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I'm currently learning C and also some datastructures such as binary search trees etc. I have trouble understanding HOW exactly changing pointer values within a function works in some cases and in others doesn't... I'll attach some of my code I wrote. It's an insert function which inserts values in the correct places in the BST (it works as it should). I tried working with pointers to pointers to be able to change values withing a function. Even though it works, im still really confused why it actually does. I don't quite understand why my insert function actually changes the BST even though I only work with local variables (tmp, parent_ptr) in my insert function and I don't really dereference any pointers apart from " tmp = *p2r " in the insert function.

Thanks for helping out.

I have a multi-step form using kendo and basically what i want to do is to pass the values from the function Charging to one of the steps so i can use the user inputs in a fetch API GET request. Normally i would have done it with props, but the thing here is that i am passing data from a function. I tried useContext but i can't make it work and i went through the kendo form code many times in order to grasp its methodology but i still can't pass the values. I am getting the values from onStepSubmit() handler and i can get them outside this callback with useState, but even then i can't pass them.

Here is the code for the main function where i get the values

I've been trying to implement an NFA, and the code at the bottom is to derive the epsilon closure of all the current states. I'd like to implement it using in recursive style, because the epsilon closure is by definition recursive. In the current implementation, a helper function is defined inside the main function using flet, and it seems that every time of the recursion a helper function is independently defined. Is my understanding correct? If so, what is the tidiest way to implement this code without defining the same thing many times?

As far as I can tell, the two programs in the code below are identical. In the first program, I just assign the parameter to a scalar. In the second program, I store this scalar for each observation in a temporary variable.

Mathematically, that should be the same, yet the second program produces "numerical derivatives are approximate" and "flat or discontinuous region encountered".

Why cannot the derivatives be computed properly in the second approach?

Description

My ultimate goal with this program is to have a Flask web app be projected, someone connects to it, and they can control stepper motors with it using the Adafruit Stepper Motor HAT. At the moment, the visual code is a bit of a mess due to me wanting to have a login system, and realizing that with my limited time to get this done, I need to focus on making it work...

What's Wrong?

At the moment, the stepper motors work fine. The user pushes the (what's called for now) login button, and the motors spin, and pushes the stop motors button to stop. That's where the problem comes in... The motors don't stop, they just slow down to a painful pace, and the web page gets stuck trying to load an infinite loop. How do I stop this?

Try to understand that I have been at this for a week, and have pulled every trick I know. The code is a bit messy with the global variables and all now due to my desperation to just make it work.

Code is included here:

Python

I'm trying to operate a stepper motor using a Raspberry Pi and adafruit Motor HAT, in order to turn a rod which lifts small water-filled pots. However I need to do this in slow stages, to allow water to drain out and prevent the system being too heavy for the motor.

I am trying to create a nested loop which performs a discrete number of steps, pauses for a period, then performs the loop again. I am having difficulty with pause element, as my attempts at nesting end up turning the motor off after the first rotation.

I can simulate the effect I want to achieve using the code below, but it is obviously bulky, inefficient and difficult to precisely fix the number of loops.

I'm currently working on module witch have to write custom data to order and quote. This data are passed from onestep/checkout. I have added checkbox in shipping method section by editing template.

So far I have created attribute for order and quote with install script witch is displayed in tables:

I'm just learning how to use Payola to create Subscriptions for my RoR 5.1.5 test app. I'm following along with the instructions on the wiki.

I've set up the sample form taken from the example on the Wiki and dropped it right into app/views/subscriptions/new.html.erb. When I enter the credit card, email, expiration date and click Submit, I get this Rails error: undefined method `amount' for nil:NilClass

I've created the SubscriptionPlan in the rails console and confirmed it exists. I've confirmed that the new Plan shows up in my Stripe dashboard after creating it in the console.

I'm sure I've overlooked something, and hoping someone has experienced this same issue and can point me in the right direction. It feels like I am not specifying the plan anywhere. I'm not sure how I should do that.

Thanks for your help.

Code is here. app/models/subscription_plan.rb

First some important info. I can't change anything in the calls, code, functions etc that are used. So bottomline is that I have to use a workaround.

Ok I have a form with some fields and a dropdown. When loading that form I hide a specific field with some jquery. That field isw hidden when the value matches some value in an array. The problem i'm facing is that when we use the dropdown there's an json call being made to an external service (for countries) and then the form is being updated.

Since I can't get to the code that updates the form after a succesfull json call I need to find something to check if everything is done loading and if so hide my specific field again.

To make things clear: