Matrices of Machine- or Arbitrary-Precision Real Numbers Error While Using Arnoldi for Large Sparse Matrix

I’m trying to use the built in Arnoldi method in Mathematica to compute the first 1440 eigenvalues of a large sparse matrix. After importing

Elements12 = NN /@ Uncompress[Import["Elements12.m"]] and applying the followings function

NN[{a_, b_} -> c_] := {a, b} -> N[c];

I define a sparse matrix

s = SparseArray[Elements12] 

which I’m able to nicely plot using MatrixPlot

MatrixPlot[s]. 

However when it comes to finding the first 1440 eigenvalues

Sort[Eigenvalues[s, -1000, Method -> "Arnoldi"]] 

I receive the error that “Method -> Arnoldi can only be used for matrices of machine- or \ arbitrary-precision real numbers” despite my matrix elements being machine presicion after applying NN. My matrix is 344640 by 344640 and has 5,300,000 non zero elements. Any help will be appreciated.

*Real* site crawling with Scrapebox?

So I see SB has the site crawler where you can crawl one domain at a time (a deathly slow process)….or you can use link extractor (over and over and over and over) in an inefficient way to grab most links at a time) or you can use the “search google” method to see what pops up….but

Isn’t there just like a regular ol’ webcrawler?  You give it a list of urls, it spidered through all the links, pulls out the links on a domain, and ding – turkey’s done.

Am I missing something obvious? It seems like such an obvious tool that should be included.  Instead, I find myself now poling aroudn the web to find some alternative.

Any ideas?
Thanks!!

Real cron killed my cron system. Only define( ‘ALTERNATE_WP_CRON’, true ); works

my host recommended me to disable wp cron for a real cron due to excessive executions.

the cron system broken immediately and scheduled tasks were not happening.

deleting real cron and turning on wp cron did not work.

through random luck, i tried define( ‘ALTERNATE_WP_CRON’, true ); and it worked.

having said so, i really want to revert back to the prior situation where normal wp cron works. it also messes up when all my links start to have &doing_wp_cron=

i have spent many hours and am desperate! appreciate your kind advice.

E-Mail privacy proxy for hiding real e-mail?

Do E-Mail proxy services exists to improve privacy and security?

Privacy in the sense that one wouldn’t need to give a website his/her username (possibly even in the firstname.lastname@domain.tld form) and in a security sense that the used e-mail couldn’t be used to log into the e-mail service (thereby making it useless for a leaked password, because the e-mail address couldn’t be used to login).

Example:

john.doe@gmail.com could be someone’s e-mail. If there were a Google Privacy/Proxy service then one could generate as many random e-mails as possible and if one would be sent spam to, or leaked, it could be disabled:

  • abcdef@gmail.proxy
  • 290dcef@gmail.proxy

could both redirect mail to john.doe@gmail.com.

One could be blocked/disabled/removed if wanted without abandoning the real account (e.g. because 290dcef@gmail.proxy has been compromised or spam is being sent to it).

Would it really improve security and privacy? Or am I missing something?

And does such a service exist? (as a bonus, replying from such proxy e-mails would be even better, converting the real account from field to the proxy mail address)

*Real* site crawling with Scrapebox?

So I see SB has the site crawler where you can crawl one domain at a time (a deathly slow process)….or you can use link extractor (over and over and over and over) in an inefficient way to grab most links at a time) or you can use the “search google” method to see what pops up….but

Isn’t there just like a regular ol’ webcrawler?  You give it a list of urls, it spidered through all the links, pulls out the links on a domain, and ding – turkey’s done.

Am I missing something obvious? It seems like such an obvious tool that should be included.  Instead, I find myself now poling aroudn the web to find some alternative.

Any ideas?
Thanks!!

real time data with socket.io

I’m building a bidding web-app and considering the use of websockets to provide latest bid price. I’ve looked at websocket.io and was wondering if this works with Laravel framework and if anyone has it working because I have seen this mainly implemented in Node JS.

Additionally, if I have a single server, serving regular web pages (80/443) can Websockets utilise the same ports?

Thanks

[ Renting & Real Estate ] Open Question : Is my landlord allowed to charge me for removing bloodstained bedding that isn’t mine?

Hi guys, I recently moved into a shared accommodation, and I asked the staff showing me around if they could remove the bed as I would rather bring my own. She said no, as that would mean the room would be left ‘part furnished’ instead of fully furnished. After moving in, I noticed the bedbase (not mattress) is covered in urine and bloodstains. I contacted the lettings to ask if they would at least let me swap the bed for another unoccupied room within the household. The landlord agreed under the condition that I dismantle and reassemble both beds. I agreed.  I swapped, but I was unable to fully dismantle the bloodstained bedbase, and another tenant also offered his help, it turns out we need specific screws to remove the wheels which was the part causing problems moving the bed, there wasn’t enough space to work with. I also found a syringe within the base as it’s torn. Point being, without being able to dismantle this very old fashioned and wrecked bedbase, I could only push it into the opposite and closest unoccupied room (but not the room I swapped the bed with). Fast forward, the landlord is now sending contractors out to put this biohazardous bed into the room it now belongs in the floor below. But he is charging me to move the bed to the floor below. Is he allowed to charge me for this? I asked them to remove the bed before I moved in. I did not cause the stains. The bedbase could put me at risk, and future tenants. Can I get some advice please. (UK tenant).

[ Law Enforcement & Police ] Open Question : In real life, could a burglar use the Home Alone method to rob houses?

In the original movie, Joe Pesci played a burglar who disguised himself as a police officer, and had the following conversation with Macaulay Culkin’s on screen father: Joe Pesci: “I’d like a word with you sir.” Mr. McCallister: “Am I under arrest or something?” Joe Pesci: “Oh no not at all sir, it’s Christmas time, there are always a lot of burglars around the holidays, and we’re just making sure everyones taking the proper precautions, that’s all.” Mr. McCallister: “Oh yes, well we have automatic timers for our lights, dead bolts for our doors, we can’t be too careful if we’re spending the holidays in Paris.” Joe Pesci: “Ah, you’re taking a trip to Paris?” Mr. McCallister: “Yes, we plan to leave tomarrow morning.” Joe Pesci: “Well don’t worry about your home, it’s in good hands.” *Flashes his shady gold tooth smile* Then he knew exactly when the house would be vacant, he knew exactly what they’d be up against when they enter the house, and he knew that none of the neighbors would spot him, because he already had the same conversation with those neighbors who told him of their own holiday travel plans. As long as the burglars don’t run into a crafty kid with a tarantula, could burglars use this method in real life? Dress up as a police officer and get all the information right from the horses mouth?

How can I inject real php code into this website?

So I found a file uploader on example.com. The file uploader accepts every file extension and the file is uploaded inside the directory

/temp/random-numeric-id.php

I tried to upload a php file and it got uploaded, however when I access that file, the content of the file is read as html comment. For example, I uploaded a file with content <?php print(123); ?> and when I visit example.com/temp/111111111.php I see a blank page because my php code has became the following:

<!--?php print(123); -->

Is this some kind of protection mechanism? How can I bypass this to execute my print functionality with php on that server?

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