function cumin( N, x, strideX, y, strideY ) {
	var ix = stride2offset( N, strideX );
	var iy = stride2offset( N, strideY );
	return ndarray( N, x, strideX, ix, y, strideY, iy );
}
Computes the cumulative minimum of a strided array.

@param {PositiveInteger} N - number of indexed elements
@param {NumericArray} x - input array
@param {integer} strideX - `x` stride length
@param {NumericArray} y - output array
@param {integer} strideY - `y` stride length
@returns {NumericArray} output array

@example
var x = [ 1.0, -2.0, 2.0 ];
var y = [ 0.0, 0.0, 0.0 ];
var N = x.length;

var v = cumin( N, x, 1, y, 1 );
// returns [ 1.0, -2.0, -2.0 ]