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Bitcoin Cryptocurrency Mastering Development

how and when does block and transaction validations take place?

I have a couple of questions and will try to explain them here. So, let’s say we have 4 nodes in the whole network. one of the nodes (node A) took transactions from pool. before they put it into a candidate block, they first validate each transaction, right ? if so, i guess they check […]

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Artificial Intelligence (AI) Mastering Development

What are the rules behind vector product in gradient?

Let’s suppose we have calculated the gradient and it came out to be $f(WX)(1-f(W X))X$, where $f()$ is the sigmoid function, $W$ of order $2\times2$ is the weight matrix, and $X$ is an input vector of order $2\times 1$. For ease let $f(WX)(1-f(W X))=\Bigg[ \begin{array}{c} 0.3 \\ 0.8 \\ \end{array}\Bigg]$ and $X=\Bigg[ \begin{array}{c} 1 \\ […]

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Ask Engineering

How do analyze input impedance of Class AB amplifier biased with resistors?

EDIT: I realize that the original circuit is deeply flawed and will burn up upon re-entry. Thanks to anyone who can help me understand why! I’m learning to analyze Class AB amplifiers, but haven’t found a good source with information on how to determine their input impedance. I built this circuit as an example. It’s […]

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Ask Cooking & Recipes

Rhubarb & Custard Swiss Roll: Rachel Allen

By Rachel Allen Celebrity Chef More from Rachel Allen’s Cake Diaries A delicious classic recipe for a very classy cake. Ingredients butter (melted, for greasing) 4 eggs 125 g (41/2 oz) caster sugar (plus 3 tbsp for sprinkling) 2 tblsp warm water 1 tsp vanilla extract 125 g (41/2 oz) plain flour (plus extra for […]

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Mastering Development

Google Script Copy/Paste/Clear Removing Pasted Cell

I am writing an action script in Google Sheets to copy a cell, paste it in another, then, ideally, clear the first cell. I have the copy and paste function working, but when it runs the clear on the copied field, it’s also clearing the cell that it was pasted in. Here is my code: […]

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Linux Mastering Development

What is the difference between sending carbon copies of mail message to other users and sending mail to multiple users at the same time

In Unix, the -c option in mailx command sends copy of message to other people and has the following syntax: mailx -s "Subject" -c "jpm,sumit" charlie < message.txt where jpm and sumit are people to whom the copies of the mail sent to charlie, are to be sent. Here the other users’ name are enclosed […]

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Apple User Help

iPhone and iPad says IMAP server is not responding after password change, but works on other devices

I’m having a bit of a brain-scratcher with my parents’ phones and iPads. My stepmum received a notification that a attempt by someone to log in to her Google account (with the right password) had been blocked, so I started changing passwords for the accounts variations of that password were used. One of those accounts […]

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User Help

Disk goes to sleep a lot

Running PopOS-20 /ubuntu based. This is a secondary box I use for backups etc. I have a 750GB HD. What’s weird with that one, and something I have never had with any disk before, is that it goes to some sleep state very often and very soon. I usually log in via sshd, then, after […]

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User Help

Disk goes to sleep a lot

Running PopOS-20 /ubuntu based. This is a secondary box I use for backups etc. I have a 750GB HD. What’s weird with that one, and something I have never had with any disk before, is that it goes to some sleep state very often and very soon. I usually log in via sshd, then, after […]

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Mastering Development

Using one button to display different images on an oled display

I am using an oled display with the Adafruit_GFX and Adafruit_SSD1306 libraries. I am trying to create a menu on my oled display (a series of different images). I have created code that, when one button is pressed, the screen changes to one image, and when pressed again, the screen changes to the second image. […]