What is Pdf: Definition and 345 Discussions

Portable Document Format (PDF), standardized as ISO 32000, is a file format developed by Adobe in 1993 to present documents, including text formatting and images, in a manner independent of application software, hardware, and operating systems. Based on the PostScript language, each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, vector graphics, raster images and other information needed to display it.
PDF was standardized as ISO 32000 in 2008. The last edition as ISO 32000-2:2020 was published in December 2020.
PDF files may contain a variety of content besides flat text and graphics including logical structuring elements, interactive elements such as annotations and form-fields, layers, rich media (including video content), and three-dimensional objects using U3D or PRC, and various other data formats. The PDF specification also provides for encryption and digital signatures, file attachments, and metadata to enable workflows requiring these features.

View More On Wikipedia.org
Recent contents Top users
  1. H

    Opening PDF Files in Bash Shell on Macs

    how do i open a PDF file in the bash shell on a mac?
  2. L

    A question about a joint pdf and how to work out probabilities?

    Homework Statement Let X1, X2, X3,...Xn be independent and indentically distributed with pdf f_X(x)= 4x^3 for 0 < x < 1 First I had to calculate the joint pdf of distribution of X1, X2, X3..Xn which I did I got 4(X1*X2*X3*...*Xn)^3 Which I'm hoping is correct. a) determine the...
  3. M

    Estimating & Plotting PDF & CDF of Random Variable X in MATLAB

    halw could anyone help me in writing this project in MATLAB ?? A random variable X is observed at certain experiment. 100,000 samples of this random variable are stored in a vector called samples. 1. Use MATLAB to read the samples of this random variable. To read these samples you...
  4. T

    Can I flatten a pdf in Acrobat?

    Can I "flatten" a pdf in Acrobat? In Adobe Acrobat you've got some drawing and markup tools. When using these, what happens is that whatever you draw is placed "on top" of the pdf. Also, when you print you need to specify that drawings/markups are to be included. Otherwise they're just ignored...
  5. N

    Getting images out of PDF files?

    I'm doing a presentation for coursework, and would like to include some figures which are in other papers (on my computer in PDF format). What is the best way to get one of these images and include it in my document (latex)? I can just select it and copy/paste to an image file, but is there a...
  6. W

    Minimum conditions for defining joint PDF

    Suppose one knows a probability density p(x) over a space X (where x\in X) and a conditional probability density p(y|x) over a space Y (where y\in Y). This implies the integral \int{p(x)dx} is well defined as well as \int{p(y|x)dy}. Defining a joint probability density p(x,y)\ =\ p(y|x)p(x)...
  7. M

    Good PDF on Networks: Internet Protocols & Encapsulation

    I am supposed to be sleeping but I re-woke up realising there was something I wanted to do today that I forgot. I'm sending you a pdf that you can use as posters, it is about internet protocols and their encapsulations. I hope you'll like them (now I go sleep). I have other cool stuff like these...
  8. J

    Does Alan Hatcher's Topology book Work on 'Experimental' PDF Readers?

    Does anyone here have one of these book readers? I want to know how good the 'experimental' PDF support is. For instance, will it display Alan Hatcher's Topology book?
  9. P

    Software to Convert Scanned PDF to Editable Text

    Can anybody tell me the software name which changes a pdf file(text mode) which has been scanned and kept in pdf format actually i want to modify the data in that image ie one textbook has been scanned and that is put in pdf format I changed it into word with the converters(pdf to...
  10. E

    Finding Joint PDF of Two Exponential Random Variables

    Can anyone tell me how to find the joint PDF of two random variables? I can't seem to find an explanation anywhere. I'm trying to solve a problem but I'm not sure where to go with it: Y is an exponential random variable with parameter \lambda=4. X is also an exponential random variable and...
  11. K

    Are There Any PDFs on Lagrangian Dynamics with Problems and Solutions?

    Is there any pdf about Lagrangian Dynamics include problem and solution. Thanks...
  12. S

    Find cdf, pdf and expextation value of a random variable

    Homework Statement Let X represent the random choice of a real number on the interval [-1,1] which has a uniform distribution such that the probability density function isf_{X}(x)=\frac{1}{2} when -1\leqx\leq1. Let Y=X^{2} a. Find the cumulative distribution F_{Y}(y) b. the density function...
  13. M

    View PDF files in different browsers

    Hi all, Any one can help me how to configure the Acrobat Reader so that we can view PDF files in different browsers? For example, we have two datasheets saved in pdf format, and we want to open to compare their specs. Thanks for any help! Mike
  14. D

    Creating PDF Documents with Math Symbols on a Budget?

    Homework Statement How do I create a PDF document with math symbols in it without spending a lot of money. Homework Equations The limit of my spending tends to zero. The Attempt at a Solution Should I just get acrobat and use the program I already own (rapid-pi) which helps to...
  15. P

    The kurtosis of standard normal pdf

    Hi, I'm tying to solve the fourth moment of pdf of standard normal pdf. meanwhile, i have to break this one: how to get the result of integral of x exp (x) dx. that would mean a great difference to me. thank you.
  16. N

    Mathematica Attach my mathematica notebook to the pdf

    Now if I want to attach my mathematica notebook to the pdf what would I have to enter in LaTeX?
  17. X

    Histogram of Sinusoid: Is it the Same as PDF?

    I am looking at values of a sinusoid, y = A sin(2*Pi*f*t), oscillating between A and -A at a frequency of 25 Hz over 0.650 milliseconds. If I find the histogram of the sinusoid, is this the same thing as the probability density function of that sinusoid? If this is not the case, what does...
  18. J

    Finding the pdf from generating functions?

    finding the pdf from generating functions?? The generating function of a Poisson distribution is given by f(z) = Exp[-lamda(1-z)], where lambda is the mean and variance of the poisson process. Now suppose I have an embedded Poisson process, that is, f(f(z)), the new generating function...
  19. S

    Time invarient pdf but nonstationary process

    I am wondering if there exist some solution to the general stochastic differential equation (SDE) such that I get a time independent pdf(x) while the stochastic process Xt is nonstationary.. I really need some help with that..
  20. DaveC426913

    Online PDF conversion service - fishy?

    I've been asked for my opinion on online PDF conversion sites. This is what I was sent: http://www.pdfonline.com/index.htm#free" My spidey-sense is tingling. I just wonder what they're getting out of it that they're not telling me. Can anyone advise me about online PDF converiosn in...
  21. B

    PDF example of mechanical structure?

    Where can I find a good course (maybe in pdf) that give me a lot of example of mechanical structure? Statical, dynamical? Thanks.
  22. M

    How to find pdf given moment generating function

    Given that the moment generating function of a random variable is (e^t)/(2-e^t) is there a way I can go backwards and find the pdf, or could 2 different pdf's have the same mgf?
  23. S

    Pdf of the sum of two distributions

    I'm not too sure where to post this so feel free to move it :) Anyway I'm hoping someone could explain the answer of this problem to me (I would ask my lecturer but he's conveniently away for the week for a meeting). Suppose X and Y are iid continuous random variables with density f...
  24. benorin

    Mathematica Handbook of Mathematical Functions: Free Online PDF

    Though some of you would benefit from this, an online PDF version of Handbook of Mathematical Functions by Abramowitz and Stegun can be found here: http://www.math.sfu.ca/~cbm/aands/dl/Abramowitz&Stegun.pdf [The URL is http://www.math.sfu.ca/~cbm/aands/dl/Abramowitz&Stegun.pdf .]...
  25. S

    Find the Probability of Joint PDF X and Y with Easy Calculation

    Given this joint PDF of X and Y: X\Y 1 2 0 0.1 0.3 1 0.05 0.1 2 0.2 0.25 So: P(X = 1| X+Y=2) = 1/2? P(X <= 1 and Y <= 2) = 1/3?
  26. T

    Computer Engineering Logic Circuits Notes

    does anybody has notes about logic circuit for computer engineering??or any website recommended pls... pls help... thank you...
  27. C

    Universe Today PDF: Interested in Astronomy?

    I thought this might be of interest to some of you astronomy people.
  28. C

    Creating Table of contents in PDF

    I was wondering.. How can you modify a PF file to have the TOC organization in the drawer rather than the flat page preview? Some PDFs of large documents have an organization that separates the PDF into sections and when you select that element or an element from the tree below an element, it...
  29. J

    Finding PDF of Y from Uniform Distribution of X1-Xn

    Suppose X1, . . . ,Xn are independently and identically from the uniform distribution on [0, 1]. Find the probability density function of Y = min[X1, X2, ... , Xn]. I do not know how to formulate this problem. I know that the pdf has to be some integral, but no clue so far.
  30. L

    Need gauss like PDF with skewness

    need "gauss like" PDF with skewness I am looking for a Probability Density Function that has the following properties: is defined on R like the gaussian has a non null (and non constant) skewness that is controlled by a parameter degenerates towards the gaussian At the moment I am...
  31. A

    PDF file that gives a good introduction to congruencies?

    Does anyone know a good website, or have a PDF file that gives a good introduction to congruencies? I can't seem to find one on the internet. Thanks for your help.
  32. R

    Anyone have a pdf of Maxwell's EQs in quaternions

    Just curious. You can do a lot of stuff with quaternions that you can't in vectors.
  33. N

    Where can I find PDF Black holes White Dwars and Neutron Stars

    Where can I find PDF "Black holes White Dwars and Neutron Stars" Gents, Could u pls advise me if you know where can i find book "Black holes White Dwars and Neutron Stars" Authors Shapiro, Tuekolsky (free PDF or DJVu or other format) Thks
  34. S

    Make a Pdf file into an ordinary web file (html file)?

    I have a hard time reading pdf files and i can not stand this file type. it is so slow and give me sickness and headache. :cry: It crushes me that the manufacturers are very fond of this file type :grumpy: . How can i make a pdf file into an ordinary web file which is very easier to read...
  35. C

    PS to PDF Conversion: Find Software for All Languages

    Does anyone know of a good software that can make this conversion? It needs to support all languages, since most of my documents will be in Hebrew. Thanks, Chen
  36. S

    Find c for Joint PDF fX,Y(x,y)

    so X and Y have joing pdf f X Y(x, y) = 1/2 for 0 < y < x < 2, and 0 otherwise. find P(0< Y < 2/5 | X = 3/4) first, I don't understand how to read the function. So the function is equal to 1/2 when 0 < y < x < 2. And it is equal 0 otherwise. So I need to find Probabilty Y is between 0...
  37. quasar987

    LaTeX How to create PDF documents and write in LaTex?

    What do I need to do to be able to create PDF documents and be able to write in LaTex in them like on this forum? Thanks.
  38. N

    THe Laplace random variable has a PDF that is a double exponential

    THe Laplace random variable has a PDF that is a double exponential, fT(t)=ae^(-|t|/2) for all values of t and a, a constant to be determined. A) Find a (Answer 1/4) B)Find the expected value of T, given T is greater than or equal to -1. (Answer 1.31)
  39. S

    Having trouble w/ understanding pdf

    so I"m trying to understand pdf, the one where the formula is ((rCk) * (wCn-k))/(NCn). Here, xCx means x chooses x. anyways, N is the total, and n is how much you sample out of it. and we know that r + w = N. what is k? I know this is diffenrent for all problems, but is there an...
  40. Clausius2

    Space Shuttle Reference Manual PDF Download

    Anybody knows where can I download the Space Shuttle Reference Manual in PDF version?. Any helps welcomed.
  41. P

    Efficiently Convert MS Word to PDF: Tips and Tricks for File Size Optimization

    I have an MS Word document which is about 80 pages long and 800k large. I had a friend convert it to a PDF for me but it came out to be over 6M large. Is that size to be expected? If not then how do I convert this to a PDF file corrrectly? Thanks Pete
  42. quantumdude

    Creating PDF Files from Other Formats

    What is the easiest way to make PDF's from HTML or DOC files?
  43. M

    Need a quick reference for math? Check out this PDF!

    I made a math reference PDF... I was feeling in the generous mood and made a PDF containing basic integrals and trig identities and such, this way one doesn't have to keep flipping back to the flap of the book to check something :) http://praetersoftware.com/mathref/
  44. wolram

    Download a pdf file it regulaly freezes

    hi. when i try to download a pdf file it regulaly freezes, it seems my computer is sending information but not receiving, is it my computer, i use acrobat and win XP, or the severs fault? hope you can help as this getting to be annoying.
  45. enigma

    Print 2-4 Pages per Sheet with PDF & Win 98

    Perhaps someone can help me out here. For one of my classes, the professor has made available the lecture notes in .pdf format. I would like to print them out prior to class so I can actually spend time absorbing information instead of frantically scribbling. However, I don't want to print...
Back
Top