How can I solve the error of {Undefined operator '.^' for input arguments of type 'optim.pro​blemdef.Op​timization​Expression​'}?

Hi,

I am running a Matlab Optimization Problem example as explained here, using MATLAB R2017b version :

https://www.mathworks.com/help/optim/ug/nonnegative-least-squares-problem-based.html

But I receive the folowing error:

Undefined operator '.^' for input arguments of type 'optim.problemdef.OptimizationExpression'.

Can anyone help with a hint about how to solve it?

Thank you!

Answer 1

[Walter Roberson]

You cannot fix that problem in that release. The first release or two of Problem Based Optimization supported only linear problems. Then support for quadratic programming was added if I recall correctly: until that was added, .^ would have produced systems that the solver could not deal with.

I have not checked recently to see if support for higher powers has been added.