So here is what I did for the stairs graph:
// we are going to make a stair step graphing program in scilab
// o------o
// o--o | |
// | | o---o
// o----o
//
// We take the vector (x1,x2,x3,...,xn) and (y1,y2,y3,...,yn) and instead of
// graphing a lines from the data points (x1,y1) to (x2,y2), (x2,y2) to
(x3,y3),
// etc., we graph (x1,y1) to (x2,y1) then (x2,y1) to (x2,y2), etc.
//
// the number of graphed points goes from n to 2n-1.
// (x1,x2,...,xn)
// (y1,y2,...,yn) goes to
// (x1,x2,x2,x3,x3,x4,x4,...)
// (y1,y1,y2,y2,y3,y3,y4,...)
function stairs(x,y)
n=length(x);
x_indices=int((1:2*n-1)/2)+1; // gives 1,2,2,3,3,...,2n-1,2n-1
x_ss=x(x_indices); // the stair step graph's x values
y_indices=int((2:2*n)/2); // gives 1,1,2,2,...,2n-2,2n-2,2n-1
y_ss=y(y_indices)
plot2d(x_ss,y_ss)
endfunction
// We create an example:
n=10;
x=linspace(0,2,n);
x=x.*x; //irregularly spaced x interval points from 0 to 4
y=sin(x*%pi);
stairs(x,y)
--
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