Bootstrap CI for proportions

I have a simple dataset with values and absolute frequencies, like the table below:

    value|freq
    -----------
    1    |  10  
    3    |  20  
    4    |  10  
    3    |  10
And now I'd like to calculate the frequency table, like:

    value|  %
    -----------
    1    |  1/5  
    3    |  3/5  
    4    |  1/5

And last step, I'd like to compute the *bootstrap CI* with matlab. I have a lot of rows in the dataset.

I've calculated the frequency table via `grpstats`command in Matlab, but I don't know how I can use it in the `boostrp` function in matlab.

Any help or suggestions would be really appreciated.