A point in a vector?

[Corrado]

Dear list,

I have a strange requirement .... I have a vector, for example 

v=[0,0,0,0,1,2,4,6,8,8,8,8]. I have a value,for example x=4.8. 

I would like to understand in which sub interval of v is x. 

In this case, v would be in the sub interval [4,6] that is in the subinterval 
starting from element j=7 to the element j+1=8.

Can we do that with an octave command?

Regards
-- 
Corrado Topi

Global Climate Change & Biodiversity Indicators
Area 18,Department of Biology
University of York, York, YO10 5YW, UK
Phone: + 44 (0) 1904 328645, E-mail: address@hidden