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# Sgrayplot

smooth 2D plot of a surface using colors

### Syntax

Sgrayplot(x,y,z,<opt_args>) Sgrayplot(x,y,z [,strf, rect, nax, zminmax, colminmax, mesh, colout])

### Arguments

- x,y
real row vectors of size n1 and n2.

- z
real matrix of size (n1,n2).

`z(i,j)`

is the value of the surface at the point (x(i),y(j)).- <opt_args>
This represents a sequence of statements

`key1=value1,key2=value2`

,... where`key1`

,`key2,...`

can be one of the following: strf, rect, nax, zminmax, colminmax, mesh, colout.- strf
is a string of length 3

`"xyz"`

(by default`strf= "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 arg

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

- y=3
built for an isometric scale from the rect arg

- 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 arg

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

- y=7
like y=1 but the previous plot(s) are redrawn to use the new scale

- y=8
like y=2 but the previous plot(s) 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 tics 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 tics.

- 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.- zminmax, colminmax, mesh, colout
See fec.

### Description

`Sgrayplot`

is the same as `grayplot`

but the
plot is smoothed. The function `fec`

is used for smoothing. The
surface is plotted assuming that it is linear on a set of triangles built
from the grid (here with n1=5, n2=3):

The function colorbar may be used to see the color scale.

The parameter `zminmax`

is useful for animation purpose (see an
example after) and the parameter `colminmax`

lets the user choose a part
of the current colormap (see the fec help page).

Enter the command `Sgrayplot()`

to see a demo.

### Examples

// example #1 x=-10:10; y=-10:10;m =rand(21,21); clf() gcf().color_map = hotcolormap(64); Sgrayplot(x,y,m, strf="011", rect=[-20,-20,20,20])

// example #2 t=-%pi:0.1:%pi; m=sin(t)'*cos(t); clf() gcf().color_map = jetcolormap(64); colorbar(-1,1) Sgrayplot(t,t,m, strf="041")

// example #3: an animation display cos(t)*sin(x)sin(y). n = 30; nt = 100; x = linspace(0,2*%pi,n); y = linspace(0,%pi,n/2); z = sin(x')*sin(y); t = linspace(0,4*%pi,nt); show_window(); clf() f=gcf(); f.color_map=jetcolormap(64); colorbar(-1,1) Sgrayplot(x,y,cos(t(1))*z, strf="042", zminmax=[-1,1]) c=gce(),e=c.children xtitle("Kaa''s eyes") for i = 1:nt e.data(:,3)=matrix(cos(t(i))*z,-1,1); end

### See also

- fec — pseudo-color plot of a function defined on a mesh
- fgrayplot — 2D plot of a surface defined by a function using colors
- grayplot — 2D plot of a surface using colors
- Sfgrayplot — smooth 2D plot of a surface defined by a function using colors
- colorbar — draws a vertical color bar

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