Introduction

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AutoCAD is a commercial and professional software package that is used to create, edit, and analyze 2D and 3D models. The software has the capability to view and document 3D models in the context of surrounding drawings.

Users may interact with AutoCAD through a graphic user interface (GUI) that includes the display of a 3D model, commonly called the model window. Additional information, including views and functions that can be displayed on the model window, are typically provided on a separate status bar.

An AutoCAD drawing or model can be viewed and edited in 3D space on the model window, and measurements can be made directly from the model window. Typically, 2D drawings or plans are used to document the 3D model. Some AutoCAD functions may also be accessed through a command line. The command line is a text-based interface that is used for entry of commands.

Many of the drawing functions of AutoCAD are performed through the command line, and some are not. For example, in AutoCAD LT, a drawing can be created in a model window, then saved as a 2D drawing, and the 2D drawing can then be loaded and displayed in the model window. AutoCAD LT drawings are not saved in a 3D format.

The primary interface used by AutoCAD is a GUI called the ribbon interface. The ribbon interface is the best-known and most-used interface, and it also presents the most common commands. In addition, a ribbon interface can be displayed on screen, while a more traditional user interface can be used in design environments.

Typical features of the ribbon interface include the ability to save or open files and to import other files. Several primary functions are available through the ribbon interface, including

In May 2016, the Autodesk Exchange App Store opened with more than 40 products. In October 2019 Autodesk Exchange Apps add-on was closed down by Autodesk.

Raster-based data formats
Autodesk’s AutoCAD offers support for five raster-based data formats.

Vector-based data formats
AutoCAD LT – Supports drafting, plotting, surface, polyline, path, line, polyline, straight, arc, arc segment, rectangles, ellipses, circles, free-hand drawing, splines, and multi-line text. It supports DWG, DXF, DWG, DGN and PDF.
AutoCAD Architecture – Supports drafting, plotting, surface, polyline, path, line, polyline, straight, arc, arc segment, rectangles, ellipses, circles, free-hand drawing, splines, and multi-line text. It supports both the DGN and PDF file formats.
AutoCAD Civil 3D – Supports drafting, plotting, surface, polyline, path, line, polyline, straight, arc, arc segment, rectangles, ellipses, circles, free-hand drawing, splines, and multi-line text. It supports both the DWG and DXF file formats.
AutoCAD Electrical – Supports drafting, plotting, surface, polyline, path, line, polyline, straight, arc, arc segment, rectangles, ellipses, circles, free-hand drawing, splines, and multi-line text. It supports both the DWG and DXF file formats.
AutoCAD Graphics – Supports drafting, plotting, surface, polyline, path, line, polyline, straight, arc, arc segment, rectangles, ellipses, circles, free-hand drawing, splines, and multi-line text. It supports both the DGN and PDF file formats.

AutoCAD does not support any vector-based data formats natively. There are however a number of AutoCAD add-on products, such as Autodesk Inventor, that can read and write vector-based formats like DGN, DXF and DWG.

For the AutoCAD LT, DWG, DGN, and DXF data formats, see Data,
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\sup_{x\in (0,\pi)} \frac{|w_x(x)|}{x} \leq \sup_{z\in (0,1)} \frac{|w_z(z)|}{z} \leq 1.$$Now, we can apply the maximum principle for first-order quasi-linear equations [@C], which gives that$$\label{boundv}
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## What’s New In?

One of the most important new features in AutoCAD 2023 is the ability to work in color, using either fill or shading. In previous releases of AutoCAD, you could shade with solid fill, but color itself was a fixed attribute. Now, AutoCAD gives you the option to work in color.

Create color based on a fill or pattern:

With Pattern Assistant, create color by applying a pattern, instead of using fill or shading. It’s a powerful way to quickly and easily establish color assignments. (video: 1:15 min.)

With a series of simple steps, change any shape in a drawing to any color or pattern available. Create a quick color assignment for a particular edge of a face, using Pattern Assistant, or create a color fill or gradient that applies to the entire face of the object. (video: 1:15 min.)

Map colors and patterns to the layer of a multi-layer drawing:

In previous releases, only the color of a layer could be assigned to a shape in a multi-layer drawing. Now you can color layers, patterns and fills in any way you want. (video: 1:15 min.)

Approach & Go Lines, Polyline Blocks, and QuickArrows:

New features in AutoCAD 2023 include Approach and Go Lines, Polyline Blocks and QuickArrows.

Draw and annotate planar objects with Approach and Go lines:

With Approach and Go Lines, you can quickly add lines to represent limits or measurements of your drawings. With this feature, you’ll find it much easier to annotate objects on a 2-D surface, such as a table or drawing board. (video: 1:15 min.)

Create dynamic polyline blocks:

Create Polyline Blocks with the new dynamic feature, so they automatically respond to changes to your drawing. Draw Polyline Blocks and move them around your drawing. (video: 1:15 min.)

Create custom dialog box, ribbon buttons, shortcut keys, and menu items:

You can now easily create custom dialog boxes, ribbon buttons, shortcut keys and menu items. You can add and edit these items using the new Customize tab of the Options dialog box.

Explore custom mouse and keyboard shortcuts:

With the new Explore custom mouse and keyboard shortcuts feature, you can quickly

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