make a point varies

how to generate three points on matlab, where the middle one varies?

[Rik]

You probably need the rand function, but with this little detail it is hard to give a specific example.

[Al Rico]

I function that shoud draw lines between these tree points, the side points are fixed, to point on the middle moves by Y axis so the function will draw multple lines from one point A(first point) to multiple points(or a point that varies) found in the same Y axis that join them in one third point B,

Answer 1

[Walter Roberson]

When A and B are the lower bound and upper bound respectively, then

A + rand() * (B-A)

will be a random point between the two.

This should not return A or B exactly as outputs in normal operation, but could do so in the extreme case that A and B are in the range eps(realmin) to eps(realmin)*2^52 (2.2250738585072e-308)