vibudh is talking

A bullet in my skull

I was lying on a charpoy in a Government hospital with a bullet in my skull and I was bleeding at 3-4 other spots because of the damages done by bullets. I was technically outside the building of the hospital as all the private and the general wards were cramped up by the other patients, of which most of them were the victims of the terrorist attacks that took place in the city that day. The doctors were pretty much amazed to see that I was conscious while they could see a bullet butt projecting out of my skull. I overheard one of them saying that they can’t move the bullet as the bullet had blocked the blood. Ironically, had the bullet not been there, blood would have fountained out of my skull and I would have been dead within minutes. I was waiting on the charpoy for my mother to come and see me after my operation who was already present in that chaotic hospital. As I waited on the charpoy, I spoke to the victimized kids who had gathered around me. Most of these kids were lost and had no idea about their parents. I asked them about their homes but they were more interested in listening to my story of the bullet getting in my skull and how I felt then.
I was on the street about a kilometre away from my home on the auspicious day of ShivRatri, the day on which a huge procession is carried out on the streets of Varanasi, as it is the celebrated as the Wedding day of Lord Shiva himself. I was not one of them who were celebrating amongst the mob, in fact I was waiting there for Maulvi Ji, who wanted to share some information about the terrorist activities which he suspected could take place that day. It was only noon and I could notice that the people were already in full mood for the occasion. One could have a fair idea that a lot of them were dosed by Bhang, as it was that special day of Lord Shiva. Then Maulvi Ji arrived with his burka clad wife and an infant. He seemed tensed and in his panting voice he said, “They are coming and they are going to kill me and my family.” I mollified him and asked him to come with me at my home, which was well guarded and was considerably safe.
While we had just started walking we were joined by the mob celebrating the Shiv Barat. Soon, we saw a Jeep cutting its way through the wave of the mob, it had 5 men with long beard and they were dressed in grey and black kurtas and their head covered with jihabs. One of them pointed his finger at the Maulvi Ji. Before I could do anything to save him or warn him, I saw those men with automatic machine guns squirting bullets in our direction. I immediately got down as I thought I could miss a few shots if I stayed low in height. I felt a bullet making a long cut on my forehead as it went past, merely touching my skin. I got my second short on my left bicep. Soon the mob scattered as I was down on the ground partly covered my other dying bodies. I was motionless and pretended to be dead already. Just before the jeep left, one of them decided to give another spray of bullets with his machine gun. That is when the bullet got stuck in my skull.
After the jeep left, I tried to get up to go to my home. I fell on my first attempt as I realized that it was because I couldn’t move my hand. I somehow managed to get up on my feet and I wanted to rush towards my home and didn’t even want to think how much damage those bullets did to me. Suddenly, I heard a shrill cry of the infant who was covered in the black burka cloth of her mom. I held the infant with one arm as I couldn’t move the other. As I took hold of the baby, it cried loud probably because the way I was handling it made it uncomfortable, but I hardly had a choice. As I walked I realized that if I would keep my head parallel to the ground it would hurt less and there would be lesser blood loss. I was trying to make all conscious efforts to increase the chances of my survival.
My mother was already in the balcony looking for me. She must have got to know about the terrorist attack by those in the mob who had managed to run away. She screamed when she saw me and immediately 4-5 people came for my help as I was still some distance away from my home. I handed the baby to the first one to come for my help and told him that its Maulvi Ji’s baby who is already shot dead, I hoped that he would take the baby safely to Maulvi Ji’s family and also convey them the message. Then my mother inspected me as she cried with agony. I assured her, “I am fine!” That didn’t help much and her groan didn’t stop since then. There was a lot of blood on my body and everyone around me was amazed to see me walking with the infant with my head in the horizontal position. They didn’t realize that a great portion of the blood that was on my jeans and shirt was of someone else, beneath whom I was hiding and pretending to be dead.
I soon got into the car to be taken to the nearest government hospital. When I first saw my face in the mirror I was myself horror-stuck. My face was dripping with blood and I knew it was all mine. I kept my head down (horizontal) for the rest of the journey as I didn’t want to see my face again in that condition. Someone tied a piece of cloth on my bicep tightly to prevent blood loss. I held a towel pressing against my forehead to stop the bleeding and I didn’t allow anyone to touch or inspect my skull, as I realized that the bullet is still popping out of my skull.
As we were travelling I observed that our car never slowed down, considering that traffic jams were common in Varanasi, unless we reached close to the hospital. Probably the city was silenced by these terror attacks. One of our men knew someone in the hospital and had called him to make pre-arrangements for my operation. Despite the huge array of patients in the hospital they managed to get a surgeon, a charpoy and the other basics required for this sort of an operation on an urgent basis. I walk with my men through the pushy crowd to reach the hospital’s garden where my charpoy was kept. This was the place where my operation was to be carried out.
After the operation, I could still feel that cold piece of steel popping out of my head. The surgeon didn’t dare touch it. After spending some time with the kids in the hospital, I realized that my dad and mom have come to see me and they are near my bed. I heard the surgeon tell my parents that I was lucky that the bullet got stuck and had it gone a few centimetres ahead I would have been dead on the spot. To this I said, “It was my hair. Someone got me a helmet made out of my hair to prevent me from such an attack.” (Ref. to the hairstyle in the image below) The gag was supposed to reduce my parent’s stress. As I tried to raise my head to see my dad, the doctor snapped immediately, “Keep your head horizontal and sleep you are not supposed to take much stress.”
The anaesthetics were heavy and when I opened my eyes after a nap I realized that I was not on the hospital charpoy, I was on my bed and it was probably the most horrifying nightmare I ever had. Luckily, all this was just a dream. I then realized why my head was horizontal though most part of this incident as I was laying on my bed with my head in the horizontal position. After a while, I felt good as I got to do some bravery in my dream and more importantly it was an amazing experience to have that bullet in my skull!


In this short passage the author describes a Varanasi based shopkeeper. The description is based on more than a decade old memories of his childhood when the author was about 13 years old.

A tall, fair, middle aged man who had lips always painted with pan stains. A big black mole on his cheek and the most pleasing smile were his prominent trademarks. How can I forget this shopkeeper, I had all my undergarments, thermals, socks, etc. purchased from his shop in my school days. Not only that I remember my mom making all such purchases for my family of four from his shop. His sugar coated words, apt appreciation of his products and his seemingly generous deals were always good enough to convince my mom. I remember that shopkeeper sitting in a slacken posture with his eyes glaring at every potential customer walking on the street. As soon as he sees a customer entering his shop he would immediately spit the pan and hold hands over his huge belly and with the most embracing smile he would say, “Namaste Bhabhiji, kaisi hai?” Mostly his customers were ladies who were alone responsible for most of the household shopping like my mom.

But, the question is, why would a 13 year old kid hate such a shopkeeper? There was a very peculiar thing about his shop, very shaky for the young lad. All the walls of his shops were covered with posters of lingerie girls. An aberrant sight for a teenager who had the curiosity to have a good glimpse of one of those posters while his mom and sister didn’t notice him staring.

The shopkeeper was indubitably a gentleman but those posters in his shop depicted something which was assumed evil by the kid. A mature person would say that the gentleman had those posters perfectly placed as per the marketing guidelines given by the company whose products he used to sell. At times people tend to judge by the outer appearance/actions which they themselves find intimidating without taking into account the reasons behind; this is what separates a mature person and a kid!

Here we are going to learn how to divide an image and save each part into different files. As we have already seen earlier that we can insert a image/profile picture in Facebook chat.
Inserting Profile Picture:
But the size of those images inserted were too small, now if we want to insert larger images in the Facebook chat then we are simply going to insert multiple images alligned properly so that it appears to be a big image, I call it as the ‘Jumbo Image’.

Now we can divide the image manually in the paint and taking equal part at a time, but this method is too tedious and is neither too accurate. So, the simpler way out is to use MATLAB to do the job for us. So here we will be dividing the image into multiple parts(nXm) and then uploading all the images, so that when we insert them in the chat we get a Jumbo Image in the chat box comprising of various small images that we had uploaded earlier.

Here is the MATLAB code to divide a simgle image into multiple parts and saving each part into a different file:

clear; % removes all variables from the workspace, releasing them from system memory
Image = imread(‘’);
%Taking the image from the given URL, it could have been the name of the file with extension if the root folder
n =3; %defining the number of rows
m =3; %defining the number of columns
a=’a’; %defining a random file name
NewImage = ‘newimage.gif’; %granting permission to create a file and write in it
Image = imresize(Image, [512 512]); %resizing the image, this is a mandatory step

rf = floor(512/n); %generating the number of row pixels in the new file
cf = floor(512/m); %generating the number of row pixels in the new file

for v = 1:n
for s = 1:m %nXm files need to be made
startr = (v-1)*rf;
startc = (s-1)*cf;
for i = 1 : rf
for j = 1 : cf
for k = 1:3 %loop for RGB values

Img1(i,j,k) = Image(startr+i, startc+j,k);

a = strcat(a,’a’); %generating a new file name
NewImage = strcat(a,’.jpg’);
imwrite( Img1, NewImage);

It is generally adviced to make a seperate folder in your PC for each Jumbo Image, it simple makes the handing of the files simpler.

For adding profile picture in the facebook chat, all you need do is put the unique id in double square brackets [[ ]]. If you use the name, you might get your friend only if he has a unique name that depends on the facebook database, so it is always advisable to go for the unique Ids.

For inserting my facebook profile picture all you need to do is just type
[[vibudhsingh]] in your chatbox. As my facebook unique id is vibudhsingh.

What is my facebook unique Id?
 Facebook allots all its users a unique Id, that is used to identify its user. It can be seen when you go to the timeline or the homepage of that person/page.

 Here my facebook id is vibudhsingh which is written just after Here are few more examples of the facebook unique Id, hope that helps you better to find out your facebook unique Ids.

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This same technique is used to insert jumbo sized images in facebook chat:

There are some limited sized images that can be used in the facebook chat.

To have them on your chat all you need to do is just copy the stuff below and paste it in your chat:


[[255006724575192]] [[255006727908525]] [[255006737908524]] [[255006734575191]] [[255006731241858]]
[[255006827908515]] [[255006831241848]] [[255006824575182]] [[255006817908516]] [[255006821241849]]
[[255006874575177]] [[255006871241844]] [[255006884575176]] [[255006877908510]] [[255006881241843]]
[[255006934575171]] [[255006931241838]] [[255006941241837]] [[255006944575170]] [[255006937908504]]
[[255007004575164]] [[255007001241831]] [[255006994575165]] [[255006997908498]] [[255006991241832]]
[[255007084575156]] [[255007101241821]] [[255007077908490]] [[255007091241822]] [[255007081241823]]

2. Jack Sparrow

[[298356520217565]] [[298356516884232]] [[298356506884233]] [[298356510217566]]
[[298356513550899]] [[298356620217555]] [[298356606884223]] [[298356616884222]]
[[298356610217556]] [[298356613550889]] [[298356673550883]] [[298356676884216]]
[[298356666884217]] [[298356680217549]] [[298356670217550]] [[298356740217543]]
[[298356733550877]] [[298356743550876]] [[298356730217544]] [[298356736884210]]
[[298356823550868]] [[298356810217536]] [[298356820217535]] [[298356826884201]]
[[298356813550869]] [[298356906884193]] [[298356896884194]] [[298356900217527]]
[[298356903550860]] [[298356893550861]] [[298356950217522]] [[298356946884189]]

3. Superman

[[299528860107644]] [[299528863440977]] [[299528866774310]] [[299528856774311]]
[[299528870107643]] [[299528950107635]] [[299528943440969]] [[299528946774302]]
[[299528953440968]] [[299528956774301]] [[299529013440962]] [[299529016774295]]
[[299529010107629]] [[299529003440963]] [[299529006774296]] [[299529060107624]]
[[299529063440957]] [[299529066774290]] [[299529070107623]] [[299529073440956]]
[[299529173440946]] [[299529183440945]] [[299529180107612]] [[299529176774279]]
[[299529186774278]] [[299529243440939]] [[299529236774273]] [[299529240107606]]

4. Elmo

[[302117289844540]] [[302117283177874]] [[302117276511208]] [[302117279844541]] [[302117286511207]] [[302117366511199]]
[[302117369844532]] [[302117373177865]] [[302117383177864]] [[302117379844531]] [[302117426511193]] [[302117436511192]]
[[302117429844526]] [[302117423177860]] [[302117433177859]] [[302117523177850]] [[302117529844516]] [[302117526511183]]
[[302117536511182]] [[302117533177849]] [[302117606511175]] [[302117596511176]] [[302117599844509]] [[302117593177843]]
[[302117603177842]] [[302117646511171]] [[302117649844504]] [[302117659844503]] [[302117656511170]] [[302117653177837]]
[[302117706511165]] [[302117703177832]] [[302117699844499]] [[302117709844498]] [[302117696511166]] [[302117749844494]]

5. Troll face

[[242538225822042]] [[242538222488709]] [[242538232488708]] [[242538219155376]] [[242538229155375]] [[242538339155364]]
[[242538335822031]] [[242538342488697]] [[242538345822030]] [[242538349155363]] [[242538392488692]] [[242538395822025]]
[[242538399155358]] [[242538402488691]] [[242538405822024]] [[242538475822017]] [[242538472488684]] [[242538489155349]]
[[242538492488682]] [[242538485822016]] [[242538562488675]] [[242538565822008]] [[242538569155341]] [[242538575822007]]
[[242538572488674]] [[242538612488670]] [[242538625822002]] [[242538619155336]] [[242538622488669]] [[242538615822003]]
[[242538675821997]] [[242538682488663]] [[242538672488664]] [[242538679155330]] [[242538685821996]] [[242538742488657]]

6. Mr. Bean

[[255016264574238]] [[255016271240904]] [[255016277907570]]
[[255016267907571]] [[255016274574237]] [[255016384574226]]
[[255016387907559]] [[255016394574225]] [[255016401240891]]
[[255016391240892]] [[255016464574218]] [[255016454574219]]
[[255016457907552]] [[255016461240885]] [[255016451240886]]
[[255016537907544]] [[255016531240878]] [[255016534574211]]
[[255016541240877]] [[255016527907545]] [[255016634574201]]

I hope you guys enjoy it on your chat, I ll shortly tell you how it is done so that you can yourself add a picture of your own in the chat!!

For a system defined by its state space variables, it is possible to determine the controllability, observability and hence the stability of the system using MATLAB. We will be discuss the same here with the help of an example.

A system is said to be controllable if we can transform the state of a system from xo to x(t) with the help of a control function u(t) over a finite period of time. If from measurements of output y(t) taken over a finite period of time, state of  a system x(t) can be determined, then the system is observable.

If a system is both controllable and observable then we can say that the system is stable.

Consider a linear time invariant(LTI) system described by the state equations:

x = A x + B u

y = C x + D u

Here x, y are the state variables, u represents the unit step response and A, B, C, D are the constants which depend on the system.

For a model with Nx states, Ny outputs, and Nu inputs:

  • a is an Nx-by-Nx real- or complex-valued matrix.
  • b is an Nx-by-Nu real- or complex-valued matrix.
  • c is an Ny-by-Nx real- or complex-valued matrix.
  • d is an Ny-by-Nu real- or complex-valued matrix.

sys = ss(a,b,c,d,Tscreates the discrete-time model

with sample time Ts (in seconds). Set Ts = -1 or Ts = [] to leave the sample time unspecified.

Matlab Code:-

a=[0 1 0; 0 0 1; -6 -11 -6];

b=[0; 0; 2];

c=[1 0 0];


sys = ss(a,b,c,d);                                %Creating the state space model

xo=[0 0 0];                                           %Setting initial conditions


step(sys);                                               %for step response

ob = obsv(sys);                                   %for calculating observability

unob = length(a)-rank(ob)             %for calculating unobservability

ct = ctrb(sys);                                      %for calculating controllability

unct = length(a)-rank(ct)                %for calculating uncontrollability

eigen = eig(a)                                        %for obtaining the eigen values


unob = 0

unct =0

eigen = -1.0000



As the system is controllable and observable, hence we can say that the system is stable.

Most of the circuits in Control System today are represented by simple blocks that help us understand the function of each block in a better way. Is also helps the designers to easily make amendments in the circuit for better functionality and testing purpose. But the problem with Block Diagrams is that having blocks and their feedbacks makes the transfer function on the system to tedious to calculate.

Here we are going to study block reduction using MATLAB. The blocks connected in series, parallel and as feedbacks are at times very tedious to compute. MATLAB allows solving of such blocks directly using some functions that is being discussed below with the help of the example. Here we have to calculate C(s)/R(s), that is taken as T(s).

The MATLAB code for the above problem is:

num1 = [1 2];
den1 = [3 1 0];
G1 = tf(num1, den1)                      %Making G1 as the tranfer function
G2 = tf( [2], [1 7] )
G3 = tf( [1 5], [1 6 3 ] )
G4 = tf( [1], [1 0] )

T1 = parallel(G1, G2)                   %as G1 and G2 are in parallel
T2 = series(T1, G3)                       %as T1 and G3 are in series
T = feedback(T2, G4, -1)            %as G4 is the negative feedback

Here we use the tf() function to get the transfer function
parallel() and series() functions according to the requirement
and the feedback() function for feedback.

The output for the above code is as follows:

s + 2
3 s^2 + s

Transfer function:
s + 7

Transfer function:
s + 5
s^2 + 6 s + 3

Transfer function:


Transfer function:
7 s^2 + 11 s + 14
3 s^3 + 22 s^2 + 7 s

Transfer function:
7 s^3 + 46 s^2 + 69 s + 70
3 s^5 + 40 s^4 + 148 s^3 + 108 s^2 + 21 s

Transfer function:
7 s^4 + 46 s^3 + 69 s^2 + 70 s
3 s^6 + 40 s^5 + 148 s^4 + 115 s^3 + 67 s^2 + 69 s + 70

Here we can see that the transfer function for the block diagram is very complex and tedious to deduce. Which can be obtained by using MATLAB very easily.


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