version 3.2.3      (R2013a)
HDL Coder                                             Version 3.2        (R2013a)
HDL Verifier                                          Version 4.2        (R2013a)
IEC Certification Kit                                 Version 3.1        (R2013a)
Image Acquisition Toolbox                             Version 4.5        (R2013a)
Image Processing Toolbox                              Version 8.2        (R2013a)
Instrument Control Toolbox                            Version 3.3        (R2013a)
MATLAB Builder EX                                     Version 2.3.1      (R2013a)
MATLAB Builder JA                                     Version 2.2.6      (R2013a)
MATLAB Builder NE                                     Version 4.1.3      (R2013a)
MATLAB Coder                                          Version 2.4        (R2013a)
MATLAB Compiler                                       Version 4.18.1     (R2013a)
MATLAB Distributed Computing Server                   Version 6.2        (R2013a)
MATLAB Report Generator                               Version 3.14       (R2013a)
Mapping Toolbox                                       Version 3.7        (R2013a)
Model Predictive Control Toolbox                      Version 4.1.2      (R2013a)
Model-Based Calibration Toolbox                       Version 4.6        (R2013a)
Neural Network Toolbox                                Version 8.0.1      (R2013a)
OPC Toolbox                                           Version 3.2        (R2013a)
Optimization Toolbox                                  Version 6.3        (R2013a)
Parallel Computing Toolbox                            Version 6.2        (R2013a)
Partial Differential Equation Toolbox                 Version 1.2        (R2013a)
Phased Array System Toolbox                           Version 2.0        (R2013a)
RF Toolbox                                            Version 2.12       (R2013a)
Real-Time Windows Target                              Version 4.2        (R2013a)
Robust Control Toolbox                                Version 4.3        (R2013a)
Signal Processing Toolbox                             Version 6.19       (R2013a)
SimBiology                                            Version 4.3        (R2013a)
SimDriveline                                          Version 2.4        (R2013a)
SimElectronics                                        Version 2.3        (R2013a)
SimEvents                                             Version 4.3        (R2013a)
SimHydraulics                                         Version 1.12       (R2013a)
SimMechanics                                          Version 4.2        (R2013a)
SimPowerSystems                                       Version 5.8        (R2013a)
SimRF                                                 Version 4.0        (R2013a)
Simscape                                              Version 3.9        (R2013a)
Simulink 3D Animation                                 Version 6.3        (R2013a)
Simulink Code Inspector                               Version 1.3        (R2013a)
Simulink Coder                                        Version 8.4        (R2013a)
Simulink Control Design                               Version 3.7        (R2013a)
Simulink Design Optimization                          Version 2.3        (R2013a)
Simulink Design Verifier                              Version 2.4        (R2013a)
Simulink PLC Coder                                    Version 1.5        (R2013a)
Simulink Report Generator                             Version 3.14       (R2013a)
Simulink Verification and Validation                  Version 3.5        (R2013a)
Spreadsheet Link EX                                   Version 3.1.7      (R2013a)
Stateflow                                             Version 8.1        (R2013a)
Statistics Toolbox                                    Version 8.2        (R2013a)
Symbolic Math Toolbox                                 Version 5.10       (R2013a)
System Identification Toolbox                         Version 8.2        (R2013a)
SystemTest                                            Version 2.6.5      (R2013a)
Trading Toolbox                                       Version 1.0        (R2013a)
Vehicle Network Toolbox                               Version 2.0        (R2013a)
Wavelet Toolbox                                       Version 4.11       (R2013a)
xPC Target                                            Version 5.4        (R2013a)
xPC Target Embedded Option                            Version 5.4        (R2013a)
>>

[Ameligege]

I almost uninstall MATLAB but I did not complete it,Could this be the reason؟

[Andrew Newell]

It could well be. What do you mean by "almost uninstall"?

[Ameligege]

I clicked uninstall matlab from control panel and after a few second I clicked Cancel.

[Andrew Newell]

In that case, who knows what state your installation is in? Sounds like you should complete the uninstallation and then reinstall MATLAB.

Answer 2

[Stephen23]

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.

[Ameligege]

even if I did exactly what you say the same result

No results for knnclassify. Please try again.

[Ameligege]

I told you that It was working before I am sure about that .May be because I change the path of my matlab file I was on C disk .and I changed it to D

[Image Analyst]

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.

[Ameligege]

this is screen capture for the result

Answer 3

[Image Analyst]

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.