problem 10.7 of Betts' book

[Peter230655]

In this example I added one differential equation to the eoms, as opty currently requires at least two scalar DE in the eoms.

[moorepants]

The file names have to start with plot_ otherwise they will not run. Sphinx gallery uses file name patterns to detect what files are examples in the gallery.

[moorepants]

This seems to run as a script but I am not seeing any output in the rendered html version.

[moorepants]

I think the plots will not show unless you return the axes from this function.

[moorepants]

When you rename a file you need to use git mv old_filename.py new_filename.py, that way the old file doesn't remain.

[Peter230655]

The old filename does not show when I do "ls" in git. How can I remove it?
Thanks!

[Peter230655]

I somehow seem to have managed to remove the old file...

[Peter230655]

Does this show the plots?

[moorepants]

Yes, it runs and shows the plots. I don't see any errors, as you mentioned in the other issue.

[Peter230655]

Yes, it runs and shows the plots. I don't see any errors, as you mentioned in the other issue.

You mean the error when I only have one scalar DE?
In the simulation I added a (mathematically not needed) second DE.
The DE in 10.7 is
$\dot y = -y^3 + u$
I changed this to
$uy = \dot y$
$uy = -y^3 + u$
like this it works fine, no error messages.

NB:
I run the problem twice:

• first with $t_f = 10000$ as given in the example. opty finds a locally optimum solution, but the value of the objective function is far away from the minimum given in the book.
• then I set $t_F = 8.0$ as I notived that y(t) $\approx 0$ except at the very beginning and close to the end. This way opty found a value for the objective function much closer to the one given in the book.

[moorepants]

You wrote "This program runs fine im VSC, but in examples-gallery it looks like it never evewn starts to be exceuted.
Did anything change in examples-gallery lately, or is something wrong with my program below for examples-gallery?"

here: #255 (comment)

[Peter230655]

You wrote "This program runs fine im VSC, but in examples-gallery it looks like it never evewn starts to be exceuted. Did anything change in examples-gallery lately, or is something wrong with my program below for examples-gallery?"

here: #255 (comment)

Sorry! This was fixed when I added the prefix "plot" to the name of the file, as you trold me,