I want to calculate the density/mass in a region as a function of time, I used the adjacent commands and I get an error for the fix ave/time even though I wrote as in the documentation.
compute 1 CH chunk/atom bin/3d x 0 80.36 y 0 80.36 z 14.35 25 units reduced
fix 1 CH ave/chunk 1 1000 1000 1 density/mass ave running file densities.txt
fix 5 CH ave/time 1 1000 1000 f_1 den.txt
Could you please help me?