MATLAB Answers


Why can't I access Toolbox functions

Asked by ChiPhi85 on 17 Nov 2018
Latest activity Edited by Akshay Khadse on 20 Nov 2018
I have searched the usual channels and not found an answer. I am trying to access functions in the Image Processing Toolbox but they are undefined.
Other answers on here have led me to do some checks and I have found:
1) The toolbox is installed.
2) I have a licence for it (through my university) and I am logged into my account. I have checked this by looking at the toolboxes included as part of my university licence as well as checking from the command window using --- license checkout Image_Toolbox --- and received ans = 1
3) The addon is enabled.
I have also checked for and run updates.


That function was introduced in R2018b, but for some reason, when you made up your post, you chose not to tell us what release you're using. If it's not a secret, could you do this and tell us what it says?
>> ver
You can remove your license number before you post what it says though.
Ah right. I didn't include the MATLAB version as I presumed it would be to do with the toolbox, rather than the MATLAB version and that running the update would deal with it. In all honesty, I have little experience with toolboxes, so apologies if this is all trivial. Anyway:
MATLAB Version: (R2018a) Update 6
Operating System: Microsoft Windows 10 Home 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
MATLAB Version 9.4 (R2018a)
Simulink Version 9.1 (R2018a)
Bioinformatics Toolbox Version 4.10 (R2018a)
Control System Toolbox Version 10.4 (R2018a)
Curve Fitting Toolbox Version 3.5.7 (R2018a)
DSP System Toolbox Version 9.6 (R2018a)
Data Acquisition Toolbox Version 3.13 (R2018a)
Database Toolbox Version 8.1 (R2018a)
Image Acquisition Toolbox Version 5.4 (R2018a)
Image Processing Toolbox Version 10.2 (R2018a)
Instrument Control Toolbox Version 3.13 (R2018a)
MATLAB Compiler Version 6.6 (R2018a)
MATLAB Compiler SDK Version 6.5 (R2018a)
MATLAB Report Generator Version 5.4 (R2018a)
Optimization Toolbox Version 8.1 (R2018a)
Signal Processing Toolbox Version 8.0 (R2018a)
SimBiology Version 5.8 (R2018a)
Simulink Control Design Version 5.1 (R2018a)
Spreadsheet Link Version 3.3.3 (R2018a)
Statistics and Machine Learning Toolbox Version 11.3 (R2018a)
Symbolic Math Toolbox Version 8.1 (R2018a)
My aim is:
1) Have an image pop up
2) Allow user to draw a shape (rectangle/circle/freehand) - how I found drawrectangle
3) Save the coordinates of the shape for future use
The information you found about drawrectangle() is for R2018b; in R2018a you would still use the other function.

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1 Answer

Answer by Akshay Khadse on 20 Nov 2018
Edited by Akshay Khadse on 20 Nov 2018
 Accepted Answer

The drawcircle and drawrectangle were introduced in MATLAB R2018b. Usually, this information can be found at the bottom most part of the documentation page. You can confirm this from the following documentation links:
For MATLAB R2018a, you could use the imellipse and imrect. Please refer to the following documentation pages for more information:
Please take into account the following:
  1. It might be best to upgrade to MATLAB R2018b and use drawcirclre and drawrectangle as it is recommended to use these commands over imellipse and imrect in the above documentation.
  2. There are some differences in the working and application of the commands like the drawrectangle vs imrect and drawcircle vs imellipse.


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