Tag: fails

How to know when Findroot fails to find a solution

My problem is very simple. Assume you have this piece of code :

FindRoot[{x^2 + 1 == 0}, {x, -1, 1}]

Now, this code returns

FindRoot::cvmit: Failed to converge to the requested accuracy or precision within 100 iterations. {x -> -1.}

Which is as expected since the equation has no real root. Now my question is, how can I get the fact that FindRoot failed in a variable ? Say I want to display a message "Failed search", when FindRoot fails for whatever reason, how do I collect the fact that the function failed ? I was looking into Catch[], but it seems that no exception is thrown.

What happens when an unconscious creature fails their saving throw against a Banshee’s Wail?

A Banshee (MM, p. 23) has the Wail action:

Wail (1/Day). The banshee releases a mournful wail, provided that she isn’t in sunlight. This wail has no effect on constructs and undead. All other creatures within 30 feet of her that can hear her must make a DC 13 Constitution saving throw. On a failure, a creature drops to 0 hit points. On a success, a creature takes 10 (3d6) psychic damage.

If someone was already at 0 hit points (for example, having failed their saving throw against a different Banshee’s Wail), what would happen if they fail their saving throw against this Banshee’s Wail (assuming they still need to make a saving throw)?

  • The unconscious creature takes one step towards death, as though they took damage (thus making the saving throw meaningless, since they’d take a step towards death either way);
  • The unconscious creature just dies (unlikely, but in case there’s something written that would imply this hidden in the rules somewhere);
  • Nothing, since this isn’t damage, its just an effect (meaning the unconscious creature would be better off failing this save than passing in this case!)
  • Something else…

Settings API: Setting default option via ‘get_option’ fails

  1. All my options are stored in one array test_hs_options
  2. I have select list settings field ( test_hs_options['duration_months'] ) which stores the selected month (1-12).
  3. For this settings field, I would like to set a default option at 5.
  4. All my attempts at setting the default have failed.
  5. What am I missing?
// Callback for displaying sfield_select_duration. function cb_test_hs_sfield_select_duration() {      // get option test_hs_options['duration_months'] value from db.     // Set to '5' as default if option does not exist.     $  options  = get_option( 'test_hs_options', [ 'duration_months' => '5' ] );      $  duration = $  options['duration_months']; // fails!      var_dump($  options); // PHP Notice:  Undefined index: duration_months      // define the select option values for 'duration' select field.     $  months = array( '1', '2', '3', '4', '5', '6', '7', '8', '9', '10', '11', '12' );      // Display select control     echo '<select id="duration" name="test_hs_options[duration_months]">';         // loop through option values         foreach ( $  months as $  month ) {             // if saved option matches the option value, select it.             echo '<option value="' . $  month . '" ' . selected( $  duration, $  month, false ) . '>' . esc_html( $  month ) . '</option>';         }     echo '</select>'; }

Stored procedure runs fine when executed manually but fails in scheduled job

I have a stored procedure that runs fine when executed manually but fails in scheduled job. The error I receive is: Executed as user: \USER-a. Login failed for user ‘\USER-a’. [SQLSTATE 28000] (Error 18456). The step failed.

My other stored procedures runs fine when scheduled. The only stored procedures that fails are the ones that are written in this form.

SET @QUERY = ‘SELECT * from abc’

EXEC(@QUERY)

In Pathfinder 2e, if a 20th level caster fails to learn a spell, can they never try again?

On page 238 of the Core Rulebook, under "Learn a Spell", the rules state:

Failure You fail to learn the spell but can try again after you gain a level. The materials aren’t expended.

Since character level is capped at 20th, does this mean that a 20th level caster who fails to Learn a Spell can never try to learn that spell again?

Decrypting a password-protected 7z file with Delta filter fails

I have made a 7z archive using Delta filter containing a wav file and I have protected it with a password. I am running a terminal in Kali Linux. My problem is that I cannot get the password cracked using 7z2john.pl and john the ripper. If I omit the Delta compression, using only the default compression of 7z, then the cracking succeeds. My question: is it possible to use 7z2john.pl and john the ripper to crack a password-protected 7z file with Delta compression? If it is possible, how can it be done?

Here are the steps to reproduce the problem:

  1. I use the following command to create the archive:

7z a test.7z *.wav -mf=Delta:4 -peasy

I get this output:

7-Zip [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21 p7zip Version 16.02 (locale=fi_FI.utf8,Utf16=on,HugeFiles=on,64 bits,4 CPUs Intel(R) Core(TM) i5-4460  CPU @ 3.20GHz (306C3),ASM,AES-NI)  Open archive: test.7z -- Path = test.7z Type = 7z Physical Size = 1090 Headers Size = 162 Method = Delta LZMA2:15 7zAES Solid = - Blocks = 1  Scanning the drive: 1 file, 32080 bytes (32 KiB)  Updating archive: test.7z  Items to compress: 1       Files read from disk: 1 Archive size: 1090 bytes (2 KiB) Everything is Ok
  1. I use 7z2john.pl to generate material for John the Ripper to crack the archive:

/usr/share/john/7z2john.pl test.7z > test.hash

  1. I create a word list file containing only the password I gave to the archive:

echo easy > wordlist.txt

Then I try to decrypt the file:

sudo john test.hash --wordlist=wordlist.txt

I get the following output:

Using default input encoding: UTF-8 Loaded 1 password hash (7z, 7-Zip [SHA256 256/256 AVX2 8x AES]) Cost 1 (iteration count) is 524288 for all loaded hashes Cost 2 (padding size) is 3 for all loaded hashes Cost 3 (compression type) is 2 for all loaded hashes Will run 4 OpenMP threads Press 'q' or Ctrl-C to abort, almost any other key for status Warning: Only 1 candidate left, minimum 32 needed for performance. 0g 0:00:00:00 DONE (2020-08-15 07:37) 0g/s 5.555p/s 5.555c/s 5.555C/s easy Session completed
  1. I check if the password has been cracked: sudo john --show test.hash

I get the following output:

0 password hashes cracked, 1 left

So it seems that the decrypting did not succeed. However, I can extract the archive using command 7z e test.7z -peasy so the password should be correct. Also, if I create the archive without specifying the Delta filter using command 7z a test.7z *.wav -peasy. That way, by repeating the steps 1-4 I get the password cracked and am shown the result that the correct password has been found:

$   7z a test.7z *.wav -peasy  7-Zip [64] 16.02 : Copyright (c) 1999-2016 Igor Pavlov : 2016-05-21 p7zip Version 16.02 (locale=fi_FI.utf8,Utf16=on,HugeFiles=on,64 bits,4 CPUs Intel(R) Core(TM) i5-4460  CPU @ 3.20GHz (306C3),ASM,AES-NI)  Scanning the drive: 1 file, 32080 bytes (32 KiB)  Creating archive: test.7z  Items to compress: 1       Files read from disk: 1 Archive size: 1058 bytes (2 KiB) Everything is Ok  $   /usr/share/john/7z2john.pl test.7z > test.hash $   echo easy >> wordlist.txt $   sudo john test.hash --wordlist=wordlist.txt Using default input encoding: UTF-8 Loaded 1 password hash (7z, 7-Zip [SHA256 256/256 AVX2 8x AES]) Cost 1 (iteration count) is 524288 for all loaded hashes Cost 2 (padding size) is 11 for all loaded hashes Cost 3 (compression type) is 2 for all loaded hashes Will run 4 OpenMP threads Press 'q' or Ctrl-C to abort, almost any other key for status Warning: Only 1 candidate left, minimum 32 needed for performance. easy             (test.7z) 1g 0:00:00:00 DONE (2020-08-15 07:49) 5.263g/s 5.263p/s 5.263c/s 5.263C/s easy Use the "--show" option to display all of the cracked passwords reliably Session completed $   sudo john --show test.hash test.7z:easy  1 password hash cracked, 0 left

Getting and setting CSS variables with JQuery in WordPress backend fails

On a WordPress settings page of a plugin I develop, I have to implement a visual element that I want to change by JavaScript. I’ve got my solution working as it should and tested it on code-pen and JSFiddle. But when loading the equivilant code including the script, it will not work.

Here is the schema I’m using: HTML

<div id="origin" class="box"></div> <div id="target" class="box"></div> <button id="toggle-color">Toggle Color</button>

CSS

:root {   --origin-color: red;   --target-color: blue; }  .box{   width: 150px;   height: 150px; }  #origin{   background-color: var(--origin-color); }  #target{   background-color: var(--target-color); }

JS (jQuery 3.4.1)

(function( $   ) {     'use strict';     $  (document).ready(function(){               $  ('#toggle-color').on('click', function(event){         event.preventDefault();         var root = $  (":root");         var origin_color = '--origin-color';         var target_color = '--target-color';         var origin_value = root.css(origin_color);         var target_value = root.css(target_color);         root.css(origin_color, target_value);           root.css(target_color, origin_value);         return false;       });   });     })( jQuery );

The Problem I have is, that while it is working in test environments in the WordPress backend, the lines where I fetch the colors with

var origin_value = root.css(origin_color); var target_value = root.css(target_color);

returns ‘undefined’, so the next line where I switch the colors fails.

See my example here: https://jsfiddle.net/tomybyte/hvbc3zu1/6/

I don’t understand why it is working in JSFiddle and code-pen but not when loading in WordPress (yes the code is loaded, I checked that!)

Postgresql: Refreshing materialized view fails with “No space left on device” and a huge spike in disk usage

I have a materialized view that refreshes every five minutes. The SQL aggregates the data among many tables with over 800k rows in each.

However, the when using the "REFRESH MATERIALIZED VIEW CONCURRENTLY tableName", the query runs for about an hour and then complains: ERROR: could not write block 39760692 of temporary file: No space left on device

It should be noted that this 39760692 changes every time I execute the query.

The disk size is about 960 GB and the database size is about 30 GB. So the disk has a free space of about 930 GB.

I noticed that when running the refresh query, there is a huge spike in the disk usage of about 12GB per minute and then finally the query errors out with no space error when it hits the 960 GB mark. Immediately, the disk usage is back to 30GB from the abnormal growth.

I even tried the REFRESH MATERIALIZED VIEW tableName (without concurrently) and seeing the same behavior.

I’m not sure what can be done here to diagnose the problem.

How can giving skill checks critical fails and successes affect game balance?

At my table there is the house rule that skills can crit on a natural 1 and 20.

At least I think a natural 20 would be treated special over a 19. But I do know that 1’s give harsh consequences.

In my last session I rolled natural ones on 2 separate skill checks.

One was a Perception check to listen to the mutters of nearby NPCs, I rolled a natural 1(I had a +6 to it) and the DM said I was talking so loud that all the other PCs had to do their checks at disadvantage.

The second time I rolled insight to see if i could figure out about how badly our setting the dock ablaze affected an invading orc army, whose ship was also set on fire. I rolled a natural 1(+6) and the DM said I did not think it had any effect at all and was going to be frightened for the 1st 3 rounds of the next encounter.

I’m all for having fun and silly things with low skill rolls. And am ok with these harsh consequences if everyone at the table are for the most part. But I feel this kinda screws over bards and rogue who get expertise.

Continuation of another question.

If dbo.DatabaseIntegrityCheck fails, what happens, i.e. how am I notified?

I’m new to Ola Hallengren’s MaintenanceSolution (which looks fantastic), and DBA-ing generally. I’ve created a job to run dbo.DatabaseIntegrityCheck (weekly against ALL_DATABASES). If there are errors found by DBCC CHECKDB does this cause the proc to error and therefore the Job to fail, so I’ll get a notification in the normal way from my job failing? Will it continue to verify the integrity of all the other databases or does it stop on the first problem DB it finds?

I couldn’t find any notes on the overview, sorry if I missed something obvious.