Troubleshooting Definition and 332 Threads

Does anyone know how to use Sweave in R? I read a tutorial it said make a texfile with extention .Rnw instead of tex f.ex myfile.Rnw and use the command sweave('myfile.Rnw') in R. But by R has no such function even though the tutorial says it has. Tutorial...

So I have the piezo lighter hooked up to a rheostat with one mega ohm resistance, then a 30 kilo ohm resistor and then another resistor of 1 mega ohm. I have an oscilloscope- it's really old though. It's max voltage if you set the axis on the bottom of the screen is about 80 Volts. It's hard to...

hi there, how can i show that the lie brocket is not connection? Many thanks =)))

Sorry, the template didn't really work for those questions. 1.) Which of these sentences are propositions? What are their truth values? a)Boston is the capital of Massachusetts. -> Proposition, but what do they mean by truth values? F and T? Then it would be T. b) Miami is the capital...

Hello to everyone :) Since I did not notice a presentation section I put some info about myself before the question,. My name is Enrico, I am Italian (form Modena) and I am 18. I am studying Electronics&Telecommunications in High School and I have applied for UCSD/UCLA/Berkeley (I hope they...

Okay, so I'm trying to connect my TI-89 to my computer (I run windows 7 by the way) so I can put notefolio files on the calculator. I have the CD and usb that comes with the calculator, and used those to connect to the computer and download the TI connect software. This is where the...

1. The problem and attempt statement, all variables and given/known data [PLAIN]http://img31.imageshack.us/img31/2530/lastscanph.jpg I have been at this problem for a while and i can't seem to find where i am going wrong, can someone please take a look at it. thank you for your time.

Hey guys, I was just wondering what is an error during a lab? I always get these parts wrong on my lab, mainly because I don't know of any errors that are occurring in a lab. For my lab I was using a ballistics pendulum and sometimes the rod wouldn't pull back right or shoot right. Would that...

I know this isn't really general math but here goes, I need to insert an image into my text on latex, when I put this; \begin{figure} \begin{center} \includegraphics[scale=0.7]{CantBeamPointLoad} \end{center} \caption{A cantilever beam with a point load P at the end of the beam}...

Hello. I have developped a transimpedance amp using LF356, unfortunately I get an oscillation at 500 kHz of low level (10 mV) but not acceptable. I've tried all classic tricks, decoupling power supplies ... With no real improvement and so I'm going to developped a similar amp using discrete...

Hello, I am trying to do some EEG analyses and I am having trouble converting biopac files (.acq) to an acceptable file type for EEGLAB. I tried converting to both MATLAB (.mat) files and text (.txt) files but neither have worked. It seems like EEGLAB is primarily for Neuroscan, but I do not...

my program is not working properly after taking values it gets overflow #include<stdio.h> #include<conio.h> void insert(struct node**, int); struct node *ptr; struct node { int data; struct node *right; struct node *left; }; void main() { int will , i , num; ptr = NULL...

Need help with the file attatched. thanks.

Hi guys I have produced an ingot of NiTiHf alloy through Vacuum Induction Melting (VIM) process and by using pure materials of Ni, Ti and Hf. Casting was done in a Y2O3-coated steel mold, and the crucible was made of graphite. The problem is that, when I homogenize the ingot at 1000 oC and...

Hi everyone, I am running agarose gels (1.5%, 100 V, 100 min) with the product of PCR-RFLP. My gel has 96 wells...48 on top and 48 on the bottom, so it is a rather large gel...300 ml by volume. I am having trouble getting clear, bright bands for the DNA in the lanes near the edges. It...

I'm not sure if this is the right place for this question, but I didn't see a forum specifically about software. I'm trying to define a function in MathCAD that describes the rotation of a body vector about an axis u by an angle ɸ. What I've typed in is: R(ɸ,u):= [ 3x3 matrix where each...

It's an object that's falling from rest. The equation takes into account linear friction. in any case, this is is my code or program of whatever it is called: m=80;%Mass of ignorance g=9.8;%Gravity beta=1.6*10^-4;%Given coefficient for air at STP D=.4;%Diameter of Palin, assuming she's a...

Tell me why am i not able to compile this program, the terminal lists various errors http://tinypic.com/r/1zxtm5h/7

I bought a red <5mW laser from thinkgeek.com, and it takes 2 AAA batteries. I took it apart though, took off the momentary pushbutton switch and soldered in a wire because i need to solder on a constant on/off switch at some point but I have noticed the laser is not acting how it was before...

can someone tell me what is wrong with my code? i am trying to make a code that has 1000000 randomly choosing A or B 1000 times. if A is bigger than B, i want to increment the variable called 'aWins'... when i try to get it to print the screen is blank. i left out the int main and #include parts...

Hi! For long time I have doubt about shipping.This is an option in most telivisons' MFG menus.. When I was repairing my hyundai TV remote.I just pressed down a key on board which was not given on case of remote.The whole colour was changed reddish.I then went deep in the options colour...

I just installed Norton AntiVirus Corporate Edition, but when I go to download the updates, he says he is already running. Can anyone help me with this problem? Why is it already running when I have done nothing yet ... and it will not be updated. It scans ok but no update. Help!

Hi all, After about 15 weeks of no use (set theory course this term), my TI-89 is now completely unresponsive to any input. I have tried removing the batteries, holding down [left] + [right] + [2nd] + [on], and [-] + [)] while reinstalling one battery as indicated in the owner's manual. I...

I have been creating simple programs from the hello world one to simple math and loops - all of a sudden when I went to practice more today my programs would be completed but the window showing the result would pop up and almost instantaneously close itself - in the end I can't see the result...

I just had my outboard serviced end of last season. When I got it a year ago, it would tend to start up on first pull. Here's what I want to understand: It will not run below medium-high speed. If I go one degree below medium, the motor will slow and eventually stall. At the same time, at...

I am trying to post a question in the physics section but the LATEX is misbehaving. It seems to be stuck on the equation for kinetic energy. Any LATEX command I put in always shows up as the kinetic energy equation. Any ideas on how to fix this? I have closed the web browser and opened it up...

I hope you can help me with this problem. A few days ago, I began a post with a LaTex equation in it, but never completed the post (I got the answer I needed). I'm trying a new post today, and no matter how or what I enter as LaTex, when I preview the post I see the equation I tried to use a...

I have been pulling my hair out on this one. I have a double** that is a private member of a class. The constructor declares and initializes it as a 2 dimensional dynamic array of doubles (an array of arrays). Then it sets every element of the array equal to 0 with a set of two nested for...

I want to talk about video drivers. When I go to my device manager I have no 'known' video drivers. There is a tab that is titled 'Other devices'. When I click on it, there is a driver titled "Video Controller (VGA Compatible)". The manufacturer is unknown and I cannot install any software to...

. I tried making a newman motor according to a video on youtube. I have copper wires coiled around a plastic pipe, 200 above and 200 coils below the middle of the plastic pipe. The shaft in between is made of iron and it is quite thick. Now when I connect a 9v battery to the two ends of the...

What is wrong with my proof? Let \theta=cos^{-1}x-\frac{\pi}{2} Then cos\theta=cos\left(cos^{-1}x-\frac{\pi}{2}\right) RHS=xcos\frac{\pi}{2}-sin(cos^{-1}x)sin\frac{\pi}{2} =-\sqrt{1-x^2} Therefore \theta=cos^{-1}(-\sqrt{1-x^2}) \theta=\pi-cos^{-1}\sqrt{1-x^2} Hence...

I've recently started trying to use this technique, but I've had some difficulties I can't figure out how to overcome. We make our own probe tips from a very small length of 30 gauge wire, and they seem to be of decent quality. We've tried to image a layer of graphite, a gold surface...

Hey all. I am building an IR modulator but seem to have a small kink in the design. Here is my schematic: Here is a picture of the oscilloscope, connected between ground and the output of the TL555 timer and the output of the second transistor (the output pulse going into the LED's)...

Hi there, I'm having some issues with logic functions in matlab. I don't use them very much so I'm not too familiar. What I'm trying to do is create an 'm' file for a physics project and I would like a certain progression. I'm trying to create some 'if' statements to do this. So first of all I...

Needed some guidance for my circuit: Have a circuit consisting of a microcontroller + SSR relay + load (heaters)...issue is when the temperature reaches cutoff the heaters are not getting stopped and temp. keeps on increasing... I have a connection of outputs from microcontroller into...

hi, could some one please explain where i am wrong? A mass M of 5.80E-1 kg slides inside a hoop of radius R=1.50 m with negligible friction. When M is at the top, it has a speed of 4.43 m/s. Calculate the size of the force with which the M pushes on the hoop when M is at an angle of 46.0°...

HI! I am actually working on a project involving Acoustic Modem. However, we met up with some problems. We actually took the acoustic modem from another item. Thus there might have been some programming done to the modem which we do not know. The acoustic modem will work when its...

Dear Experts,o:) I have recently soldered some diodes to maintain a constant voltage. This i learned from this nice forum. But when using it, the diode can become quite warm. My doubt is, when diodes become warm to touch, like about 60 degrees celsius , is it something wrong with the...

Hi, Can anyone help me check the circuit and if possible tell me what could be the problems? At 12V supply,the circuit works fine and I am getting approx 60mA with resistance 100 ohms. Now I wanted to increase the current by reducing the resistance to 50 ohms.And I got 115mA. Since...

My task is to draw a square on black background using ppm. What I did is this loop: for (int h=0; h<=480; h++){ for (int w=0; w<=640; w++){ if (h>100 && h<380 && w<460){ //green paint fprintf (fp, "%s", greenColor); fprintf (fp, "%s", space); } else {...

Hello, I have the following Mathematica code warnings: NIntegrate::slwcon: Numerical integration converging too slowly; \ suspect one of the following: singularity, value of the integration \ is 0, highly oscillatory integrand, or WorkingPrecision too small. >> NIntegrate::inumri: The...

[b]1. Homework Statement [http://img44.imageshack.us/img44/1104/58339946.jpg ][/URL] [b]2. Homework Equations [F=k*abs(q1)*abs(q2)/r^2] [b]3. I understand the equation, but I am having trouble with my signs and also how to include the distance in the equation. I know that the...

I put LED LIGHTS 60 WATTS on an off road vehicle with a stator not an alternator. When i use my winch or the cooling fan comes on the light goes out. I can turn the light switch off then on and it comes back on. It only happens when there is a fairly heavy draw on the system. Can this be fixed...

I'm having problems filtering out certain frequencies from others with a series LC filter. I have a 1.923 Henry DC filter choke inductor set in series with a 0.1 micro Farad capacitor. I send the signal through the inductor to the capacitor and output from the other side of the capacitor. I'm...

Could someone who understands the complexities of this site look into my blog posting "LateX Trial - Nothing Interesting here", examine the displayed equation then click on it to display the LateX code? When I do this, the displayed equation does not match the code. Is it me? And if it is...

Hello. I need some help. I've realized a circuit in which I sample extremely low currents (<100 pA) using charge transfer to a 3.3pF cap, through a low leak FET (2N4117 reverse gate current about 1 pA). The problem : Instead of progressively charging the cap, this one seems to be charged and...

Hi, guys. Did you ever encounter the problem of X-ray disappearing caused by size effect?

So I'm trying to do a question in Maple and I'm beyond lost. I've used it before but a different version and Maple 12 is confusing as is the syntax. Anyways, the question is: In one ty-graph plot the solutions of y' = cos(pi*ty) for a sequence of 21 equally distributed initial points y(0)...

Homework Statement A weather balloon is designed to expand to a maximum radius of 30 m when in flight at its working altitude where the air pressure is 0.033 atm and the temperature is 95 K. If the balloon is filled at atmospheric pres- sure and 462 K, what is its radius at lift-off...

I am transmitting an electromagnetic field from a loop antenna of 0.28 radius to one with 0.216 radius. I know the antenna factor of the receiving antenna but when I add it to the measured field strength, it does not equal my calculated transmit field strength. Should the shorter antenna be...