How to Call my data and send it to Serial?

It still about CSVIMPORT and my data. I imported 1000 data, that contains 1000 rows and 2 columns (1 column for time, and 1 column for voltage). I save my data in .mat files type, and I divide my data into several .mat type (0.mat, 1.mat, 2.mat, etc.) I want to ask, how I can send my data (voltage) which I called with CSVIMPORT and send it to serial?? I want to send my voltage data (column 2) to microcontroller that appropriate when the onset of the voltage (column 1). What I know is when we want to send data to serial, we using it:

s1 = serial(‘COM1′);

set(s1,’BaudRate’,9600,’DataBits’,8,’StopBits’,1,’InputBufferSize’,16000)

fopen(s1)

fprintf(s1,’???’);

But what code must I fill in '???' mark to get my data??

Thanks for your attention.