[University Math] Does anyone know how to put these equations into a 3x3 matrix
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πŸ‘€︎ u/DR-SNB
πŸ“…︎ Jan 15 2022
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Are there any people that, β€œLOVE MATH” who would want to dip their toes into this matrix? It’s provocative to say the least! 11MM vs. 700k and we have 10k more online? lol reddit.com/gallery/ryqvv8
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πŸ‘€︎ u/whitnet1
πŸ“…︎ Jan 08 2022
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How well did Engineering @ UIUC teach you linear algebra (/matrix math?)

I went here for undergrad and now for phd and I feel like I can't do any linear algebra whatsoever. Could be my fault but I also feel like they give us little help with math 225. I'm very curious about the general sentiment among engineering people. (Math people... I am hoping you had a better experience.)

Note: if you're one of the couple people I've been complaining to about lin alg all day today, I'm sorry you had to see it on reddit too. :| I'm a whiner

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πŸ‘€︎ u/chell0wFTW
πŸ“…︎ Oct 20 2021
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Glitch in the matrix [math meme]
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πŸ‘€︎ u/JustOneRandomPhil
πŸ“…︎ Nov 25 2021
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TwinCAT Matrix Math Library

I got tired of hacking together simple matrix multiplication every time it came up, so I finally bit the bullet and made a comprehensive matrix math library for TwinCAT 3: TcMatrix.

I've used the siemens matrix functions before, and I was able to find a codesys library when googling that seemed pretty similar. Is anyone here familiar with matrix libraries for other platforms? I'd love to evaluate them and compare features.

This was also kind of an excuse to play around with dynamic memory allocation in TwinCAT and the TcUnit framework. Both were a lot easier than expected, so I think I might use them more in the future and encourage others to use them as well!

I have a few other libraries in the works, so any other style or documentation feedback would definitely be appreciated! The one thing I wish I could figure out is how to export the in-code documentation from TwinCAT so I wouldn't have to document everything twice :/

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πŸ‘€︎ u/burkeyturkey
πŸ“…︎ Oct 22 2021
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Can you perform matrix math operations with DAX inside a calculated column?

I suppose it's technically table operations rather matrix operation but same idea: I want to mark dates without explicitly typing each date.

Say I create a table using a variable:

Cyber Monday =

var cm_dates = {Date(2021, 11, 29), Date(2020, 11, 30), Date(2019, 12, 02)}

... And I want to look at 7 days before, the day of, and 7 days after each Cyber Monday of their respective year. So the day after row would be 2021-11-30, 2020-12-01, ans 2019-12-03 and then day before row would be 2021-11-28, 2020-11-29, and 2019-12-01.

Continuing and doing either of the below don't work:

--attempt 1

RETURN Switch(true(),

Calendar[CalendarDate] IN cm_dates, t0 -- this line is fine

Calendar[CalendarDate] IN dateadd(cm_dates, 1, day), t1, -- this does not

Blank() )

--attempt 2

RETURN Switch(true(),

Calendar[CalendarDate] IN cm_dates, t0 -- this line is fine

Calendar[CalendarDate] IN dateadd(cm_dates, {1,1,1}, day), t1, -- this does not

Blank() )

The formulas, if they worked, would have more rows so that itd range from 14 and - 14 based on cm_dates, but since it doesn't I just kept it like this for brevity.

Im drawing a blank here.

Any ideas?

Editted the DAX part for readability

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πŸ“…︎ Nov 30 2021
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So I’m trying to follow along with what’s going on in this example, but I think the math is kinda confusing. How did inverse of sI-A get us the resulting matrix?
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πŸ‘€︎ u/ranych
πŸ“…︎ Nov 11 2021
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[CompSci/Math] Matrix Computations and algorithms EXAM [100$ BTC ETH]

First post here!

Date and Time: 10/29/21 11:00 UTC.

For more info, send DM.

Will provide with exam scope, and some handouts to check on.

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πŸ“…︎ Oct 27 2021
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Rendering Math: How do I reflect a view matrix about a plane to create a mirror?

Suppose I want to render a mirror in a scene. I have my view mat4 and the model mat4 for some mirror plane. I need to create a new view mat4 that is reflected about that plane to render objects reflected in the mirror. For some reason I can't find any description of how to create is new matrix - I tried adapting code from this portal tutorial and simply using the same object matrix for src and dst (i.e. the plane is a portal to itself) but doing so creates a view matrix that seems to be oriented incorrectly for a mirror.

What's the trick to getting the matrices to render a mirror?

I tried this (code uses GLM, camView is the regular camera view matrix and node.getCachedWorldTransform() gets the model matrix of the mirror plane):

            auto pCam = camView * glm::inverse(node.getCachedWorldTransform()) * glm::rotate(glm::mat4{ 1.0f }, glm::radians(180.0f), glm::vec3(1, 0, 0))  * node.getCachedWorldTransform();

But it does not seem to work, nor do variations that more closely match the OpenGL wiki tutorial

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πŸ“…︎ Nov 22 2021
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[University Maths: Matrices] Solving matrix with infinite solutions.

From the matrix below, there exist infinitely many solutions to be written the given form, also below. I have to find this equation for solutions where Ξ» and ΞΌ are real numbers, and I’m struggling on where to start with such a large matrix. I’ve tried on smaller (3x4) matrices, by substituting in a value for the variable not given (z in that case) but I’m unsure how to approach this question. Do I substitute more values in? Altogether or one at a time? I’ve broken it into the 3 simultaneous equations already.

Matrix

Form

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πŸ‘€︎ u/SorenKingsman
πŸ“…︎ Nov 02 2021
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What does it mean to say a disease test is 'accurate'? There are in fact 4 measures: accuracy, error, sensitivity and specificity, all of which can be displayed in something called a 'confusion matrix'. Learn more about the maths behind disease testing in this article from TRM intern Amie Campbell. tomrocksmaths.com/2021/11…
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πŸ‘€︎ u/tomrocksmaths
πŸ“…︎ Nov 22 2021
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[College math: Algebra]I tried to solve this matrix with everything (I even used online calculator) still wrong

I tried to solve it with many methods still same answer You can see the question and my answer in the pic Plus what does he mean by matrix without hyphen(I think he means the horizontal line in matrix)

I tried with Cramer and it give : X1= -202/13 X2= 29/13 X3= -5/13
Still wrong

https://imgur.com/a/F1DOtJD

If anybody got any idea this would be a big help

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πŸ‘€︎ u/ssal1234
πŸ“…︎ Nov 01 2021
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Hello, for further maths I had this Matrix question where I got kind of stuck on, not sure how to solve it.
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πŸ‘€︎ u/Rif02
πŸ“…︎ Sep 05 2021
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Matrix problem in math

Was pretty early like 20ish. Was it literally just adding each place that corresponds?

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πŸ“…︎ Sep 11 2021
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[Year 11 General Maths: Matrices Simultaneous Equations] Need help understanding how to just write simultaneous equations from worded problems (in algebraic form not matrix form)

Hi- so I know how to solve simultaneous equations in matrix form but I had my first period of my SAC today (Australian assessment) and noticed that the two last problems I need to first write simultaneous equations in algebraic form which I have really struggled with. I have my last hour to work on it tomorrow. I try to write them out but it never makes sense because I cant use the process of elimination or substitution on them. Because it is an assessment I don't have the questions but I can do a random example:

(I know it was about basketball tickets) "Non-members and members pay a different amount for a ticket at a basketball game but it also depends on the round of basketball Round 1 Non members pay $37 Members pay $23 Round 2 Non members pay $46 Members pay $35, Round 1 totalled $5487 and round 2 totalled $3567 how many tickets were sold (im not sure exactly of the question)"

What I am struggling with is actually putting this into an equation form not matrix form. I had an idea that I could go based off of my matrix form and just kind of deconstruct (work backwards)

Thank yall so much

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πŸ‘€︎ u/FileOwn2034
πŸ“…︎ Jul 29 2021
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[Year 11 General Maths: Matrices Simultaneous Equations] Need help understanding how to just write simultaneous equations from worded problems (in algebraic form not matrix form) /r/HomeworkHelp/comments/…
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πŸ‘€︎ u/FileOwn2034
πŸ“…︎ Jul 29 2021
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Hi all, what would you say is there minimum math prerequisites to start MS Statistics? What is the desired prerequisites (I.e. in addition to minimum). Saw some programs require only calc 2 and matrix algebra, but that seems a bit light? What are your thoughts?
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πŸ‘€︎ u/yev_cplusplus
πŸ“…︎ Jul 01 2021
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D07 MATH MATRIX

There was a question about matrices where it was like -4 times the 4x4 matrix. was the answer matrix just -4 multiplied by each of the numbers in the matrix?

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πŸ‘€︎ u/youfoolslol
πŸ“…︎ Jul 18 2021
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Detailed explanation of Transpose of Matrix and questions based on NCERT Solutions of Exercise 3.2 of Chapter 3 Matrices Class 12 Maths explained by expert teacher as per CBSE (NCERT) book guidelines. youtube.com/watch?v=zYGOq…
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πŸ‘€︎ u/prerna-kharbanda
πŸ“…︎ Aug 09 2021
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[Hiring] (Online) Math tutoring (matrix algebra + diff equations)

Hi, I'm looking for someone to help me with math tutoring / problems.

It's mostly diff equations and matrix algebra.

If interested please send me your rates.

Thanks! :)

$50-100 per session

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πŸ“…︎ Apr 21 2021
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Detailed explanation of Transpose of Matrix and questions related to NCERT Solutions for Exercise 3.2 Matrices Class 12 Maths explained by expert teacher as per CBSE (NCERT) book guidelines. youtube.com/watch?v=zYGOq…
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πŸ‘€︎ u/prerna-kharbanda
πŸ“…︎ Jul 31 2021
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Introducing my Matrix math homework.
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πŸ‘€︎ u/Bobguyawesome
πŸ“…︎ Feb 01 2021
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Comedy gold: Redditor proves that Craig doesn't understand high school level Matrix math by showing he incorrectly thinks Matrix multiplication is commutative. BSVer who's been lying about having credentials in math argues that Craig's math is right. reddit.com/r/bsv/comments…
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πŸ‘€︎ u/Zectro
πŸ“…︎ Mar 31 2021
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[EXCEL] - Library of Matrix and Vector objects for math in VBA

If anyone uses VBA to do complex math, I'm working on an object-based VBA Math library. I currently have Matrix and Vector classes implemented.

Beakerboy/VBA-Math-Objects: Object-Based mathematical operations in VBA (github.com)

I've used these objects to create a Principal Component Analysis object as well, in another repository:

Beakerboy/VBA-Projects: Calculate Confidence intervals, Confidence Ellipses, and LOESS Smoothing. (github.com)

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πŸ‘€︎ u/TheRealBeakerboy
πŸ“…︎ Apr 13 2021
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Math 251 (Matrix Algebra) Summer Term

I’m not exactly sure, but I think Math 251 I’m taking this summer term is like 4 weeks, 5 days a week. Which is like 20 class days, I know the classes are longer, but still, has anyone taken this version of 251 in the summer and is it doable alongside a light asynchronous gen Ed? A buddy of mine says the class isn’t hard, but still 28 days to learn all that material is crazy.

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πŸ“…︎ Mar 20 2021
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Math Breaks Matrix

The Average from The Test is 234 000 Ounces of 201 people votet. That's an average about 1 100 Ounces Silver per person. That means 1 100 Ounces X 51. 500 Apes = Around 60 Million Ounces of Silver - >worth more than 1, 5 Billion dollar ( to 30$per Ounce). If the Price will rise up to 150 Dollar per ounce and at this time 100.000 Apes are buying silver - >

100.000 Apes x 1000 Ounces Per Ape x 150 $ per Ounce = Error - System Failure

1, 5 Trillion Dollar

This will break the matrix and will Change the world Into Planet of The APES!

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πŸ“…︎ Apr 10 2021
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Why Isometric? | Art, Code and Matrix Maths | A Devlog youtube.com/watch?v=0fZXl…
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πŸ‘€︎ u/Chii
πŸ“…︎ Aug 15 2020
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