xlswrite overwriting issue!!

Hi everyone,

I've created an automated detection image processing code, but have run into some trouble when attempting to export the data. I'm using xlswrite and running on a mac, so the data just outputs to a CSV file (which is totally fine). My function runs a loop in order to analyze a number of images in a row, however, after each image is completed, the corresponding data overwrites the previous data from the previous image. Is there a way to simply append the data from each new image onto the previous dataset? (I.E. A single column where the new data simply appends to the next empty row in the column until the loop ends). Running MATLAB2015b (MAC).

My current writing method looks like this (and is all nested within the image reading loop);

filename = 'filename.xlsx'; xlswrite(filename, DATA)