[intro_supply_demand] Adding to supply and demand lecture

[jstac]

Adding introductory material to the start, for readers from computer science and other backgrounds.

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[jstac]

Hey @mmcky , is this failing due to broken links? That seems to be the message in the log file...

[mmcky]

Hey @mmcky , is this failing due to broken links? That seems to be the message in the log file...

That's right @jstac -- the linkchecker is failing with:

(        eigen_II: line  435) broken    https://math.stackexchange.com/questions/2433997/can-all-matrices-be-decomposed-as-product-of-right-and-left-eigenvector - 403 Client Error: Forbidden for url: https://math.stackexchange.com/questions/2433997/can-all-matrices-be-decomposed-as-product-of-right-and-left-eigenvector
(intro_supply_demand: line  332) broken    https://math.stackexchange.com/questions/275310/what-is-the-difference-between-linear-and-affine-function - 403 Client Error: Forbidden for url: https://math.stackexchange.com/questions/275310/what-is-the-difference-between-linear-and-affine-function
(markov_chains_II: line  619) broken    https://math.stackexchange.com/questions/3336616/how-to-prove-this-matrix-is-a-irreducible-matrix - 403 Client Error: Forbidden for url: https://math.stackexchange.com/questions/3336616/how-to-prove-this-matrix-is-a-irreducible-matrix
(         eigen_I: line 1274) broken    https://stackoverflow.com/questions/22867620/putting-arrowheads-on-vectors-in-a-3d-plot - 403 Client Error: Forbidden for url: https://stackoverflow.com/questions/22867620/putting-arrowheads-on-vectors-in-a-3d-plot

Looks like stackoverflow and stackexchange has blocked bot link requests with a 403 so I guess we need to add stackoverflow to the ignore pattern.

FYI - the linkchecker will only run once so if there are false positives any subsequent runs don't fail on any given PR.

[jstac]

Thanks @mmcky . I've pushed a trivial change to generate a build w/o the link checker.

[mmcky]

Thanks @mmcky . I've pushed a trivial change to generate a build w/o the link checker.

No worries @jstac -- also they are separate workflows so if you take a look at the box at the bottom of the PR

you will see the Build HTML and Netlify have green ticks. But you still get a nasty X and an email from the linkchecker saying it has failed unfortunately. Link checkers are both great and frustrating. I mainly setup the run just once (on opening a PR) to save our sanity :-)

[jstac]

To do:

• Get feedback from @thomassargent30
• Careful proofread, spell check
• Unify the colors across the whole lecture

[jstac]

@mmcky Tom has given the green light on these changes.

Would you mind to proofread and then change the colors below so they are unified with the colors above (same colors for supply curve throughout, demand curve throughout, etc.)?

[jstac]

This PR aims to close #358 and #355

Remaining tasks:

• Change the class to a NamedTuple and the methods to functions. Slightly change wording around the code to reflect this.
• In the integrals, change dx to \mathrm{d} x.
• Add a little explanation or some hints for scipy.optimize.minimize_scalar and scipy.optimize.newton --- perhaps just linking to our Python programming lecture on SciPy, which discusses both.
• proofread, spell check
• change the colors below https://intro.quantecon.org/intro_supply_demand.html#supply-and-demand so they are unified with the colors above (same colors for supply curve throughout, demand curve throughout)

@mmcky Would you mind to implement these changes?

[mmcky]

I have started the following discussion https://github.com/orgs/QuantEcon/discussions/128 to run some ideas around how to select colours for plots and figures in a more "style" friendly and consistent way across lectures.

[jstac]

Maybe add "The function below creates an instance of a Market namedtuple with default values."

[jstac]

I'm confused. Don't we already have the code in 670 above, in line 363?

Either way, I suggest dropping the back ticks, which should be reserved for code.

[mmcky]

sorry @jstac I prematurely pushed. Working on the final proof read now :-).

[mmcky]

this duplication is no resolved after 5e2d75b. I had implemented the namedtuple in the exercise first and was propagating it to the text.

[jstac]

Great work, thanks @mmcky.

• Would you mind to add some color to the integration plot?
• I guess the blue in https://65d2e116b996fdd433830db5--taupe-gaufre-c4e660.netlify.app/_images/588c1ba82d4c92f3f400cc7298cc50feb9a8c553f35be8cfa93ee948cc81b055.png should be made the same as the green in the inverse supply curve just below (since it's a discrete approximation).

Perhaps you could ask someone to embed the figures in numbered figure environments. It's not a big deal but it does make it easier to reference figures.

[mmcky]

thanks @jstac

Would you mind to add some color to the integration plot?

This is now back to blue for the area (default matplotlib style)

I guess the blue in https://65d2e116b996fdd433830db5--taupe-gaufre-c4e660.netlify.app/_images/588c1ba82d4c92f3f400cc7298cc50feb9a8c553f35be8cfa93ee948cc81b055.png should be made the same as the green in the inverse supply curve just below (since it's a discrete approximation).

Good catch. This is now green.

Perhaps you could ask someone to embed the figures in numbered figure environments. It's not a big deal but it does make it easier to reference figures.

All figures are now numbered with captions except those figures in the exercises. I didn't think they needed captions and/or references but let me know if you think they do.

👍

[jstac]

Perfect, thanks @mmcky !!

I'll leave you to merge when ready (and please make it live).