MATLAB: Function_Handle error using fsolve

fsolvefunction handle

Hello, I am running R2016a (with Optimization Toolbox) and I encounter problems using 'fsolve' to solve a rather simple system. Here are two images that show the command and the prompted errors. Any idea what is wrong with my code?
Thank you in advance!
JB
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Best Answer

Are you sure that you have the Optimization toolbox installed and licensed?
Please search:
which fsolve -all
and post the result. Does the ver command confirm, that the Optimization toolbox is running?
[EDITED] Matlab's license mechanism reacts too sensitve to names of user-defined functions, when they equal the name of a toolbox function. Then Matlab decides (under not documented circumstances) to disable a license. I'm using http://www.mathworks.com/matlabcentral/fileexchange/27861-uniquefuncnames to avoid such collisions, but actually a set of all names of M-files in a full Matlab installation would be required.
To check this, 1. be sure not to write any files to Matlab's toolbox folders, 2. remove all user-defined folders from the path and then run fsolve again. 3. re-inster the user-folders until the error occurs again. Now check the names of the M-files in the last added folder. Or perhaps the posted tool helps already.
I don't think, that this matchs your problem: https://www.mathworks.com/matlabcentral/answers/284141-why-do-i-get-the-message-has-no-license-available-when-i-run-which-all-function
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