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how to test if toolbox exists?

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C Lira
C Lira on 3 May 2012
Commented: Farid on 16 Aug 2022
I am writings some code that I wish to distribute open source. Within my code, I'd like to check if the end-users have fsolve in their installation and if not, use fzero. I'd rather the end-user not get ugly messages about functions not existing, and beginners will be so confused about what to do to fix the error, or they will hate Matlab. Is there a way that this can be implemented easily?

Answers (4)

Walter Roberson
Walter Roberson on 3 May 2012
Walter Roberson
Walter Roberson on 15 Aug 2022
Note that 'Neural_Network_Toolbox' is the old name for Deep Learning Toolbox, and the old name is still used internally for license capabilities.
If you want to find out whether Deep Learning Toolbox is installed, then
----------------------------------------------------------------------------------------------------- MATLAB Version: (R2022a) Update 4 MATLAB License Number: Operating System: Linux 5.4.185-0504185-generic #202203160950 SMP Wed Mar 16 14:00:16 UTC 2022 x86_64 Java Version: Java 1.8.0_292-b10 with AdoptOpenJDK OpenJDK 64-Bit Server VM mixed mode ----------------------------------------------------------------------------------------------------- Deep Learning Toolbox Version 14.4 (R2022a)
Again, 'nnet' is an internal name for this purpose, derived from the old marketing name Neural Network Toolbox
If ver shows the toolbox but license test does not show it, then go to the command window and Help -> Licensing -> Update Current Licenses... to make sure the license is up to date (in case features got added to the license after the file was downloaded.)

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Image Analyst
Image Analyst on 3 May 2012
Here's the code I use:
% Check that user has the Image Processing Toolbox installed.
hasIPT = license('test', 'image_toolbox');
if ~hasIPT
% User does not have the toolbox installed.
message = sprintf('Sorry, but you do not seem to have the Image Processing Toolbox.\nDo you want to try to continue anyway?');
reply = questdlg(message, 'Toolbox missing', 'Yes', 'No', 'Yes');
if strcmpi(reply, 'No')
% User said No, so exit.
You'll need to adapt it for any toolboxes that you want to check.

Geoff on 3 May 2012
Try this:
v = ver;
has_fsolve = any(strcmp(cellstr(char(v.Name)), 'Optimization Toolbox'));
Or more specifically:
has_fsolve = ~isempty(which('fsolve'));
Jan on 3 May 2012
{v.Name} is nicer than "cellstr(char(v.Name))".
Geoff on 4 May 2012
Oh, thanks =) I get a bit baffled sometimes when things look like the right type but return multiple answers. That's a much nicer syntax.

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Reza Ahmadzadeh
Reza Ahmadzadeh on 29 Jun 2015
You can use the existing function in FileExchange called isToolboxAvailable . The usage is as follows:
result = isToolboxAvailable('image processing toolbox','error');
  1 Comment
Kjartan Andersen
Kjartan Andersen on 27 Feb 2016
Not a good idea to have an external functionality to check for dependencies. What if the user doesn't have this tool?

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