sub-multiplier of a difference

As part of a University project, I have to program a function that gives me a number that is "the sub-multiplier of y2(xi)-y1(xi) closest to h, while stil beeing inferior or equal to h"

I have y2(xi), y1(xi) and h, but I have no idea how to program this opération. Any help?

[Miro]

check out FMINSEARCH

[Karel]

It doesn't help me: I need an answer clsoe to a numerical valor, and fminsearch will only give me the lowest possible answer

[Muruganandham Subramanian]

Hi,

check this link

http://www.mathworks.com/matlabcentral/fileexchange/15088-search-closest-value-in-a-vector

[Karel]

Thank you, that's part of the solution I need. But how do i create a vector of sub-multipliers?