Categories

## Why some LPeg substitutions don’t show up when there are many levels of captures in an LPeg script?

I am new to StackOverflow and I ended up asking this question after reading everything I could find on the Internet about captures in LPeg. I am learning LPeg and I have successfully built a few programs using captures and text substitutions using C and Cs. However I realize that there is still something escaping […]

Categories

## dividing the values of data.table1 by data.table2 in R

I have created two fictional data.tables which summarise the cost and count of the items that contributed to the cost. I would like to calculate the average item cost = cost/count. How can i divide the values of the two data.tables ? combi_sum <- dcast(merge(mtcarsTOTAL[,.(cost, gear)], iris[, .N, .(carb, gear, gender, age)], by = “gear”), […]

Categories

## I’m trying to send data to a parent table and also one of its three child tables. Only one of the child tables work and i cant figure out why

I’m using MySQL and PHP with XAMPP. I can not figure out if this is a problem with my database or with my PHP. In lines 28-96 (i made a comment in the code so you can see which ones I’m referring to) The capstone child table works. If I select capstone as the project […]

Categories

## Bounding a solution set IVP

My general solution set turns out to be $$c_1e^t(0,1,1)+c_2(\cos(t)-\sin(t), \cos(t), 0)+c_3(\sin(t)+\cos(t),\sin(t),0)$$ My question is what initial conditions are necessary for the solution set of the IVP $x(0)=x_{0}$ to be bounded for every $t \geq 0$? How do I go about tackling this

Categories

## Sort Nested Json Object based on value in for loop?

Hoping someone can help me out here or at least point me in the right direction. I have spent hours trying to get this sorted and I am lost. The code below is just mock, my actual json is returned via AJAX using jquery. My problem is not sorting, but sorting on a nested json […]

Categories

## Annotation with symbols inside stacked bar charts using Google Chart API

I have a stacked bar chart where I need to annotate the bars with $symbol as the profit and costs are currency. I am successful in annotating of the bars without currency symbol but I am unable to display with the$ prefixed. Could anyone throw light on this <html> <head> <script type=”text/javascript” src=”https://www.gstatic.com/charts/loader.js”></script> […]

Categories

## password_hash() expects parameter 2 to be long, string given [duplicate]

Since updating to php 7.4.1 I now have 2 errors appearing when people try to register. the errors are below: error 1: Warning: password_hash() expects parameter 2 to be long, string given in C:…\classes\password.php on line 31 error 2: SQLSTATE[23000]: Integrity constraint violation: 1048 Column ‘password’ cannot be null This is the code causing the […]

Categories

## How to change the Hover background color in ggplotly for bar chart

I using ggplotly to plot a graph. I am using the tooltip function to represent the values in the barchart when the cursor is moved on the top of the graphs. Source_Data <- data.frame( key = c(1, 1, 1, 2, 2, 2, 3, 3, 3), Product_Name = c( “Table”, “Table”, “Chair”, “Table”, “Bed”, “Bed”, “Sofa”, […]