Help with interpolation function

I have set a monotonic function as an array as the following, with x values in the first column and y in the second;

CDF_array =

   -4.0000         0
   -3.0000    0.1000
   -1.0000    0.4000
    1.0000    0.6000
    3.0000    0.9000
    4.0000    1.0000

How do I interpolate to find the x-values at y=0.05, y=0.15 and y=0.63?

Answer 1

[Star Strider]

With:

CDF = [   -4.0000         0
   -3.0000    0.1000
   -1.0000    0.4000
    1.0000    0.6000
    3.0000    0.9000
    4.0000    1.0000];

this statement:

xi = interp1(CDF(:,2), CDF(:,1), [0.05;  0.15;  0.63])

produces:

xi =

      -3.5000e+000
      -2.6667e+000
       1.2000e+000

Answer 2

[the cyclist]

CDF_array = ...
   [-4    0.0;
    -3    0.1;
    -1    0.4;
     1    0.6;
     3    0.9;
     4    1.0];

   y_interp = [0.05 0.15 0.63];

   x_interp = interp1(CDF_array(:,2),CDF_array(:,1),y_interp)