Today, AutoCAD continues to evolve and is an industry leader in 2D and 3D CAD software. One of the tools AutoCAD includes is a drawing editor, allowing users to create, modify, and manage 2D and 3D drawings. Users may add and modify objects to a drawing, select and place paths, create dynamic text and equations, as well as specify views, groups, and symbols to easily label and find objects. Like other CAD programs, AutoCAD includes a 2D drafting editor for drafting, 3D modeling, and geometric conversion.

AutoCAD was originally developed in the early 1980s by Bill Siemering, Don Johnson, and Dennis Prakapas at Computer Associates in San Jose, California. In 1982 they founded Autodesk, Inc. and AutoCAD was released as a desktop app for PCs running the MS-DOS and Microsoft Windows operating systems. AutoCAD was the first desktop CAD application to run on Microsoft Windows. (Earlier products included dBase and MicroCAD, which were DOS-based.)

History

At its initial launch, AutoCAD allowed users to create drawings using a right-click and the drawing tools available in the main menu. In 1982, AutoCAD was only available on computers with the View Master II graphics adapter. Version 1.0 was released in December 1982 and included the following features:

Two drawing modes: Flip-Flop (standard) and Reverse Flip-Flop (and Reverse)

Drawing tools: Line, Arc, Rectangle, Polyline, Polygon, Circle, ellipse, and Text

Shape Style: Solid, Rounded, Rectangular, Hinged, beveled, and filled

Drawing text using a limited set of fonts

Drawing a series of dashes and dots using a curve tool

Drawing arrows and lines using a set of predefined geometric shapes

The drawing editor also included the following tools:

Arrowheads were basic 2D polyline tools that had only 2 arrowhead types: vertical and horizontal. Later, they were added to the list of drawing tools.

Polylines

Polylines were basic 2D line tools that had only 2 line types: open and closed. Later, they were added to the list of drawing tools.

Chains

Polylines and lines could

Structure elements
The element of AutoCAD is a generic term for objects in the program. The term is also used for the more specific feature of model or drawing elements which can be found, for example, in the Object tree or in a table.

A generic model element is what you get when you select an object in the drawing. If you have a drawing with objects such as Axes, Cylinders, Screws, Plates, and Texts, you will have the entire drawing selected, when you press the Enter key on a command line (or select Tools > Generate> Model from the menu bar).

A specific model element is an object from a collection of objects which can be found in a tree in the model document. Once you have selected the element you can enter the properties of the element.

Object attributes can be applied in a generic manner to a whole drawing or to a specific model element. An attribute can be generic, such as a color, or specific, such as a thickness.

Generic
A generic attribute can be applied to a model element or to a whole drawing.

Specific
A specific attribute can only be applied to a specific model element or to a specific drawing.

Examples

The following examples show how you can use objects, attributes, elements and settings.

Create a new drawing

Open a drawing (with a model) and create a new drawing.

This will create a new empty drawing.

Switch to the Model Tree (CTRL + T)

Select the new drawing and use the cursor keys to place the drawing in the current page.

You will find the drawing in the model tree. It is called Project Schematic. The drawing is in the active page.

Insert a new drawing object

Create a new drawing by pressing the File > New command.

Add an object to the drawing

Click anywhere on the screen.

The drawing will be automatically selected.

You can click any of the command line icons to draw, to create an object or to enter the properties for the object.

Create a new element

Press Ctrl + T and select a model element.

You can also select an object by dragging it.

Note: This feature is unique to AutoCAD.

You can also use the keyboard to select an object.

Enter a new property value
3813325f96

Open the Autocad software and select the Python scripting assistant, then double-click on AutoCAD.

Click on “Get Script From Clipboard”.

Click on “Paste”.

Save the script on a directory and save it with an extension like *.py, open your Notepad and replace the variables with your own.

For instance:

width=20.0, height=20.0,
depth=10.0,
pixels=50

If you want to export the curve as a polyline, go to “save as”, select “arc/polyline” and save the script as.dat or.poly file.

Open this.dat file with a text editor and replace “width=20.0” with “Path width=20.0” and save it.

Now double-click on “load” and select your.poly file.

Q:

Probability that the sum of $n$ uniformly chosen random variables is odd

Let $X_1,X_2,\ldots,X_n$ be independent, identically distributed, random variables, uniformly distributed on $\{ -1,+1\}$. What is the probability that the sum $X_1+\cdots+X_n$ is odd?

This was a question in my probabilty class, but I can’t think of a way to solve it.
I thought of saying that because $\mathbb{P}(X_1+\cdots+X_n=k)=\frac{1}{4^n}$ for $k=0,1,2,3$, the probability is $\frac{3}{4^n}$.
But I think this is wrong, as I don’t think that we should need the independence of the random variables to get that.

A:

$\{X_1, X_2, \dots, X_n\}$ are i.i.d. Bernoulli($\frac{1}{2}$). Then,
P\left(\sum_{i=1}^n X

## What’s New in the AutoCAD?

Use the Printout command to send a PDF or image to the printer. If you use a prepress application like Adobe Illustrator or Photoshop, you can print out a PDF that includes your annotations. AutoCAD and Autodesk Design Review can import the files.

Support for PCX and BMP file formats is now included, to import raster and vector images from other software.

Support for several new file formats, including a new texture map format (.tex) and a.ztd fileset format that lets you save a set of parameter values for a block.

Drag and drop the AxieRuler to a.ZD,.rdf,.dxf,.trn,.txt,.log, or.gdf file. Add a mark or arc to a drawing with just one click.

Introduces AutoCAD’s 2D Profile and 3D Profile commands to quickly edit or create drawing profiles.

With the Profile command, you can quickly open the Design center and quickly open the current profile.

3D profiles make it easy to open a 2D drawing and set the default settings in 3D.

You can customize the Profile command to open the Design center quickly.

New drawing commands to add markers, lines, arcs, and dimensions to the current drawing or selected drawing.

Use the EXPORT command to send a design to the 2D-plotter or laser-cutter.

Import AutoCAD PostScript (.eps) and PDF (.pdf) drawings from a design center document or an external source.

Use the Print command to print a PDF or send a file to a prepress application.

Use the Edit command to edit a preprocessed 2D plot with the graphic editing tools.

Integrate and manage.pcd files and.ppt files.

Support for.ptc files from Inventor/PTC Creo.

View and edit drawing annotations and add annotations in a drawing in a new tab on the Annotations tab.

Set the annotations color to match the paper color.

See and edit the parametric properties of drawing blocks (parametric or nonparametric). You can also add your own blocks in drawings.

Use the WYSIWYG (what you see is what you get) Annotation Wizard

## System Requirements:

Mac: OS X 10.7.2 or later