colorbar

Scilab Function
Last update : 15/04/2005

colorbar - draw a colorbar

### Calling Sequence

  `colorbar(umin, umax [, colminmax])`

### Parameters

- `umin` : real scalar, the minimum value associated with the plot
- `umax` : real scalar, the maximum value associated with the plot
- `colminmax` : (optional) a vector with 2 integer components

### Description

Draw a colorbar for a plot3d, fec, Sgrayplot, etc... The function may be called BEFORE the plot3d, fec, Sgrayplot,... because its sets and changes the frame for the plot. This way the colorbar is not part of the associated plot and so is not modified by a zoom or a rotation.

The optional argument `colminmax` may be used to precise the first color (associated with umin) and the the last color (associated with umax) of the current colormap. By default `colminmax=[1 nb_colors]` where nb_colors is the number of colors of the current colormap.

### Examples

    // example 1
    x = linspace(0,1,81);
    z = cos(2*%pi*x)'*sin(2*%pi*x);
    zm = min(z); zM = max(z);
    xbasc()
    xset("colormap",jetcolormap(64))
    colorbar(zm,zM)
    Sgrayplot(x,x,z)
    xtitle("The function cos(2 pi x)sin(2 pi y)")

    // example 2
    x = linspace(0,1,81);
    z = cos(2*%pi*x)'*sin(2*%pi*x);
    zm = min(z); zM = max(z);
    zz = abs(0.5*cos(2*%pi*x)'*cos(2*%pi*x));
    zzm = min(zz); zzM = max(zz);
    xbasc();
    xset("colormap",jetcolormap(64))
    new_styl = get("figure_style") == "new";
    if new_styl then, drawlater(), end
    subplot(2,2,1)
       colorbar(zm,zM)
       Sgrayplot(x,x,z, strf="031", rect=[0 0 1 1])
       xtitle("a Sgrayplot with a colorbar")
    subplot(2,2,2)
       colorbar(zm,zM)
       plot3d1(x,x,z)
       xtitle("a plot3d1 with a colorbar")
    subplot(2,2,3)
       colorbar(zzm,zzM)
       plot3d1(x,x,zz)
       xtitle("a plot3d1 with a colorbar")
    subplot(2,2,4)
       colorbar(zzm,zzM)
       Sgrayplot(x,x,zz, strf="031", rect=[0 0 1 1])
       xtitle("a Sgrayplot with a colorbar")
    if new_styl then, drawnow(), end

    // example 3
    x = linspace(0,1,81);
    zz = abs(0.5*cos(2*%pi*x)'*cos(2*%pi*x));
    zzm = min(zz); zzM = max(zz);
    [xf,yf,zf]=genfac3d(x,x,zz);
    nb_col = 64;
    xbasc()
    xset("colormap",hotcolormap(nb_col))
    new_styl = get("figure_style") == "new";
    if new_styl then, drawlater(), end
    colorbar(zzm,zzM)
    nbcol = xget("lastpattern")
    zcol = dsearch(zf, linspace(zzm, zzM, nb_col+1));
    plot3d(xf, yf, list(zf, zcol), flag = [-2 6 4])
    xtitle("a plot3d with shaded interpolated colors")
    if new_styl then, drawnow(), end
    xselect()

### See Also

`colormap` ,

### Author

B. Pincon