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Bitcoin Cryptocurrency Mastering Development

Can the forked be unforked? :)

So….BTC, BCH, BTG and BSV all trade at different prices/values. All have forked off from BTC and have different development teams, theories, practices, technology, etc. I noticed that when you look at the amount of coins mined on sites like coinmarketcap.com, it shows the following circulating supplies for each: BTC = 18,287,125 BCH = 18,351,063 […]

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Development

SQL – Columns will not sum

New to coding SQL and have just been Googling my way to write Queries that work for me but I am having a hard time with the one I am currently working on. The goal of the query is to sum the AHT and ACW columns based on the week number. I got it to […]

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Development

Two-Way Repeated Measures ANOVA: Error in lm.fit()… 0 non-na cases (rstatix)

I am trying to run a Two-Way Repeated Measures ANOVA using the R Statix package based on the description from here however I am running into the subject error with my dataset. The data consist of 10 replicate biomass measurements recorded at each of 8 Locations across 5 months (10 reps x 8 locations x […]

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CMS Development Magento

Magento 1.9 – After Export Products, Category few columns values like 000,000,000

After export products, category few columns like 12,223,234,544,348,000,000,000 what is mean 000. How to view what category it is? FYI – few products assigned to more than one category like 6 or 7 categories. Screenshot : https://imgur.com/xKK9Tzi File : https://we.tl/t-F2HsGD2bma

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Development

How to cycle through permutations of a list of 88 elements?

I’m trying to assign a single variable each permutation of a list of 88 elements one after another. This means the variable would be re-assigned a new permutation 88! times. I have tried making 88 nested for-loops but apparently there is a limit to how many for-loops you can nest. I am using Python. elements […]

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Development

UBER CRM case study Customer retention metrics in SQL

Background: I want to find the retention of a customer cohort on a weekly-rolling basis, so that they can take necessary intervention if a rider has not taken a ride for 28 days. Link : Problem in detail Below are list of metrics I’m trying to achieve in a single query Definitions of Columns in […]

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Development Python

Parsing a .pdb file in Python and creating a dictionary for specific record types

First, let me start by saying that I’m doing this as a Python exercise and I’m not allowed to use Biopython. I am writing a script that will help me parse any .pdb file generated from a trajectory. I am trying to create a dictionary that would link the chain variable with the resNumber variable. […]

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Development

How to get extremes from already determined groups of peak/valley indexes? [python]

I’m sorry if i’m butchering the question but essentially i have 3 arrays. One array which is the signal data, and an array of peak indexes and an array of valley indexes. The problem however is that sometimes there will be multiple indexes for a peak in a row before there is a valley index. […]

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Development

Combine blocks of different images and produce a new image

I have six photographs. I changed them into block structure. Consider an image of size 200×200. 1. I converted into blocks of 10×10 so now I have 400 blocks in total each of size 10×10. I did this for each image. 2. Then I found the mean value for each block. Again for all images. […]

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Development MySQL

How to improve MySQL stored procedure run for 20 seconds

I have a stored procedure which will run for 20 seconds and make high cpu usage, I found it in the slow query log, this stored procedure always exist and will run for 15 to 30 seconds. I believe this stored procedure caused the high CPU usage. So I am trying to use explain to […]