What type of text file?
Genearlly, you would use fseek to get to the starting point you want, and fgetl to read in your data line by line. However, fseek requires you to specify the number of bytes to move.
You could use textscan, which allows you to specify the number of headerlines. If the format of your numeric data is the same on each line, you could also specify how many times to apply the specified format spec (number of lines to read in).