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# Matplot

2D plot of a matrix using colors

### Syntax

Matplot(a, [strf, rect, nax]) Matplot(a, <opt_args>)

### Arguments

- a
a real matrix of size (

`n1`

,`n2`

).- <opt_args>
this represents a sequence of statements

`key1=value1, key2=value2, ...`

where`key1`

,`key2`

, ... can be one of the following:- rect
sets the bounds of the plot. If this key is given and neither

`frameflag`

nor`strf`

is given then the`y`

character of`strf`

is supposed to be`7`

. See below for value.- nax
sets the grids definition. If this key is given and neither

`axesflag`

nor`strf`

is given then the`z`

character of`strf`

is supposed to be`1`

. See below for value.- frameflag
specifies how the frame of the plot is computed. The value is an integer ranging from

`0`

to`8`

. It corresponds to the`y`

character of`strf`

. See below.- axesflag
specifies what kind of axes are drawn around the plot. The value is an integer ranging from

`0`

to`5`

. It corresponds to the`z`

character of`strf`

. See below.

- strf
is a string of length 3

`"xyz"`

.- default
the default is

`"081"`

.- x
controls the display of captions.

- x=0
no caption.

- x=1
captions are displayed. They are given by the optional argument

`leg`

.

- y
controls the computation of the actual coordinate ranges from the minimal requested values. Actual ranges can be larger than minimal requirements.

- y=0
no computation, the plot use the previous (or default) scale.

- y=1
from the

`rect`

argument.- y=2
from the min/max of the x, y data.

- y=3
built for an isometric scale from the

`rect`

argument.- y=4
built for an isometric plot from the min/max of the x, y data.

- y=5
enlarged for pretty axes from the

`rect`

argument.- y=6
enlarged for pretty axes from the min/max of the x, y data.

- y=7
like

`y=1`

but the previous plots are redrawn to use the new scale.- y=8
like

`y=2`

but the previous plots are redrawn to use the new scale.

- z
controls the display of information on the frame around the plot. If axes are requested, the number of ticks can be specified by the

`nax`

optional argument.- z=0
nothing is drawn around the plot.

- z=1
axes are drawn, the y-axis is displayed on the left.

- z=2
the plot is surrounded by a box without ticks.

- z=3
axes are drawn, the y-axis is displayed on the right.

- z=4
axes are drawn centred in the middle of the frame box, with the box disabled.

- z=5
axes are drawn centred in the middle of the frame box, with the box enabled.

- rect
This argument is used when the second character

`y`

of argument`strf`

is`1`

,`3`

or`5`

. It is a row vector of size 4 and gives the dimension of the frame:`rect = [xmin, ymin, xmax, ymax]`

.- nax
This argument is used when the third character

`z`

of argument`strf`

is`1`

. It is a row vector with four entries`[nx, Nx, ny, Ny]`

where`nx`

(`ny`

) is the number of subgraduations on the x (y) axis and`Nx`

(`Ny`

) is the number of graduations on the x (y) axis.

### Description

The entries of matrix `int(a)`

are used as colormap entries
in the current colormap. The color associated to `a(i,j)`

is used to draw a small square of size 1 with center at location
`(x=j, y=(n1-i+1))`

.
If a matrix entry is outside the colormap, the corresponding rectangle is not displayed.

To update the Matplot data, the `data` field of the corresponding handle must be used. |

`data`

can be a matrix (or an hypermatrix) containing RGB, RGBA, ... data (see Matplot_properties).
Enter the command `Matplot()`

to see a demo.

### Examples

Matplot([1 2 3;4 5 6])

### See also

- colormap — using colormaps
- plot2d — 2D plot
- Matplot1 — 2D plot of a matrix using colors
- Matplot_properties — Description of the Matplot entities properties

### History

Version | Description |

5.5.0 | `data` can now be a matrix (or an hypermatrix) containing RGB, RGBA, ... data (see Matplot_properties). |

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