xaxis

Scilab Function
Last update : April 1993

xaxis - draw an axis

### Calling Sequence

  `xaxis(alpha,nsteps,size,init)`

### Parameters

- `alpha`: real, slope in degree of the axis.
- `nsteps`: real vector of size 2, number of big and small intervals.
- `size`: real vector of size 3, size of the small intervals, and small and big tics.
- `init`: real vector of size 2, origin of the axis.

### Description

`xaxis` draws an axis.

The direction of the axis is given by `alpha` in degree.

`init=[x0 y0]` is the initial point of the axis.

`nsteps=[n1,n2]` gives the number of big and small intervals separated by tics.

`size=[s1,s2,c1]` where `s1` gives the size of the small intervals, `s2` gives the size of the small tics along the axis and `s2*c1` gives the size of the big tics. All the sizes are given using the current x-scale and y-scale and are given as dimensions along the drawn axis.

                example : n1=3, n2=2, alpha=0
                        (s2*c1)
                |     (s2)   |            |           |
                |______|_____|_____|______|_____|_____|
                   s1

### Examples

    x=[-%pi:0.1:%pi]';
    // plot without axis
    plot2d(x,sin(x),1,"010"," ",[-4 -1 4 1])
    // draw x axis
    xpoly([-4 4],[0 0],"lines")
    xaxis(0,[2 2],[2 0.1 3],[-4 0])
    xstring(-4.1,-0.25,"-4"); xstring(-0.2,-0.1,"0"); xstring(4,-0.25,"4")
    // draw y axis
    xpoly([0 0],[-1 1],"lines")
    xaxis(90,[2 2],[0.5 0.025 3],[0 1])
    xstring(-0.5,-1.05,"-1"); xstring(-0.35,0.95,"1")

### Author

J.Ph.C.