I just installed KDE Plasma on Manjaro. I set it up like I like it, I have one problem with it that I didn’t find a solution for. Most of the programs launch on “wrong” places on the desktop (not where I want them to). I used xfce until now and got used to it. […]

# Day: March 26, 2020

I’m trying to automatically pull out the mac address of a arduino device using a shell script, and need some help how to do this. This is the output returned by the command: Opening /dev/cu.SLAB_USBtoUART @ 115200… Connecting to ESP32 ROM, attempt 1 of 10… Connecting to ESP32 ROM, attempt 2 of 10… Connected, chip: […]

I’m using the following command to compare directories on my local and remote machines rsync -K –delete -n -avrc $cwd/* simon@${othIP}:$cwd > /tmp/output where the macros have the obvious values. I can then parse /tmp/output to find which files would be deleted from the remote if I synced. But I need to distinguish between files […]

I’ve got an assignment to solve this problem: Calculate the change in Enthalpy when 50cm3 if 0.2moldm-3 NaOH is added to 250cm3 of HCl. The initial temperature is 21.6C and it rose to 32.8C. I tried solving it by doing: ((250*4.18*11.2)/1000)/0.01 But it results in the change in enthalpy being -1170.4kJmol-1 which seems quite high. […]

I have a similar request as per question but I am totally not into php and would not know where to start to make such edits based on the answer provided. Would be great if anyone could help here. This is for a simple school project where teachers can share assignments with thier students. Students […]

I’m working on Magento 2 website that somebody developed before me. The website has Ultimo Theme. I’m trying to remove a block with a slider on the top of the home page. In the Ultime guide that block is referenced as “preface” static block (it’s located below the navbar and right above the page content). […]

I’m a student and I need to set up a WPA2 EAP-TLS based architecture. But I’m unable to log in to my access point using my generated certificates. I followed this tutorial to set up my Freeradius server. I generated my certificates from the /etc/freeradius/3.0/certs with make. I have an access point using hostapd configured […]

Unfortunately, my server is unable to send email. I found the following tutorial by searching the web: https://pepipost.com/tutorials/install-sendmail-server-centos-7/ But when I enter the sudo yum install sendmail sendmail-cf m4 command, I get the following output [root@server ~]# sudo yum install sendmail sendmail-cf m4 Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirror.checkdomain.de […]

Let $F : [0, 2\pi] \to \mathbf{R}$ be a periodic function, with Fourier expansion $$F ( x ) = \sum_{k \in \mathbf{Z}} f_k e^{ikx}.$$ Fix $N = 2M + 1$ for $M \in \mathbf{N}$, and suppose I perform the following procedure: Sample $x^1, \ldots, x^N \sim^\text{iid} \text{Unif}(0, 2\pi)$. Form the interpolant $\hat{F}$ of $F$ through […]

## Maximizing quadratic forms

Consider the maximization problem $$\text{maximize} \quad Q(x)= \sum_{i<j} \Big(\sum_{k} a_{ik}a_{jk}\Big) x_i x_j \quad \text{subject to} \quad \sum_{i}x_i^2=1,$$ and let $M$ be maximum value obtained by $Q$ under such constraint. Suppose that $a_{ij}=a_{ji}$ for all $i,j$ and that $$ \begin{cases} a_{ij}=0 &\text{if $i+j\equiv 0\mod 2$,} \\ a_{ij}>0 & \text{if $i+j\equiv 1\mod 4$,} \\ a_{ij}<0 & \text{if […]