Bit Definition and 380 Threads

I am trying to compile PROPEP for 32 bit systems. (Martin-Marietta FORTRAN program for chemical equilibrium) It was originally written for IBM professional FORTRAN version 1.00 I can compile with the IBM 1.00, so I know my source code is valid. I have tried G77 with loads of errors...

Hey guys I've been working on this program for just over a week now and I just can't seem to find any way around my problem. The problem I'm having is: I'm trying to add 32 bit numbers together and if there is an overflow then I'd like to find a way to output the result as a 64 bit number...

Greetings, I currently have a laptop with Windows Home 7 32 bit. I would like to move to 64 bit so I can upgrade the RAM but I would rather not start from scratch. is there a way to load the 64 bit version onto my laptop without wiping out my current programs and settings? any info you...

"It from bit" or "Bit from it" I've always had some difficulties understanding the whole concept of information: Is matter really just information? Does one mean just our information about matter? Isn't all information embodied in some more basic "physical" stuff? Doesn't information...

I tried the following code: def factorial(n): if (n == 0): return 1 else: return n*factorial(n-1) def ncr(n,r): return ((factorial(n))/(factorial(r)*factorial(n-r))) number = 0 for n in range(100): for r in range(100): print ncr(n,r)...

I graduated in 2008 with an EE degree and entered grad school immediately after. I excelled and did ok in my classes and research but I knew I wasn’t doing as well as I could have been doing (got a couple B minuses too). At the end of the first year I started getting paranoid that I was going...

Fourier Transform help! (bit urgent) Hi there, I'm having a recurring problem with my Fourier transforms that I have tried really hard to figure out but I feel like I'm missing something important. It keeps popping up in my communications and signal processing papers. I keep getting FTs...

Apparently for emf to be induced in a coil, the magnetic field (or part of it) has to act along the normal to the coil face. So does this mean that the coil moves side-ways through the magnetic field? where instead of moving through its length (its longer side), it moves through the coil face...

1. The equation is : y = 50 ( 5 - 0.67 ^ x) 2. Just basic rearranging, I need to isolate x. 3. So far I have.. y = 50 ( 5 - 0.67 ^ x) y - 50=( 5 - 0.67 ^ x) y - 55 = - 0.67 ^ x) Now is the bit where I am stuck, seeing it is raised as a power? I know it's simple, I just can't...

Hey Everyone, If you have an electron with the various energy levels: -14 eV, -30 eV, -52 eV, -80 eV. And that the electron can only move between these levels. How do I go about finding the photo energy that is emitted? Do I just subtract the various levels? Ex. 14 - 30 = -16 etc?

Homework Statement I have a final coming up and I am a bit fuzzy on how to create a matrix that represents a rotation or reflection about a certain plane (in R3). Say we are given a rotation/reflection about either a plane or a line through two points T(v)=Av and we are told to find A. Do we...

1. The problem: In the capacitor circuit shown below C1 = 4␣F, C2 = 12␣F, C3 = 12␣F, and C4 = 3␣F. The switch (S) between A and B is closed and the energy stored in C3 is 1.35x10-3 J. If the switch is now opened calculate the change in the charge on C2. Assume the potential difference between C...

Homework Statement In my book it specifically asks to "find the points of inflection" of f (x) = 2x^3 + 9x^2 - 24x - 10. Homework Equations f (x) = 2x^3 + 9x^2 - 24x - 10 f'(x) = 6x^2 + 18x - 24 f''(x) = 12x + 18. The Attempt at a Solution What I don't get is why it asks for...

Homework Statement A highway goes up a hill, rising at a constant rate of 1.00 m for every 48 m along the road. A truck climbs this hill at constant speed vup = 19 m/s, against a resisting force (friction) f equal to 1/24 of the weight of the truck. Now the truck comes down the same hill...

I've went above and beyond in my philosophy class and wrote an outstanding (at least compared to other students) essay, or in my opinion at least. I had very good sentence structure, coherence and flow, vocab and ideas, good progression of logic, I had original insight into the topic, and...

Well, we really don't need to, but it's nice to have around in case a family emergency requires us to be away from home a bit in the winter. When we bought this place 6 years ago, we bought a tank-full of #2 heating oil. I have supplanted that with 911 fuel-stabilizer a couple of times, and...

I was checking my syllabus to see if my coursebook was missing out on any of the syllabus statements, and it mostly isn't. But for this one statement the explanation in the book isn't good enough and I don't understand what it's trying to say. The chapter is Electric Fields, and the...

Homework Statement The a universal set: u = {1,2,3,4,5,6,7,8,9,10} 1) Find the bit string for b = {4,3,3,5,2,3,3,} 2) Find the bit string for the union of two sets. Homework Equations 1)Would I first begin this problem by realizing that set b is the same as {2,3,4,5}? The...

Hi, i am trying to do a bit shift in systemverilog and compare the bit. For example: i give a input A=011. Then the input will compare with another digital that i have already setup in fsm like 010. Now it will do the compare, 0 to 0---> bitmatch=1 1 to 1 ---> bitmatch=1 1 to 0 ---> bitmatch=0...

Hi, I'm new to Physics Forums and in dire need of your help. Please bear with me, here it goes: Though I'm sure this goes through every person's head who wants to go through University, I really have no good idea of which courses I want to take. I thought maybe computer science would be the...

example 1111 = 15 is there a circuit to separate output binaries 0001(1) and 0101(5) in input 1111(15)?

Hello all, I am new to these forums, and I look forward to plumbing the depths of this interesting site. Anywho, I come to you with a bit of a potentially difficult question. I have always been immensely interested in Astronomy and Physics, and I decided long ago to pursue a career in either...

This really isn't one specific problem per se as it is more of a conceptual issue, so I apologize for breaking away from the given format. I've worked through three problems involving a circuit where a thevenin equivalence circuit is required between two points, and all sources are dependent...

Hey guys, I got an idea in my head to have a bit of fun with a project idea. I want to make one of those claw games that they use to pick up toys, or chocolate bars etc. However there are so many ways to do it. Ideally i would like to make a small c program and put it on a PIC and use that...

Alright, well I am having a difficult time getting these equations to equal out! I keep hitting trouble and have hit a road block. Here is the problem... csc(x)+cot(x) = cot(x)csc(x) tan(x)+sin(x) I am just going to work on the LEFT PART of the equation. 1 + cos(x) sin(x)...

Homework Statement What is the truth table for a 2 bit number multiplied by a 1 bit number? Also, draw the circuit (AKA, the logic gates that give you the truth table). Homework Equations Not really any relavent equations... The Attempt at a Solution so I made the truth table, it...

Hello, Hopefully someone can help me rearrange this equation for x2. The equation is CB = Co e(-x2/4Dt) It is changing the e into a log that is throwing me. Thanks. Seán

Hello You know that the MSB in each byte is always zero in ASCII code (e.g. text file). If I cut the text file by byte, then there will be 0 (which is MSB) that might reveal some information... So, are there any stochastic rules that I make the strings random in ASCII code? It will be...

Dear All, I am looking for the typical surface finish (surface roughness) of a 5 mm hole made by a twist drill bit. Thankssssss GLO

So I began grading my students first lab assignment. It was a 175 question math review going all the way from basic addition to logarithms and basic algebra and they had a week to do it. First person was decent enough. This second person makes me cry. MY STUDENTS CANT DO ARITHMETIC...

Hi, This isn't so much a coursework question, but a 'where to go from here' question. But because I'm not in college, I figured it doesn't really belong in the academic guidance forum. But anyways, on to my question. Currently, I'm finishing up a 5-week precalculus course at a local...

velocity of proton following a helical path?? need a bit of help Homework Statement A proton with an initial velocity given by (4.0 + 3.0 + 3.0)(105 m/s) enters a magnetic field given by (0.62 T). Describe the motion of the proton. The proton will follow a helical path with a velocity of...

I'm going to be a senior in high school next year, and I'm thinking about self-studying AP Statistics. I want to be some sort of mathematician or physicist, and I am thinking that having the equivalent of a first-year course in college statistics will significantly broaden my career choices and...

Hi, I never really understood this. What are the differences between bandwidth and bit rate ? I understand that they describe the same thing, yet are completely different. How are these related?

Hi guys, I have a problem in understanding LTE. LTE is the long term evolution 4G technology. The LTE requirement is 100 Mbps with 1.3, 2.5, 5, 10, 15 and 20 MHz for 128, 256, 512, 1024, 1536 and 2048 subcarriers. Each bandwidth corresponds to each number of subcarriers. My problem here...

I haven't been on PF in quite a while now and after reading through some of the threads in the Astronomy and Computing sections, I feel as though I've been missing out, er, a bit guilty. I was out on a couple of deployments for quite some time (got to see some beautiful countries), and finally...

I am a bit confused at "orthonormal tetrad" in General Relativity... I think orthonormal tetrad should be a set of vectors like [FONT="Georgia"]e0= (1,0,0,0) e1= (0,1,0,0) e2= (0,0,1,0) e3= (0,0,0,1) However, in my book, it is written as [FONT="Georgia"]e0= (-1,0,0,0) e1=...

Hi I'm having trouble with coming up with a minimal solution to this problem: create a 8 bit adder/sub using only one 4 bit ripple carry adder and muxes. This is what I'm thinking but I don't know how to make it any bit simpler: We can calculate the sum of first 4 bits using the ripple carry...

Can anyone please explain me what's 128-bit and 256-bit encryption in layman's word (but bit in detail please). (I am a mechanical Engg. and have least knowledge on security aspects of IT). Thnx.

I thought to write a naive simulation of an inflated ball, I am not sure how to implement this by Vpython. I mean I want to see it gradually inflating minute by minute. This is the code I wrote but I don't know how to add to it a timer. from visual import *...

I'm confused about the sum of the geometric series: \sum ar^{n-1} = \frac{a}{1-r} when |r|<1 but if you have a series like: \sum (1/4)^{n-1} the sum is: \frac{1/4}{1-(1/4)} should't it be \frac{1}{1-(1/4)} because there is no a value?

1. Use the method of Lagrange multipliers to nd the minimum value of the function: f(x,y,z) = xy + 2xz + 2yz subject to the constraint xyz = 32. I understand the method how Lagranges Multipliers is donw done but seem to have got stuck solving the Simultaneous Equations involving the...

i need to work out the integral on a complex curve: i am just stuck with the integral: int[0,2pi]((ie^it)/(e^it +1+i))dt ps. how do you insert latex text? thank you!

Homework Statement what is the kinetic energy of a 3000lb car traveling at a 60mph (pounds are not units of mass) Homework Equations KE=1/2* mass * velocity ^2 The Attempt at a Solution pounds are the units of force but to calculate the mass I am missing some data unless I'm...

I'm in the penultimate year of my MPhys degree and I am on track to get a 2.1 I am good friends with the people in the year above me and speaking to them has made me feel a little lost re: careers. Medical physics is something that really interests me, and something I was planning on...

I have been reading about the multiverse idea recently and when I came to think of it , as much as I find it extremely interesting, isn't it a bit discouraging as well? I mean, if there was "time" before the big bang and if there are infinite number of other "bubble" universes in the "11th...

In general, if I have a constellation of symbols, how can i calculate the energy por bit? I think I should calculate the area of figure which is formed linking external points in the space signal and divide it for the numer of bit compose the symbols. Right?

Hi guys, after using the forum for ages for help I decided to make an account, so hopefully I might be able to contribute something as well, who knows :) I'm a first timer with MATLAB and have been set an assignment. I'm completely stuck on question one: The following image shows my code and...

Hello, my problem is that I could not be able to find to separate the roots with the command of FindRoot. Altough I have 2 non-linear equations, I can solve these with FindRooot, but I'd like to have separetely the roots I mean independent roots each other (x apart and y apart). I wonder if i...

Homework Statement Suppose a computer has 8-bit words. How many different integers can be represented (in decimal) in a single word if the integers are represented in binary coded decimal(BCD)? Homework Equations BCD= Binary Coded DecimalThe Attempt at a Solution BCD is coded in 4 bits so...