how to test if toolbox exists?

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C Lira
C Lira on 3 May 2012
Commented: Image Analyst on 9 Aug 2022 at 19:05
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
For example,
license('test', 'image_toolbox')
Image Analyst
Image Analyst on 9 Aug 2022 at 19:05
When you asked "what should I type for deep learning toolbox, please?" I assumed you wanted a logical variable that gave true or false for whether or not you had the Deep Learning Toolbox. So that's why I gave you
hasLicenseForToolbox = license('test', 'Neural_Network_Toolbox'); % Check for Deep Learning Toolbox.
It does exactly that, which is what I thought you asked. Not sure why you said it didn't resolve your problem unless "what should I type for deep learning toolbox, please?" means something different than "what can I type to determine if I have a license for the Deep Learning Toolbox?"
@Reza Ahmadzadeh's code depends on a third party function, not a simple, built-in, one-line function call like I gave you. There is no need to use Reza's code (like the comment after it said).

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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'));
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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