Problem with Minimize

You haven’t defined U0, n, or b.

Look carefully at your definition of Av-target.

There are other problems, but fix those first.

Your function P.diss is a simple linear function which depends on I.tot only.

The arguments G.1m G.2, G.C and G.E you used when you defined the function are obsolete as they are not used in any way in the definition. So you also can’t minimize that function with respect to these variables.

P.S.: I don't visit this forum as often anymore, and I just noticed that you can't even paste images directly anymore. I get an error message saying something went wrong and that I should check my link(???) and try again.
Is this a known issue? Has the situation here on the forum actually gotten even worse, or is this just a temporary glitch?

Hi Werner,

You are not the only one who cannot paste an image.  You used to be able to so it must just be a glitch.

Thanks for trying. I just tried and it still does not work.

Hope the admins are aware of the problem.
Is there a generic username for admins like @admin?
Of course, we can try to get the attention of ​@Jaime_Lee , ​@olivierlp  or ​@AndrewK  but a generic name would definitely make sense IMHO (the same goes for the mods).