Hi. I've made some modifications so that that all arrays are now written with gzip compression in the Matlab file. For the chucksize I use the complete array size, so modifiy it here if you have huge arrays. Also it is not a good idea to save 0 byte sized fields (like empty strings, arrays or so). Usage is the same as the orginal matlab_write example. The attached VI works from LabView 2019 and upwards. BR Marcus