I want to use (or simulate an array of arrays). I got a set of images, represented by 2D arrays, that I want to put in an array such that it can be used in a loop. I try to simulate this with a 3D array, but I not sure about syntax (in fact, what a wrote did not work...) : imgArray=FINDGEN(nbImages,width,height) ;in a loop (where img is a 2D array) DRVtab[i]=img ;later, in another loop img=DRVtab(i,*,*) When I try to acces to an element of img, I get an "out of range" error. What is wrong ?