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kandi X-RAY | textbooks Summary
kandi X-RAY | textbooks Summary
Welcome to Mathigon, an award-winning mathematics education platform for students aged 12 to 18. Part textbook and part virtual personal tutor, it uses cutting-edge technology and an innovative new curriculum to make learning mathematics more fun and more interactive and engaging than ever before. Learn more…. This repository contains the source code and assets for all our courses.
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QUESTION
I was wondering if someone here could help better explain For loops than my textbooks.
I'm writing a program in Python where the program askes a user if they're already an existing user. If they are an existing user, the program starts. If they're not an existing user, they're prompted to create a username and password.
I was wondering if someone could help explain how I could use a For Loop to loop the if statement incase a user enters some unexpected input like A or a number.
Thanks
Here's a code snippet of an if statement I have where it goes:
...ANSWER
Answered 2021-Jun-13 at 20:26Try creating a while loop, and only break out of this if a condition is met.
QUESTION
I was looking at several textbooks, including Numerical Linear Algebra by Trefethen and Bau, and in the section on floating point arithmetic, they seem to say that in IEEE-754, normalized floating point numbers take the form .1.... X 2^e
. That is, the mantissa is assumed to be between 0.5 and 1.
However, in this popular online floating point calculator, it is explained that normalized floating point numbers have a mantissa between 1 and 2.
Could someone please tell me which is the correct way?
...ANSWER
Answered 2021-Jun-02 at 10:47The following sets are identical:
- { (−1)s•f•2e | s ∈ {0, 1}, f is the value of a 24-bit binary numeral with a radix point after the first digit, and e is an integer such that −126 ≤ e ≤ 127 }.
- { (−1)s•f•2e | s ∈ {0, 1}, f is the value of a 24-bit binary numeral with a radix point before the first digit, and e is an integer such that −125 ≤ e ≤ 128 }.
- { (−1)s•f•2e | s ∈ {0, 1}, f is the value of a 24-bit binary numeral with a radix point after the last digit, and e is an integer such that −149 ≤ e ≤ 104 }.
- { f•2e | f is an integer such that |f| < 224, and e is an integer such that −149 ≤ e ≤ 104 }.
In other words, we may put the radix point anywhere in the significand we want, simply by adjusting the range of the exponent to compensate. Which form to use may be chosen for convenience or preference.
The third form scales the significand so it is an integer, and the fourth form incorporates the sign into the significand. This form is convenient for using number theory to analyze floating-point behavior.
IEEE 754 generally uses the first form. It refers to this as “a scientific form,” reflecting the fact that, in scientific notation, we commonly write numbers with a radix point just after the first digit, as in the mass of the Earth is about 5.9722•1024 kg. In clause 3.3, IEEE 754-2008 mentions “It is also convenient for some purposes to view the significand as an integer; in which case the finite floating-point numbers are described thus:”, followed by text equivalent to the third form above except that it is generalized (the base and other parameters are arbitrary values for any floating-point format rather than the constants I used above specifically for the binary32 format).
QUESTION
I have built several generalised nonlinear least squares models (exponential decay) with the R
package nlme and the contained gnls()
function. The reason I do not simply build nonlinear least squares models with the base nls()
function is because I want to be able to model heteroskedasticity to avoid transformation. My models looks something like this:
ANSWER
Answered 2021-Apr-13 at 00:54I implemented a bootstrapping solution. I initially did standard nonparametric bootstrapping, which resamples observations, but this produces 95% CIs that look suspiciously wide — I think that this is because that form of bootstrapping fails to maintain the balance in the x-distribution (e.g. by resampling you could end up with no observations for small values of x). (It's also possible that there's just a bug in my code.)
As a second shot I switched to resampling the residuals from the initial fit and adding them to the predicted values; this is a fairly standard approach e.g. in bootstrapping time series (although I'm ignoring the possibility of autocorrelation in the residuals, which would require block bootstrapping).
Here's the basic bootstrap resampler.
QUESTION
In a table I want to display the following items in a single Row. Can someone help me out loop the JSON so I can rearrange the items as shown below.
StudentId | CourseTitle | TextbookName
23 | Biology | Biology Today
JSON
...ANSWER
Answered 2021-Mar-14 at 19:30If I got it right, try following:
QUESTION
Good time everyone I stucked with the problem with Google Classroom API and C#. I want to be able to create course from discord bot but since I had problems I decided to try with a simple example from the source
There are some additional libraries connected but this is just a scratch. The problem is that this code that I pasted from the official google api website is returning error. I've searched the net searching the solution and found some cases. Someone asked to turn on API in Google Cloud Console and I turned on Google Classroom API on my project. But it didn't help. But I can read information from the google account's classrooms, like courses' names and etc.
This is a new (and first) experience with Google API and I can don't know some basic things for example? What should I do?
...ANSWER
Answered 2021-Mar-01 at 13:45ClassroomCoursesReadonly
cannot be used to create courses, just to retrieve them.
So I found the solution:
- Change the Scopes from Readonly to just ClassroomCourses
- Recreate credentials
- Upload the new file in project folder
QUESTION
Recently I started learning Web scarping. For this purpose I need to focus on URLs and there basic structures. I considered two URLs from Amazon and Priceline for home work purpose.
The some basic concepts of URL
- A query string comes at the end of a URL, starting with a single question mark, “?”.
- Parameters are provided as key-value pairs and separated by an ampersand, “&”.
- The key and value are separated using an equals sign, “=”
- most web frameworks will allow us to define “nice looking” URLs that just include the parameters in the path of a URL
Amazon URL
https://www.amazon.com/books-used-books-textbooks/b/?ie=UTF8&node=283155&ref_=nav_cs_books_788dc1d04dfe44a2b3249e7a7c245230
As per my understanding:
...ANSWER
Answered 2021-Feb-25 at 18:05Tips that may help are:
Data can be posted via GET or POST. What you are describing with URLs is GET. POST is when you don't see anything in the url.
In both cases getting familiar with using your browser's developer console will help you explore how websites work. In Chrome, you can hit F12 or right click any element and select "inspect element." This is especially helpful when trying to inspect data that is passed using POST, since you can't see them in the url. Use the "network" tab while clicking around to see what the website is doing in the background.
Lastly, just play around with websites. For example, when you browse Amazon you might notice the urls look like https://www.amazon.com/Avalon-Organics-Creme-Radiant-Renewal/dp/B082G172GL/?_encoding=UTF8 but if you play around with it you notice you can delete out the title and the url still works like this: https://www.amazon.com/dp/B082G172GL
QUESTION
I am writing an application backed by Postgres DB. The application is like a logging system, the main table is like this
...ANSWER
Answered 2021-Feb-25 at 02:40The simple thing to do is to create a B-tree index to speed up the search:
QUESTION
I have an array of arrays, containing aggregated data on total number of clients, total number of orders, total value of orders and location.
...ANSWER
Answered 2021-Feb-04 at 04:29You can generate a hash to easily look up the client count using each_with_object
. You can then map over the current_clients
array and add the client count.
QUESTION
I'm currently learning beginner level Java and have a problem with an ArrayList
when used in a constructor as a parameter.
When I have to initialize an ArrayList
in the class constructor, I usually write something like this (for the sake of this example, let's assume that I want to create an ArrayList
of integers as the class field).
ANSWER
Answered 2020-Dec-26 at 09:47There is a difference, yes. In the code presented, one would call the constructor like so:
QUESTION
Right now I'm learning about accountant amortization. There is an example that is in many textbooks and websites where they teach accountant amortization with the multi pop method of a stack. The literal cost of the stacks operations where ''' Push: 1 Pop: 1 Multipop: min(stack.size, k) ''' I understand these operations costs, but then the example always shifts to assigning amortized costs to those functions which are always ''' Push: 2 Pop: 0 Multipop: 0 ''' Why when assigning costs is push 2? Why is pop and multi pop 0? Wouldn't multi pop have a greater value than push?
Thanks for the help.
...ANSWER
Answered 2020-Jun-30 at 03:11The sneaky thing about amortization is that real costs no longer exactly correspond to amortized costs. There's no general method for determining how operations are amortized other than you can't go bankrupt, so you could make the amortized cost of multi-pop be 5 if you wanted.
In this example, you can imagine that whenever we push an element (cost 1), we also purchase a voucher good for popping that element (cost 1, so 1 + 1 = amortized cost 2 since we did a unit of work and prepaid for another). Then we pay for the pops using vouchers only, so both pop and multi-pop are free.
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