equation solving – Duplicate RowReduce function

Writing:

AA = {{a, b, c, d}, {e, f, g, h}, {i, j, k, l}};
AAold = AA;
nn = Length[AA];
For[ii = 1, ii <= nn, ii++,
    If[Quiet[IntegerQ[AA[[ii, ii]]^0]] == False,
       kk = ii + 1;
       While[kk < nn && Quiet[IntegerQ[AA[[kk, ii]]^0]] == False,
             kk = kk + 1
            ];
       If[kk > nn,
          Print["Singular matrix"];
          Abort[]
         ];
       For[jj = 1, jj <= nn + 1, jj++,
           ll = AA[[ii, jj]];
           AA[[ii, jj]] = AA[[kk, jj]];
           AA[[kk, jj]] = ll
          ]
      ];
    For[jj = 1, jj <= nn, jj++,
        If[ii != jj,
           ll = AA[[jj, ii]]/AA[[ii, ii]];
           For[kk = 1, kk <= nn + 1, kk++,
               AA[[jj, kk]] = AA[[jj, kk]] - AA[[ii, kk]] ll
              ]
          ]
       ]
   ];
For[ii = 1, ii <= nn, ii++,
    AA[[ii, nn + 1]] = AA[[ii, nn + 1]]/AA[[ii, ii]];
    AA[[ii, ii]] = 1
   ];
FullSimplify[AA == RowReduce[AAold]]

I get

True

and the same if I define:

AA = {{0, b, c, d}, {e, f, g, h}, {i, j, k, l}};

or:

AA = {{0, b, c, d}, {0, f, g, h}, {i, j, k, l}};

On the other hand, if I define:

AA = {{0, b, c, d}, {0, f, g, h}, {0, j, k, l}};

I would expect as output:

Singular matrix

when I get error messages instead. Could anyone kindly tell me how to fix this code without twisting it?

Thanks!

Deleter more than 50 e-mails in gmail in 2020 [duplicate]

Last time when I selected the e-mails on a page to delete, after selecting 50, gmail offered that it could mark all the e-mails having that label.

Now it does not.

How can I select all that 9000 e-mails now?

Repeating keyword twice in a URL effects SEO or not? [duplicate]

What will be the correct format for my URL (Here, I am trying to target the keyword ‘abcxyz’):

www.abcxyz.com/abc-xyz.php/……………….

www.abcxyz.com/custom-abc-xyz.php/…………

Please suggest if any one is correct or not for my website?

Concentration and Shapechange 5e [duplicate]

I’ve been trying to make use of the Shapechange spell as a 9th level spell with a Druid class, but concentration seems to be a major issue. Say I transform into a Phoenix, can I use the 3 Legendary Resistance to automatically succeed in a damaging saving throw three times to prolong the form? This would make Shapechange viable for melee characters for atleast a slightly longer period than a single turn.

What happens if user generated content is duplicate?

Advertising

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How to explain income from an unregistered business when applying for UK Visitor visa? [duplicate]

I’m a student, my parents and other relatives send me money, but I also have an online clothing store I started this year. Because it’s online and upcoming I haven’t registered it.

Should I explain this in my cover letter, incase they notice a deposit that is not in my parents name?

count duplicate entries sharepoint – SharePoint Stack Exchange

I need a little help please.
I’m using SharePoint 2013, with no SharePoint designer (disabled by the administrator).
I have a list, in which a have duplicated entries in a column named Title. I need to count those duplicates so I can apply a filter and view just those who have 3 or more occurrences. is it possible?

office365 – Excel – Different highlighting for different pairs of duplicate values

0

I have an Excel file that contains the data of a website’s users. In column A I have their username, and in column B I have their email address. Unfortunately, there are many duplicates: both inside the same column, and across.

Example:

  1. Thelegend28 | myemail@gmail.com
  2. timmyhs | timmysdademail@gmail.com
  3. l33tu53r | iml33t@live.com
  4. Thelegend28 | duplicatemail@hotmail.com
  5. 2l33t4u | iml33t@live.com
  6. timmyhs | timmysdademail@gmail.com

As you can see, not only do I have users that are registered twice with the same username and email (2. and 6.), but I also sometimes have different unique usernames linked to the same email (3. and 5.) and usernames that are linked to more than one address (1. and 4.).

What I need to do, if possible, is format these three occurrences differently.

Of course, any help is greatly appreciated. I’m just a noob, but I’m trying to learn. Thank you all in advance.

How to duplicate UpValue of one function to another?

Let’s say I have defined a function zO for the following up-values

zO/:zO[x_]+zO[y_]:=zO[x+y];
zO/:zO[x_]+zo[y_]:=zO[x+y];
zO/:zO[x_]-zO[y_]:=zO[x+y];

Now I want to define another function zOE which have the same up-values. How can I do this without copying and modifying the above rules?

Limit number of hotspot users [duplicate]

How to limit number of users who can connect to a hotspot.Talking about an Android tethering hotspot.I do not want more than one device to connect.