How do I convert a dataset to a numeric column vector?

So I have been given a dataset to analyse in Matlab where I have to check the confidence intervals of means using the fitdist function. So I did >> x = [sample1] (which is the name of the dataset) and then >>r = fitdist(x,'normal') to try and generate confidence intervals but it says "Error using fitdist, X must be a numeric column vector". Therfore im curious how I can turn my dataset into a 100,2 numeric column vector.

[Image Analyst]

Exactly what class is sample1? What does this show

>> whos sample1