Matplot

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, 5 or 7. 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.

h

This optional output contains a handle to a Matplot entity. For a list of properties, see Matplot_properties.

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.

Enter the command Matplot() to see a demo.

Examples

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

clf()
// draw the current colormap
nbcol = size(gcf().color_map, 1);
Matplot(1:nbcol)

See also

• colormap — set and/or get a figure colormap.
• plot2d — 2D plot
• Matplot1 — 2D plot of a matrix using colors
• Matplot_properties — Description of the Matplot entities properties

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