the matric

The law presentation went pretty well since I hadn’t to talk haha. But I haven’t done anything productive the whole day so, tomorrow, I am not sure whether going to a class or not, that way I can get things done. In that class, tomorrow we are going to learn MATLAB and I think I am pretty versed in since I have taken 3 classes where we used it. I mean I used MATLAB for robotics and computer vision I THINK I can make matrices and loops in MATLAB (which’s the tomorrow lecture’s level). The bad thing is that I have to ask some doubts to my professor and, probably, we have to do an important problem set, so I should go.
I am reaching a new level of tiredness, I can’t believe how tired I feel everyday after getting home at 9pm. I wake up at 7-8am then go to university, goto class, study in the library, start/finish projects with 5 different teams, study English, take 2-3 buses, etc. I can’t wait to be independent and have my own stuff and have a better routine.
But, for now, I am just going to sleep more because I can’t get anything tomorrow being sleep deprived. So.
Good night (morning or afternoon)!🌙

Why on earth is matrix multiplication NOT commutative ? – An Intuition

One is commonly asked to prove in college as part of a linear algebra problem set that matrix multiplication is not commutative. i.e If A and B are two matrices then :

But without getting into the Algebra part of it, why should this even be true ? Let’s use linear transformations to get a feel for it.


If A and B are two Linear Transformations namely Rotation and Shear. Then it means that.

Is that true? Well, lets perform these linear operations on a unit square and find out:

(Rotation)(Shearing)

(Shearing)(Rotation)

You can clearly see that the resultant shape is not the same upon the two transformations.

This means that the order of matrix multiplication matters a lot ! ( or matrix multiplication is not commutative.)

Have a great day!

anonymous asked:

Why do you hate the idea of "internalized anything? "

It’s a silly way of understanding marganilization in my opinion. Interactions take place within matrices of marginalization and material relations- the identities of the people engaging in the interactions are important but not terribly so, and certainly they are not so separable that they need their own term. So for instance, let’s say a black woman passes me by for a job and gives it to a white woman who’s less qualified, just because of things she assumed because she is black. The interaction between us takes place under the matrix of racism (I am denied access to material resources specifically due to my race) and that wouldn’t change if the woman denying me the job was Latina, or white- either way, my NOT being white and that being the determining factor here makes the interaction racist. Calling this an instance of “internalized racism” not only shifts the focus to that woman’s particular feelings (which honestly, they matter but in the whole scheme of the interaction, I don’t care) but also makes it seem as though this racism exists inside her, and is a personal problem, and not the result of being born and baptized in a racist system which has tainted her worldview. So had a white woman done the same thing, she would also be doing it because she had “internalized” the logics of racism- we all “internalize” these logics and have to work toward seeing them as ideology rather than truth. Racism isn’t internal, it’s external, and racist interactions occur within it- not just between individuals. Of course we should have special sympathy for people of color who seem especially impacted by racist thought in a way that makes them hate themselves. But for one thing, they aren’t internalizing anything that other people don’t (it just hurts other people less because it isn’t about them) and for another, we need to focus on the system at work.


I get the idea, I really do. And I sympathize with it. I do think women enacting misogyny in our interactions with each other comes from a different emotional place than when men do the same thing, and I think this deserves recognition. But at the end of the day, one woman not “internalizing” misogyny doesn’t make patriarchy go away. So I’m not terribly interested in the idea that marginalized people’s interactions with systems are different in this particular sense- they’re not really, but we stand to be hurt a whole lot more by them than people who aren’t the targets of those systems. I think a lot of my reaction is just visceral, a reaction to this idea that the problem lies within a particular person rather than in broad material structures. It feels nice, but doesn’t hold much political weight.

Basis Vectors are instructions!

Basis vectors are best thought of in the context of roads.

Imagine you are in a city - X which has only roads that are perpendicular to one another.

You can reach any part of the city but the only constraint is that you need to move along these perpendicular roads to get there.


Now lets say you go to another city-Y which has a different structure of roads.

In this case as well you can get from one part of the city to any other, but you have to travel these ‘Sheared cubic’ pathways to get there.

Just like these roads determine how you move about in the city,

Basis Vectors encode information on how you move about on a plane.


What do I mean by that ?

The basis vector of City-X is given as:

This to be read as - “ If you would like to move in City-X you can only do so by taking 1 step in the x-direction or 1 step in the y-direction ”


The basis vector of City-Y is given as:

This to be read as - “ If you would like to move in City-Y you can only do so by taking 1 step in the x-direction or  1 step along the diagonal OB ”


Conclusion:

By having the knowledge about the Basis Vectors of any city, you can travel to any destination by merely scaling these basis vectors.

As an example, lets say need to get to the point (3,2), then in City-X,  you would take 2 steps in the x-direction and 3 steps in the y-direction

And similarly in City-Y, you would take 1 step along the x -direction and 2 steps along the diagonal OB.

Destination Arrived :D

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DAY 6/100 OF PRODUCTIVITY // DAY 1 OF APRIL STUDY CHALLENGE // 1 APRIL 2017

HEY ITS APRIL. i napped for the entire afternoon after math tuition because i was so shagged. but kinda made up for lost time at night, did my matrices notes at abt 1am. so i was pretty productive. but body clock messed up hahaha

so, “what’s going on this month?” i’ve got a batam trip on the 14th to i think 16 april. and after that i have my O level bio SPA so stress!! but there r other days like careers day (7th) to see polytechnics and JCs in our school for talks and i think that’s abt it actually.

gonna sleep now (it’s almost 4am) so i can get up at abt 9-10am (hopefully) and get my life back on track by finishing up my homework for school and tuition for tomorrow afternoon (i still have like half of it to finish)

goodnight everyone and i hope y'all had a great 1st april. oh and happy april fools!

xo,
Pre [@konstanly-studying]

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I am proud to announce three brand-new scents of fursuit spray are joining our product line!

First off is Salty Dog, label art featuring Matrices! This is the perfect smell if you love the scent of soggy kelp and dead fish. That combined with that unique aroma of wet dog fur makes this spray truly special!

Second new addition is Faux Twenty, featuring my friend Laila’s caracal character. This spray is PERFECT if you want to smell like pot but you’re too square to smoke. Come on, buy a bottle… everyone’s doing it! Dank!

Third is the ever-classic Furry Trash, featuring Synchra’s opossum character Gwen! When you feel like a hot mess, you should SMELL like one too, and this spray lets you do exactly that. Elements of moldy banana and rotten meat combine with overtones of damp mildewy wood to create an authentic imitation of a garbage dump on a sunny day.

These fursuit sprays are coming to my shop SOON, so look forward to it! Which scent are you most excited for?                    


“I’m bad at math.”

I hear this a lot. You probably do, too. H*ck, you might even say it, some of you ( though, I really hope not). I’ve heard it from countless people, and I have never once observed it to be true. That keeps me asking the same question: “What is the education system doing to people that makes them keep saying this, and (for god’s sake) WHY?”

I think a big part of it is that math is taught bassackwards. I’ve been righteously indignant from the moment I learned that all groups are the same thing. Vector spaces and addition of integers and multiplication of reals and putting square pegs in square holes are all EXACTLY THE SAME. Matrices and polynomials? Might as well be the same sentence in different fonts. I could put shapes in matching holes before I could speak, so why did I have to wade through seemingly disjoint topics in mathematics for 10 years before we brought up D_n? I had the prerequisite knowledge for the dihedral group when I was 4 years old, but I didn’t get to learn about it until I was in my 20′s. And that’s not okay. 

I want to figure out why the educational system obfuscates mathematical topics to such an unreasonable extent as to teach them as separate topics. I want to figure out why and then I want to stop it forever. No wonder grade school kids struggle with a subject where they’re taught, say, four methods per topic to approach four topics - that’s 16 things to learn about ONE STATEMENT. No wonder that great abstract thinkers like Newton and Einstein and Franklin disliked the earlier years of school and reportedly received poor-to-average grades. Of course students are puzzled when they inherit snippets of mathematical knowledge like parts proffered at auction with no hint as to what the whole machine could do when assembled. And no wonder why they ask statements like, “what will we ever use this for?” I don’t know, kid. I’m not allowed to tell you because the school board believes abstraction will cause a lawsuit. It makes me want to cry.

So, in summation, here’s what I say when someone tells me they’re bad at math: “You’re not bad at math. Your school board is. Your legislators are. And you don’t have to agree with their goddamn opinion because they’re no sort of authority on that topic.”

Pubblico non pagante

Ma sinceramente, chi siete? Non chi siamo noi, esseri umani, chi siete voi. Prendetevi un momento, sollevate le dita dalla tastiera, fatevi la domanda “chi sono io?” E… osservate.
Quante parole di canzoni vi sono venute in mente per descrivervi? Quante citazioni da libri? Quante immagini da film? Quante parole dette, scritte, pensate da altri vi sono saltate alla mente per descrivere i vostri stati emotivi e fisici, la vostra identità, il vostro essere?
E di vostre? Di parole dette, scritte e pensate da voi, quante?
E quando parlate della vostra vita, la descrivete con parole vostre, o con prestiti da altri? I vostri amori, vi appartengono, o sono il riflesso di canzoni, film, libri, o peggio ancora citazioni degli amori degli altri, delle descrizioni degli altri, copie sbiadite che voi tenete su una pagina di diario o appese alla parete, cercando di vivere ogni giorno come se fosse l’imitazione della “famosa frase di”, “di quella cosa che ho letto lì” “di quel ritornello che dice così” “di quella scena che sta al minuto”?
Perchè in queste domande, si vede dove siete finiti, si vede la strada che avete percorso per allontanarvi dalla realtà, si vede la matrice, la natura del vostro linguaggio, e parte di tutti quei problemi di non comprensione, di mancata accettazione, di difficoltà d’integrazione.
Non siete un film.
Non siete un libro.
Non siete una canzone.
Potete essere la somma di tante cose, di ognuna di queste cose, ma le vostre parole non devono essere la ripetizione stantia di cose dette da altri, devono essere vostre.
Quando parlate, quando descrivete, dovete sentire la carne, il sangue, il respiro, dovete ricordare mentre parlate che aria tirava quel giorno in cui avete vissuto, il sapore di quel bacio non può essere quello che l’autore generico X scrisse in quel libro, perchè porca puttana non era lui a baciare quel giorno quella persona, eravate voi, e solo voi sapete che sapore avessero le sue labbra, solo voi avete assaggiato le vostre lacrime quando vi sono scese sulla guancia, solo voi avete sentito il suono della risata dei vostri amici, o lo schianto nel cuore quando vi siete sentiti traditi, non c’era un cronista con la penna ed il blocco degli appunti pronto a trasformare tutto in poesia.
Eravate voi quella cazzo di poesia, e vi è rimasta dentro, e sta ancora lì che vi gira nel corpo, vi vibra nelle mani, vi ronza nella punta delle dita e sotto la lingua, e voi non la fate mai uscire perchè chiedete sempre ad altri di descrivere le vostre storie, chiedete sempre ad altri le parole per la vostra vita.
Ma come potete diventare qualcosa, se rifiutate di ascoltare il seme del vostro stesso linguaggio, la nascita delle vostre stesse parole, di tutte le descrizioni, le metafore, se avete paura che vostro figlio sia brutto e quindi non siete disposti ad amarlo semplicemente per il fatto che è una vostra creazione, è qualcosa che è vostra, è qualcosa che partecipa alla vostra identità più di qualsiasi altra cosa troverete, è la vostra storia, la vostra vita, siete voi e vi state arpionando dentro il vostro stesso corpo per paura di guardarvi in faccia, ma lo capite quanto male vi state facendo a ripetere sempre le stesse parole, le stesse frasi, le stesse citazioni, ma vi accorgete di quanto rimanete fermi sul posto solo perchè è più facile dire a qualcuno “mi descrivi questa cosa?” “mi fai rileggere questa storia?” piuttosto che dire a voi stessi “io cosa ricordo di questo sentimento? Cosa ho provato quel giorno? Chi ero quando ho vissuto quel momento?” E poi dirlo, scriverlo cazzo, trasformarlo in un’emozione che possiate rivivere quando volete, sia che faccia male, sia che faccia bene, ma che sia solo vostra e di nessuno.
Ma volete davvero diventare solamente quelli che in silenzio e ai margini leggeranno le vite vissute da altri?
E’ così sbagliato rischiare di vivere, una volta tanto?

Mini-Guts

intestinal stem cells can be cultured in specialised matrices to form enclosed mini-guts which closely resemble the intestinal epithelium. These may then be used to screen small molecules to identify drug targets and may be genetically manipulated in a similar way to other cells in culture. 

I will be using these during my PhD to examine the effect of a candidate cancer drug on cells of the gut.