How to implement the function bootstrp to obtain a plot of the power regarding the number of observations of a statistical test

Hi,

I am doing experiments on human subjects where they have to perform a piloting task. Their performance is rated by measuring the distance between their trajectory and the center of targets in the sky. I have 8 subjects for the test condition and 8 subjects for the control condition. My data are non-parametric and independent. I am analyzing the statistical difference with a Wilcoxon Rank Sum test in Matlab (ranksum). However, I would like to know what is the power of my test and how many subjects I would need to have a given power. As my data don’t follow a normal distribution (non-parametric), I cannot use the Matlab function sampsizepwr. I found in some studies that we could do a bootstrap analysis to obtain a plot of the power regarding to the number of subjects. Matlab has the function bootstrap but I don't understand how to implement it. Does anyone know how to use bootstrap with Matlab to compute the power as a function of the sample size for non-parametric and independent data?

Thank you for your help!

Carine