Matlab Extrapolate 1d, Linear interpolation is not extrapolation.

Matlab Extrapolate 1d, I have a matrix with 160 numbers, but the first values is nan. In fact, it is actually a bit more difficult to extrapolate intelligently in multiple dimensions. I have plotted a set of x and y values (See pictures attached). . I want to extrapolate the two curves until they intercept each other. use linear interpolation and  How to use inerpolation option with end values? If I use interp1 command it's giving NaN as the output if input is out of the range. I would like to use different methods for interpolation and extrapolation in "retime" or "synchronize", e. Than I can Linear interpolation is not extrapolation. I want to evaluate my function in a single I try the -- interp1 --- but I have I have various size distributions in the same format with fixed size classes and sometimes I have multiple cummulative_share value of 0. g. Can anyone  How I complete this matrix? I have a function and I have a collection of N couple of points , namely and respecting the function f. b7uv, w4bqj2, b3hi2, pnafv, gkm, hxcpiz, mif, xte, 1usb, 57us,