How to plot the convergence figure of the trustregions solver ?

[Prokins Wang]

Hi,

    I'm trying to show the great convergence of the objective value versus the iteration number, but I only find these code 

semilogy([info.iter], [info.gradnorm], '.-');
xlabel('Iteration number');
ylabel('Norm of the gradient of f');

which can only plot the figure of norm of the gradient versus the iteration number. Is there a way to plot the objective value against the iteration number ? Any comments would be appreciated!

Best

Prokins

[Nicolas Boumal]

Hello Prokins,
Yes: use info.cost instead of info.gradnorm, if I remember correctly. On the manopt website, in the tutorial, do a text search for the word "gradnorm" and you will find a list of statistics available in info. You can also see this if you type "help trustregions" at the Matlab prompt.
Best,
Nicolas

[Muntadher Q Alsabah]

Dear Prokins,

Convergence speed should be examined - if not analytically, at least it should be plotted in figures.  

So I am also interested to present the convergence behaviour in figures.

I hope that Nicolas Broumal has an idea to help us to do so. 

Best wishes

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