function dist=distancex1y1x2y2 dist=sqrtx1-x2^2+y1-y2^2; end

This is a MATLAB function that calculates the distance between two points in two-dimensional space. The function takes four input arguments: the x-coordinate and y-coordinate of the first point (x1, y1), and the x-coordinate and y-coordinate of the second point (x2, y2). The output of the function is the distance between the two points, calculated using the distance formula:

distance = sqrt((x1 - x2)^2 + (y1 - y2)^2)

The function uses the built-in MATLAB function sqrt() to calculate the square root of the sum of squares of the differences in x-coordinates and y-coordinates.