python 2.7 - How can you structure a script to identify like algebraic terms? -


i'm trying write script in way represents algebraic expressions, , i'm trying make general possible can accommodate, eventually, things multivariable expressions, e.g. xy^2 = z , other things trig functions. however, need script able simplify expressions, e.g. simplifying x^2 + 2x^2 = 3x^2 , in order need recognize terms. however, in order recognize terms need able tell me when 2 expressions identical, if don't same. instance need == defined in such way computer know (x^2)^2 x^4.

now far, way can see make computer know when 2 algebraic expressions identical this, try create kind of "normal form" expressions, , compare normal forms. instance, if distribute exponents on multiplication, multiply powers of sums, distribute multiplication on addition, , calculate simple expressions of numbers, might @ least close normal form. example normal form of (x^2)^2 x^4 , normal form of x^4 x^4. since have same normal form, computer can tell me they're equivalent expressions. normal form of (2x)^2+x^2 4x^2+x^2 , wouldn't recognize normal form same normal form of 5x^2, though.

i'm thinking, @ stage try define "weak" notion of equality, of equality of normal-form-components. use notion of equality, group terms in normal form, , me more universally correct normal form.

but of sounds absolute ton of work. far i've defined classes expressions, have subclasses of variables, sums, products, powers, , on, , right i'm 1/4 of way through defining function produce normal form of power object--i haven't begun on normal form sum or product class--and code many pages long, , i'm still not sure it'll work way want to.

so question is, how accomplish goal? current method work? know how software wolfram|alpha or sympy package accomplish functionality?


Comments

Post a Comment

Popular posts from this blog

resizing Telegram inline keyboard -

telegram's inline keyboard great feature lots of different use cases. inline buttons added list of items this: inline_keyboard = [[inlinekeyboardbutton(text="button", callback_data="button"), inlinekeyboardbutton(text="reset",callback_data="reset")]] inline_keyboard_markup = inlinekeyboardmarkup(inline_keyboard) update.message.reply_text("hi", reply_markup=inline_keyboard_markup) the above code adds 2 buttons each half width of chat screen. i know the normal keyboard button there resize_keyboard parameter somehow can used. my question is there way resize inline buttons ? example make full width or quarter width. unfortunately, can't now. :( you can suggest @botsupport , might add feature next version.
Read more

command line - How can a Python program background itself? -

consider following python command-line program. doesn't work because incomplete, think illustrates problem: #!/usr/bin/python3 import multiprocessing pool = multiprocessing.pool() task in expensive_iterator_with_user_interaction(): pool.call_async(expensive_computation, (task,)) pool.close() print("dear user, may press ctrl-z , bg script.") pool.join() thus, problem scripts needs user input while it's launching expensive parallel processes. there moment when user interaction not needed anymore. then, ask user background process shell actions. however, can achieved program itself? (side note: core of problem entanglement of user input firing “expensive computations”. therefore, cannot separate both in 2 scripts, , letting 1 spawning other daemon.) the command screen may you. use screen -l create new session , run application. after inputting data, can press " ctrl-a " , press " d " on keyboard detach session. now...
Read more

php - "cURL error 28: Resolving timed out" on Wordpress on Azure App Service on Linux -

Image
my wordpress installation on azure app service on linux using custom docker container has slow response times. pages take around 20-40 seconds load. i have troubleshooting plugin installed indicates problem "curl error 28: resolving timed out after n milliseconds" when making requests following urls https://api.wordpress.org/core/version-check/1.7/ http://api.wordpress.org/core/version-check/1.7/ https://api.wordpress.org/plugins/update-check/1.1/ http://api.wordpress.org/plugins/update-check/1.1/ https://api.wordpress.org/themes/update-check/1.1/ http://api.wordpress.org/themes/update-check/1.1/ curl works fine on scm-site command line. example works ok. curl -x post http://api.wordpress.org/core/version-check/1.7/ edit if ssh container , run php code, works fine. <?php $url = 'http://api.wordpress.org/core/version-check/1.7/'; $fields = array( 'version' => urlencode('4.8.1'), 'php' => urlencode(...
Read more