## Box2d: High screen resolution / frequency causes high friction?

I’m using Cocos Creator with (built-in) box2d for physics.

Recently our game behaves weirdly on our new device Galaxy S20 Ultra 5G – which has screen size = 1440 x 3200 – frequency = 120Hz.

After stop pushing, all our physical bodies almost stop immediately like they has very high friction. No other device react that way.

Anyone experienced this issue can give me an advice?

## Character frequency graph for cipher text

I have studied about the mono-alphabetic substitution cipher. With Character frequency graph, the encrypted text can be decoded. I am wondering how can be happen?

## How does each element in the output array of a DFT correspond to a specific frequency?

I have a basic understanding of the Fourier Transform, though I’m trying to use it in a program and I’m confused on the specifics. Based on source code I can find online, the DFT takes a set of samples/numbers, performs a summation for each term, and returns a set of these summations which is the same size as the input set. Suppose I have a periodic function. As I understand it, the output array should contain the amplitudes/weights of each frequency which sum to that function. What I can’t figure out is how each frequency is encoded in the array as just an index. In each example I read, we just assign a summation at each iteration of the inner loop to the next consecutive index in the output array. How are these indices indicative of which frequency they correspond to?

I’m attaching the source code I’m referencing to the bottom of this in case the website I linked to ever goes down.

import cmath def compute_dft_complex(input):     n = len(input)     output = []     for k in range(n):  # For each output element         s = complex(0)         for t in range(n):  # For each input element             angle = 2j * cmath.pi * t * k / n             s += input[t] * cmath.exp(-angle)         output.append(s)     return output 

## Frequency of cantrips outside of battle

Despite being “at will”, how often can a cantrip be cast outside of battle? For example, how long must a player wait before shooting 2 fire bolts, and is there a limit to how many could be cast or can they just go at it continuously for a day without incurring penalties?

## Some Background

I have recently started DM’ing and there’s a few concepts that still elude me, or at least I am finding some trouble reconciling my interpretation of the rules and practical balance.

As I understand it, cantrips can be cast “at-will”. That’s fine inside of battle, but outside of it, things begin to get extremely broken. I have a player whose solution to most challenges is to “fire bolt it”. Is there a reinforced door? A stone wall? A shielded altar? He will just fire bolt it for 8 consecutive hours… Now, on most occasions I have been able to come up with counter-measures, like, bouncing the fire bolts back at him when they hit the altar’s shield, but still, it sounds ridiculous to me that you could just cast continuously for 2/3 of a day if you wished it so, without incurring any penalties… it’s simply absurd on so many levels! And yes, I know you technically could say “I hit it with my club for 8 hours”, and it would be just as ridiculous in my mind that there would be no fatigue, no weapon deterioration, etc…

I have told my player he can cast once every 6 seconds (since that’s the duration of a turn in battle), but I have no idea if that is correct, and it still feels unbalanced.

## Given node and value find frequency of given value from node to root in a tree

A tree with N vertices and N-1 edges is present.

A value x can be inserted in any of the nodes.

A single node may contain multiple values.

How do I answer queries of the given type?

Given a node n and value v find frequency of v in the path from node n to the root of the tree.

I require an algorithm that answers such queries in log(N) time.

## wholesale Solid State High Frequency Welder

COMPANY INTRODUCTION
Our History：
ZSHC Mechanical & Electrical Equipment Co., Ltd. was established in 2009, covering 20,000 square meters, with more than 100 employees. It has developed into a comprehensive enterprise integrating R&D, production, sales and service.
Our Factory：
The company has offices, technology department, purchasing department, sales department, foreign trade department, after-sales service center, production workshop, assembly workshop, commissioning workshop, inspection workshop, finished product workshop, etc. The organization structure is complete and closely linked, which ensures the company’s sustainable and healthy development. The technical department specializes in the development of technology, provides technical guidance for after-sales, provides a strong impetus for the company’s development in technology, ensures the maintenance of equipment and relieves customers’ worries. Debugging and inspection workshop, inspection refined to the surface treatment of each screw and casing.
Our Product：
The company mainly engaged in products: solid-state high-frequency welding machine, high-efficiency switch welding machine, high-frequency straight welded pipe mill line, intermediate-frequency annealing equipment, zinc spraying machine, shear butt welding, cooling equipment, palletizer, ultra-audio equipment and so on.
Product Application：
High Frequency Welding, Medium Frequency On-line Weld Annealing, Heat Treatment and other Induction Heating Equipment, and Industrial Automation Control Devices
Our Certificate：
Our company has obtained CE certification and ISO 9001 quality management system certification. Three new inventions and patents in high frequency welding
Production Equipment
Production Market：
Our products are exported to India, Thailand, Indonesia, Albania, Uzbekistan, Syria, Vietnam, Greece, Nepal and Many other countries and Areas.
Our service：
● Pre-sale Service:
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● Sale Service:
1. After the signing of the contract, the buyer’s technical specifications will be compiled, and the technical specifications will be perfected, supplemented and refined accordingly, so that the technical specifications will become the actual implementation technical documents, which will be executed after the buyer’s approval, and the technical agreement will be used as an annex to the equipment order contract.
2. Within the shortest time after the signing of the technical agreement, our company will submit to the buyer a list of standards for the design, manufacture, assembly, installation, commissioning, acceptance, testing, operation and maintenance of the contracted equipment for confirmation.
3. Provide the buyer with the drawings and information stipulated in the contract in time.
4. For the complete set of equipment purchased by the buyer in connection with the contract, our company takes the initiative to meet the technical conditions and information of the equipment interface requirements.
5. The quality problems arising in the process of equipment manufacturing shall be notified to the buyer without concealment.
6. Manufacturing of products, experimental testing of materials and products shall be carried out in accordance with relevant standards, and routine project inspection shall be carried out conscientiously.
7. factory acceptance. Debugging and testing the equipment before leaving the factory according to the contract and technical standards to ensure that the products are fully qualified.
8. After the equipment arrives at the site, our company will send experienced engineers to the site to guide installation, commissioning, operation and so on, and on-site technical guidance and training for the buyer’s operators to ensure the normal and safe use of equipment by the buyer.
● After Sale Service:
Our company has sufficient spare parts inventory and experienced technical after-sales personnel in China, able to respond quickly, and provide 7 x 24 hours full response service. Special commitment is made to provide free after-sales service within one-year warranty period and life-long paid service, and spare parts at the best price to ensure reliable and safe operation of the equipment during its service life.wholesale Solid State High Frequency Welder
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## Sitemap Change Frequency – Daily Vs Weekly

Hi All,

Recently I changed my sitemap change frequency to daily from weekly. Im not sure if this will affect my rankings at all. I know ill be spidered everyday but my content doesn't change every day. Could this have an adverse affect on my rankings and would a weekly frequency be more suitable?

Thanks

J

## Information Theory: Comparing surprisal of words with varying count frequency

This is a very broad question, I’m not sure if cstheory is the better place.

How can I compare the conditional surprisal of words that vary in frequency?

$$S(w|context)=−log(p(w|context))=−log(\frac{count(w,context)}{count(context)})$$

The $$count(w,context)$$ depends on the frequency of the word w because this can be further broken down to $$p(w|context)count(w)$$. This means a word that is more frequent will have a lower surprisal.

Is there a way to compare the surprisal of words with varying count/frequency, i.e control for frequency? Do I just divide $$count(w,context)$$ by $$count(w)$$ to normalize by count?

## Encounter frequency in the dungeon

Is there a standard or default frequency for wandering monster checks in the dungeon?

## Disable CPU frequency scaling?

I need to run ATLAS on my ubuntu laptop, but the software won’t run unless you dissable CPU frequency scaling. I’ve tried the instructions from here http://math-atlas.sourceforge.net/atlas_install/node5.html but they aren’t working on my Toshiba laptop. With freq-scaling on the software becomes useless.

Can anyone help?