# Graphics: Getting started

graphics library overview

### 2d plotting

- plot2d
Plot a curve

**Example:**- plot2d2
Plot a curve as step function

**Example:**- plot2d3
Plot a curve with vertical bars

**Example:**- plot2d4
Plot a curve with arrows

**Example:**- champ
2D vector field

**Example:**- fchamp
Direction field of a 2D first order ODE

**Example:**- contour2d
Level curves of a surface on a 2D plot

- grayplot
2D plot of a surface using colors

**Example:**- fgrayplot
2D plot of a surface defined by a function using colors

**Example:**- Sgrayplot
Smooth 2D plot of a surface using colors

**Example:**- Sfgrayplot
Smooth 2D plot of a surface defined by a function using colors

**Example:**- xgrid
Add a grid on a 2D plot

**Example:**- errbar
Add vertical error bars on a 2D plot

**Example:**- histplot
Plot a histogram

**Example:**- Matplot
2D plot of a matrix using colors

**Example:**

### 3d plotting

- plot3d
Plot a surface

**Example:**- plot3d1
Plot a surface with gray or color level

**Example:**- fplot3d
Plot a surface defined by a function

**Example:**- fplot3d1
Plot a surface defined by a function with gray or color level

**Example:**- param3d
Plot one curve

**Example:**- param3d1
Plots curves

**Example:**- contour
Level curves on a 3D surface

**Example:**- bar3d
3D representation of a bar diagram

**Example:**- genfac3d
Compute facets of a 3D surface

**Example:**- eval3dp
Compute facets of a 3D surface

**Example:**- geom3d
Projection from 3D on 2D after a 3D plot

**Example:**

### Line and polygon plotting

### Rectangle plotting

### Arc plotting

### Arrow plotting

- xarrows
Draw a set of arrows

### Strings

### Frames and axes

### Coordinates transformations

### Colors

- colormap
Using colormaps

- getcolor
Dialog to select colors in the current colormap

- addcolor
Add new colors to the current colormap

- graycolormap
Linear gray colormap

- hotcolormap
Red to yellow colormap

### Graphics context

### Save and load

- xsave
Save graphics into a file

- xload
Load a saved graphics

- xs2bmp
Export graphics using the BMP format

- xs2emf
Export graphics using the EMF format

Only under Windows.- xs2eps
Export graphics using the EPS format

- xs2gif
Export graphics using the GIF format

- xs2jpg
Export graphics using the JPG format

- xs2pdf
Export graphics using the PDF format

- xs2png
Export graphics using the PNG format

- xs2ppm
Export graphics using the PPM format

- xs2ps
Export graphics using the PS format

- xs2svg
Export graphics using the SVG format

### Graphics primitives

- clf
Clear or reset the current graphic figure (window) to default values

- driver
Select a graphics driver

- xinit
Initialisation of a graphics driver

- xend
Close a graphics session

- replot
Redraw the current graphics window with new boundaries

- show_window
Raise the current graphics window

- close
Close some graphic windows

- winsid
Return the list of graphics windows

### Mouse position

### Interactive editor

- edit_curv
Interactive graphics curve editor

### Graphics functions for automatic control

- bode
Bode plot

**Example:**- gainplot
Magnitude plot

**Example:**- nyquist
Nyquist plot

**Example:**- hallchart
Hall chart

**Example:**- nicholschart
Nichols chart

**Example:**- black
Black's diagram

**Example:**- evans
Evans root locus

**Example:**- sgrid
s-plane grid lines

**Example:**- plzr
pole-zero plot

**Example:**- zgrid
zgrid plot

**Example:**

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